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Question 3681Question →

Consider the following statements regarding human cardiac physiology and blood circulation:

1. The Sinoatrial (SA) node functions as the primary pacemaker of the heart because it generates impulse discharges at the highest intrinsic frequency.
2. The Atrioventricular (AV) node introduces a slight physiological delay in signal transmission, ensuring atria contract completely before ventricular systole begins.
3. The coronary sinus collects deoxygenated blood from the myocardium and empties directly into the left atrium.

Which of the statements given above are correct?

Show answer & explanation

Answer: 1 and 2 only

Answer

1 and 2 only
Statements 1 and 2 accurately describe cardiac physiology. The Sinoatrial (SA) node acts as the natural pacemaker because it generates action potentials at the highest frequency. The Atrioventricular (AV) node introduces a essential physiological delay (~0.1 s) to allow the ventricles to fill completely before contracting. Statement 3 is incorrect because the coronary sinus drains deoxygenated blood from the heart wall into the right atrium, not the left atrium.

Step-by-Step Solution

1
Evaluate Statement 1 regarding cardiac pacemaking.
Statement 1 is correct. Located in the right atrium, the SA node exhibits the highest rhythmicity (70-80 impulses per minute) and paces the heart.
The intrinsic depolarization rate of the SA node overrides slower secondary pacemakers in the conduction system.
2
Evaluate Statement 2 regarding conduction delay at the AV node.
Statement 2 is correct. Impulse propagation slows down significantly (approx. 0.1 second delay) at the AV node.
This delay ensures complete atrial emptying and optimal ventricular filling prior to ventricular contraction.
3
Evaluate Statement 3 regarding myocardial venous drainage.
Statement 3 is incorrect. The coronary sinus collects deoxygenated blood from the cardiac veins and opens into the right atrium.
All systemic deoxygenated venous return, including coronary venous drainage, enters the right atrium, while the left atrium exclusively receives oxygenated blood from the lungs.

Key Concept

Cardiac Conduction System and Coronary Circulation
Question 3682Question →

Regarding human infectious diseases, their causative pathogens, and primary modes of transmission, which of the following statements are correct?

Select all that apply

Show answer & explanation

Answer: Tuberculosis is a bacterial disease caused by Mycobacterium tuberculosis, primarily affecting the lungs.; Malaria is a protozoan disease caused by Plasmodium species, transmitted through female Anopheles mosquito bites.; Athlete's foot is a fungal infection of the skin commonly caused by dermatophytes.

Answer

The correct statements are those identifying Tuberculosis as a bacterial infection of the lungs, Malaria as a protozoan infection transmitted by female Anopheles mosquitoes, and Athlete's foot as a fungal skin infection caused by dermatophytes.
The correct options accurately pair infectious diseases with their true pathogen categories and transmission routes: Tuberculosis is bacterial (Mycobacterium tuberculosis), Malaria is protozoan (Plasmodium spp.) transmitted by female Anopheles mosquitoes, and Athlete's foot is a fungal infection (dermatophytes).

Step-by-Step Solution

1
Evaluate the pathogen and organ targeting for Tuberculosis
Tuberculosis is correctly identified as a bacterial infection caused by Mycobacterium tuberculosis.
Mycobacterium tuberculosis is a bacterium that primarily causes pulmonary disease.
2
Evaluate the causative agent and vector for Malaria
Malaria is correctly identified as a protozoan disease transmitted by female Anopheles mosquitoes.
Plasmodium is a protozoan parasite, and female Anopheles mosquitoes serve as the biological vector.
3
Analyze the etiology and transmission route of Typhoid fever
The statement describing Typhoid fever as a respiratory virus is incorrect.
Typhoid fever is caused by the bacterium Salmonella typhi and is spread through the fecal-oral route (contaminated food/water), not airborne viruses.
4
Assess the biological nature of Athlete's foot
Athlete's foot is correctly recognized as a fungal infection.
Tinea pedis is caused by dermatophytes, a group of parasitic fungi.

Key Concept

Classification of human diseases by biological pathogen type (bacterium, protozoan, fungus, virus) and transmission pathway.
Question 3683Question →

Which of the following environmental legislations in India is commonly referred to as the 'Umbrella Legislation' for providing a comprehensive statutory framework for environmental protection?

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Answer: Environment (Protection) Act, 1986

Answer

Environment (Protection) Act, 1986
The Environment (Protection) Act, 1986 is known as the 'Umbrella Legislation' because it creates an overarching administrative and legislative framework to coordinate activities under existing single-medium environmental laws, such as the Water Act 1974 and Air Act 1981.

Step-by-Step Solution

1
Identify the scope of the Environment (Protection) Act, 1986.
It covers water, air, soil, and noise pollution under a single statutory umbrella.
Earlier laws (Water Act 1974 and Air Act 1981) were domain-specific and lacked comprehensive coverage.
2
Relate the designated name 'Umbrella Legislation' to Indian environmental law.
The 1986 Act is specifically termed umbrella legislation because it bridges regulatory gaps and empowers the central government to coordinate state and central pollution authorities.
Enacted under Article 253 of the Constitution of India to implement decisions made at the 1972 United Nations Conference on the Human Environment.

Key Concept

Environment (Protection) Act, 1986 as Umbrella Legislation
Question 3684Question →

Regarding specialized environmental monitoring, enforcement, and eco-restoration institutions operating under the Ministry of Environment, Forest and Climate Change (MoEFCC) in India, which of the following statements are correct?

Select all that apply

Show answer & explanation

Answer: The Wildlife Crime Control Bureau (WCCB) is a statutory multi-disciplinary body constituted under the Wildlife (Protection) Act, 1972, to combat organized wildlife crime.; The National Afforestation and Eco-Development Board (NAEB) focuses specifically on the regeneration of degraded forest areas and eco-restoration of adjoining lands.

Answer

The correct statements are the one describing the Wildlife Crime Control Bureau as a statutory body under the Wildlife (Protection) Act, 1972, and the one identifying the mandate of the National Afforestation and Eco-Development Board regarding degraded forest land restoration.
The Wildlife Crime Control Bureau (WCCB) is indeed a statutory body under Section 50Y of the Wildlife (Protection) Act, 1972. The National Afforestation and Eco-Development Board (NAEB), set up in 1992, specifically works to restore degraded forest lands and eco-sensitive areas.

Step-by-Step Solution

1
Analyze the legal status of the Wildlife Crime Control Bureau (WCCB).
WCCB was constituted under Section 50Y of the Wildlife (Protection) Act, 1972, making it a statutory multi-disciplinary intelligence and enforcement body.
Verifying statutory authorization under national wildlife protection legislation.
2
Evaluate the administrative nature of the Forest Survey of India (FSI).
FSI originated from the Pre-Investment Survey of Forest Resources (PISFR) and functions as an attached subordinate office of MoEFCC. It is not a statutory body under the Forest (Conservation) Act, 1980.
Distinguishing executive subordinate agencies from statutory bodies enacted by parliamentary statutes.
3
Assess the institutional mandate of the National Afforestation and Eco-Development Board (NAEB).
NAEB was established in 1992 specifically to promote eco-restoration and regeneration of degraded forests and eco-sensitive zones.
Confirming core focus areas of environmental development boards in India.
4
Check the organizational structure of SACON.
SACON was formed as an autonomous registered society under the Societies Registration Act, 1860, not as a statutory parliamentary body.
Preventing confusion between registered societies/autonomous institutes and statutory organizations.

Key Concept

Classification, statutory framework, and specific mandates of key Indian environmental organizations (WCCB, FSI, NAEB, SACON).
Question 3685Question →

Consider the following statements regarding Blockchain technology and cryptographic mechanisms in cybersecurity:

1. Cryptographic hash functions used in blockchain exhibit the 'avalanche effect', where a minor modification to input data yields a significantly different hash output.
2. Immutability in a public blockchain ledger is secured because altering historical data requires recalculating the hashes of all subsequent blocks and achieving consensus across the network.
3. Asymmetric cryptography is implemented in blockchain systems primarily for compressing transaction data volume rather than managing digital keys and authentication.

Which of the statements given above are correct?

Show answer & explanation

Answer: 1 and 2 only

Answer

The statement combination '1 and 2 only' is correct.
The combination consisting of the first and second statements is correct. Cryptographic hash functions ensure that any slight modification in input radically alters the output hash (avalanche effect). Furthermore, because blocks are cryptographically chained, modifying any past transaction invalidates all subsequent block headers, making the ledger tamper-resistant. Conversely, asymmetric encryption generates public and private key pairs for wallet identity and digital signatures, not for data compression.

Step-by-Step Solution

1
Analyze Statement 1 regarding cryptographic hash functions.
Statement 1 is correct.
Cryptographic hash functions (such as SHA-256) feature the avalanche effect, meaning even a single bit change in the input produces a drastically altered and unpredictable hash output.
2
Analyze Statement 2 regarding ledger immutability.
Statement 2 is correct.
Each block contains the cryptographic hash of the preceding block. Changing past block data breaks the hash chain, requiring an attacker to recompute all subsequent hashes and override majority network consensus.
3
Analyze Statement 3 regarding asymmetric cryptography.
Statement 3 is incorrect.
Asymmetric cryptography (public-private key pairs) is used for digital signatures, ownership verification, and secure transaction signing, not for data compression.

Key Concept

Cryptographic Hash Functions and Asymmetric Encryption in Blockchain Security
Question 3686Question →

The enactment of the Annual Financial Statement (Budget) in a State Legislature follows a strict constitutional procedure under Articles 202 to 207 of the Constitution of India. What is the correct sequential order of these administrative and legislative stages from first to last?

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Answer

The correct sequential order of budget enactment stages in a State Legislative Assembly is: Presentation of the Budget, followed by General Discussion, Voting on Demands for Grants, Passing of the Appropriation Bill, and finally Passing of the Finance Bill.
Under Articles 202 to 207 of the Constitution of India, the financial procedure in a State Legislative Assembly strictly follows a five-stage sequence: 1. Presentation of the Annual Financial Statement (Article 202), 2. General Discussion without voting, 3. Voting on Demands for Grants (Article 203), 4. Passing of the Appropriation Bill (Article 204) to authorize withdrawal from the Consolidated Fund of the State, and 5. Passing of the Finance Bill to finalize taxation proposals.

Step-by-Step Solution

1
Identify the initial formal step in laying financial estimates before the legislature.
Presentation of the Annual Financial Statement (Budget) by the Finance Minister under Article 202.
No legislative discussion or financial deliberation can occur prior to the formal tabling of the budget estimates in the House.
2
Determine the stage for overall debate preceding detailed grant voting.
General Discussion on the budget as a whole.
This allows members of the Legislative Assembly to debate fiscal policy and principles without voting on specific budget allocations.
3
Identify the phase where departmental expenditure requests are voted upon.
Voting on Demands for Grants under Article 203.
Exclusive to the Legislative Assembly, each demand for grant must be voted upon and approved before funds can be allocated.
4
Determine the stage providing statutory authority to withdraw funds.
Introduction and passing of the Appropriation Bill under Article 204.
Article 204(3) explicitly mandates that no money shall be withdrawn from the Consolidated Fund of the State except under an appropriation law.
5
Identify the final stage giving legal effect to revenue and taxation proposals.
Consideration and passing of the Finance Bill.
The taxation and revenue measures proposed in the budget are legalized through the enactment of the Finance Bill, completing the financial legislative cycle.

Key Concept

Constitutional Procedure for Enactment of State Budget (Articles 202-207)
Question 3687Question →

Match the state government welfare schemes in List-I with their respective implementing states in List-II.

Click a left item, then click its matching right item

Items

KALIA Scheme
Chief Minister's Breakfast Scheme
Mukhyamantri Sikho-Kamao Yojana
Bhagyalakshmi Scheme

Matches

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Answer

The correct matches are: KALIA Scheme corresponds to Odisha, Chief Minister's Breakfast Scheme corresponds to Tamil Nadu, Mukhyamantri Sikho-Kamao Yojana corresponds to Madhya Pradesh, and Bhagyalakshmi Scheme corresponds to Karnataka.
Each scheme accurately corresponds to its implementing state: KALIA Scheme is from Odisha, Chief Minister's Breakfast Scheme is from Tamil Nadu, Mukhyamantri Sikho-Kamao Yojana is from Madhya Pradesh, and Bhagyalakshmi Scheme is from Karnataka.

Step-by-Step Solution

1
Identify the state implementing the KALIA Scheme
KALIA Scheme is implemented by Odisha for agricultural livelihood support.
It is a flagship agricultural welfare program introduced by the Government of Odisha.
2
Identify the state implementing the Chief Minister's Breakfast Scheme
Chief Minister's Breakfast Scheme is implemented by Tamil Nadu.
This scheme focuses on nutrition for primary school students in Tamil Nadu.
3
Match Mukhyamantri Sikho-Kamao Yojana and Bhagyalakshmi Scheme to their respective states
Mukhyamantri Sikho-Kamao Yojana belongs to Madhya Pradesh, while Bhagyalakshmi Scheme belongs to Karnataka.
Sikho-Kamao provides skill-based stipends in Madhya Pradesh, while Bhagyalakshmi supports female child welfare in Karnataka.

Key Concept

State Government Schemes and Welfare Policies
Question 3688Question →

With reference to the structural and functional attributes of ecological systems, evaluate the following assertions:

I. The standing crop of an ecosystem refers to the total amount of inorganic nutrients present in the soil or water column at any given time.
II. In deep aquatic ecosystems, the pyramid of biomass can be inverted because the turnover rate of primary producers is exceptionally high relative to primary consumers.
III. The realised niche of a species is typically broader than its fundamental niche because interspecific competition forces the species to expand its resource utilization.

Which of the assertions given above is/are correct?

Show answer & explanation

Answer: II only

Answer

Only assertion II is correct. The standing crop refers to living organic material (biomass), whereas standing state refers to inorganic nutrients. The realised niche is narrower than the fundamental niche due to competition.
Only the assertion stating that the pyramid of biomass in deep aquatic ecosystems can be inverted due to rapid turnover rates of primary producers is correct. Phytoplankton have high productivity and fast growth cycles, enabling a small standing mass to sustain a larger biomass of consumers. The assertion regarding standing crop is incorrect because standing crop measures living biomass, whereas the inorganic nutrient content is termed standing state. The assertion regarding niche size is incorrect because competition shrinks the fundamental niche down to a smaller realised niche.

Step-by-Step Solution

1
Evaluate Assertion I regarding ecosystem structural terminology.
Assertion I is incorrect.
The total quantity of inorganic nutrients (such as nitrogen, phosphorus, and calcium) present in an ecosystem's soil or water body at any given time is defined as the 'standing state' (or standing quality). In contrast, 'standing crop' represents the living organic matter (biomass) or total number of living organisms in a given area at a specific time.
2
Evaluate Assertion II regarding ecological pyramids in aquatic systems.
Assertion II is correct.
In open ocean and lake ecosystems, primary producers (phytoplankton) reproduce rapidly and have extremely short life cycles. Because of this high turnover rate, a small standing biomass of phytoplankton can support a significantly larger standing biomass of long-lived primary consumers (zooplankton and fish), creating an inverted biomass pyramid.
3
Evaluate Assertion III regarding ecological niche dynamics.
Assertion III is incorrect.
The fundamental niche represents the full theoretical spectrum of environmental conditions and resources a species can exploit in the absence of biotic interactions. Biological constraints—primarily interspecific competition and predation—restrict the species to a narrower actual range known as the realised niche.

Key Concept

Structural terminology of ecosystems (standing crop vs. standing state), inverted pyramids of biomass, and niche theory (fundamental vs. realised niche).
Estimated Time:2m 0s
Question 3689Question →

With reference to biological diversity conservation strategies, consider the following statements:

1. Sacred groves represent an ex-situ conservation mechanism where threatened flora is maintained under controlled laboratory conditions.
2. In-situ conservation permits the continuation of natural evolutionary processes within the native habitat of organisms.
3. Cryopreservation of gametes at ultra-low temperatures functions as an ex-situ preservation method for endangered species.
4. Botanical gardens, biosphere reserves, and national parks are all collectively categorized as in-situ conservation sites.

Which of the statements given above are correct?

Show answer & explanation

Answer: 2 and 3 only

Answer

Statements 2 and 3 are correct.
Statement 2 is correct because in-situ conservation preserves species in their natural habitats, allowing natural selection and evolutionary dynamics to proceed. Statement 3 is correct because cryopreservation stores genetic material at ultra-low temperatures outside natural habitats, placing it firmly in the ex-situ category.

Step-by-Step Solution

1
Evaluate Statement 1 regarding Sacred Groves
Sacred groves are community-protected natural forest fragments preserved on-site through traditional cultural practices. Thus, they are in-situ conservation strategies, making Statement 1 incorrect.
In-situ strategies protect organisms within their natural ecosystems.
2
Evaluate Statement 2 regarding In-situ Conservation features
In-situ conservation protects wild populations within their natural habitats, allowing ecosystem interactions and evolutionary adaptation processes to continue uninterrupted. Statement 2 is correct.
On-site preservation maintains ecological evolutionary dynamics.
3
Evaluate Statement 3 regarding Cryopreservation
Cryopreservation involves storing biological samples (gametes, seeds, tissues) at sub-zero temperatures (e.g., in liquid nitrogen at -196°C) outside their natural environment. Thus, it is an ex-situ strategy, making Statement 3 correct.
Off-site artificial storage under controlled cryogenic conditions defines ex-situ preservation.
4
Evaluate Statement 4 regarding Botanical Gardens, Biosphere Reserves, and National Parks
Biosphere reserves and national parks are in-situ protected areas, whereas botanical gardens are man-made off-site facilities classified under ex-situ conservation. Statement 4 is incorrect.
Botanical gardens do not protect wild habitats in-situ.

Key Concept

Classification of Biodiversity Conservation Strategies into In-situ (on-site) and Ex-situ (off-site) approaches
Question 3690Question →

Kalinga temple architecture represents a distinct regional sub-style of Nagara architecture, which evolved through well-defined structural and stylistic phases over several centuries. Arrange the following iconic state heritage temples of Odisha in chronological order of their construction, starting from the earliest to the latest:

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Answer

The correct chronological sequence of construction is: Parasurameswara Temple (7th century CE), Mukteswara Temple (10th century CE), Lingaraja Temple (11th century CE), and Sun Temple at Konark (13th century CE).
The correct sequence reflects the historical progression of Kalinga temple architecture: Parasurameswara Temple (7th century CE) represents the early phase, Mukteswara Temple (10th century CE) represents the transitional phase, Lingaraja Temple (11th century CE) marks the mature phase, and the Konark Sun Temple (13th century CE) represents the ultimate pinnacle of the style.

Step-by-Step Solution

1
Determine the era of Parasurameswara Temple.
Built c. 7th century CE during the Sailodbhava period.
It represents the early Kalinga style featuring squat deula towers and heavy relief sculptures.
2
Determine the era of Mukteswara Temple.
Built c. late 10th century CE during Somavamshi patronage.
It acts as the bridge/transition between early and mature Kalinga phases, famous for its carved Torana archway.
3
Determine the era of Lingaraja Temple.
Built c. 11th century CE under Somavamshi patronage.
It exemplifies the fully developed, mature Kalinga temple complex with all four functional structures (Deula, Jagamohana, Nata-mandap, and Bhoga-mandap).
4
Determine the era of Konark Sun Temple.
Built c. mid-13th century CE by Eastern Ganga monarch King Narasimhadeva I.
It represents the zenith of state architectural heritage, designed as a massive stone chariot dedicated to the Sun God.

Key Concept

Chronological evolution of regional temple architecture and dynastic cultural heritage.
Question 3691Question →

Arrange the following major peasant and social reform movements in regional state history in correct chronological order from earliest to latest:

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Answer

The correct chronological order from earliest to latest is: Sanyasi-Fakir Rebellion (1763), Indigo Revolt (1859), Pabna Peasant Agrarian League Movement (1873), and Tebhaga Movement (1946).
The historical sequence begins with the Sanyasi-Fakir Rebellion (c. 1763–1800), followed by the Indigo Revolt (1859–1860), then the Pabna Peasant Uprising (1873–1876), and concludes with the Tebhaga Movement (1946–1947).

Step-by-Step Solution

1
Identify the period of the Sanyasi-Fakir Rebellion
The movement originated around 1763 and continued into the late 18th century.
It represents one of the earliest armed resistance movements against East India Company rule in Eastern India.
2
Determine the date of the Indigo Revolt
The revolt broke out in 1859 in Bengal.
Peasants united against oppressive indigo cultivation contracts following the 1857 uprising.
3
Identify the timeframe of the Pabna Peasant Movement
The agrarian league was formed in 1873.
It developed in response to rent enhancements and illegal cesses by local landlords in the 1870s.
4
Determine the date of the Tebhaga Movement
The movement was initiated in 1946.
It took place on the eve of Indian Independence based on the recommendations of the Floud Commission.

Key Concept

Chronology of Regional Peasant and Agrarian Movements
Estimated Time:1m 30s
Question 3692Question →

Assam is the pioneer state in India's petroleum sector, with significant crude oil and natural gas reserves located across the Brahmaputra Valley. Based on their geographical locations in Upper Assam, which of the following represents the correct sequence of these major oil fields arranged from East to West?

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Answer

The correct sequence of Assam's major oil fields from East to West is Digboi Oil Field (Tinsukia district), followed by Naharkatiya Oil Field (Dibrugarh district), Moran-Hugrijan Oil Field (Dibrugarh/Sivasagar boundary), and Rudrasagar Oil Field (Sivasagar district).
The correct geographical alignment from East to West across the petroleum belt of Upper Assam starts with Digboi in Tinsukia district, moves westward to Naharkatiya in Dibrugarh district, continues to Moran-Hugrijan near the Sivasagar border, and ends at Rudrasagar in Sivasagar district.

Step-by-Step Solution

1
Identify the district location and spatial position of each oil field within the Upper Assam oil basin.
Digboi is situated in Tinsukia district; Naharkatiya is in Dibrugarh district; Moran-Hugrijan is on the Dibrugarh-Sivasagar border; Rudrasagar is in Sivasagar district.
Administrative districts in Upper Assam extend geographically from east to west in the order: Tinsukia → Dibrugarh → Sivasagar.
2
Arrange the fields chronologically along their longitudinal position from East to West.
The correct geographical progression from East to West is Digboi → Naharkatiya → Moran-Hugrijan → Rudrasagar.
Digboi (~95.6° E) is the easternmost field, followed by Naharkatiya (~95.3° E), Moran (~94.9° E), and Rudrasagar (~94.6° E).

Key Concept

Geographical and spatial distribution of petroleum natural resources in Assam
Question 3693Question →

Minamata disease, a severe neurological disorder caused by industrial water pollution, is primarily associated with the consumption of seafood contaminated by which of the following heavy metals?

Show answer & explanation

Answer: Mercury

Answer

Mercury
Minamata disease is a neurological syndrome resulting from severe mercury poisoning. It was first discovered in Minamata City, Kumamoto Prefecture, Japan, where industrial wastewater containing methylmercury was discharged into Minamata Bay, contaminating fish and shellfish consumed by the local population.

Step-by-Step Solution

1
Identify the heavy metal pollutant associated with Minamata disease.
Minamata disease is caused by chronic methylmercury poisoning.
Industrial effluents containing inorganic mercury are released into water bodies where bacteria convert them into methylmercury, which bioaccumulates in aquatic food chains.

Key Concept

Heavy Metal Water Pollution and Specific Environmental Diseases
Estimated Time:45s
Question 3694Question →

In ecological structural analysis, biological organization spans multiple hierarchical tiers from single organisms to global ecological systems. Based on the fundamental principles of ecosystem structure, arrange the following levels of ecological organization in ascending order of complexity (from the narrowest structural unit to the broadest ecological boundary):

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Answer

The correct structural sequence in ascending order of ecological complexity is: Individual Organism → Population → Biotic Community → Ecosystem → Landscape → Biome.
The hierarchical structure of ecological systems progresses from the simplest structural unit (the individual organism) to species populations, biological communities, integrated abiotic-biotic ecosystems, spatial landscape mosaics, and macro-climatic biomes.

Step-by-Step Solution

1
Identify the basic biological unit
The Individual Organism represents the single living unit (Trophically/Behaviorally functional entity).
Ecology begins at the organismal level where single individuals absorb resources and respond to stress.
2
Group individuals of the same species
Multiple individuals of the same species occupying a defined space form a Population.
A population introduces emergent properties such as birth rate, death rate, and gene frequency.
3
Combine interacting populations of different species
Multiple interacting populations (plants, animals, microbes) form a Biotic Community (Biocenosis).
Communities focus on interspecific interactions like predation, competition, mutualism, and commensalism.
4
Integrate the physical environment (abiotic factors)
The Biotic Community plus its physical environment (soil, water, atmosphere) forms an Ecosystem.
The ecosystem introduces functional energy flow and nutrient cycling between biotic components and abiotic reservoirs.
5
Scale up to spatial mosaics of distinct ecosystems
A geographic area containing a mosaic of interacting distinct ecosystems constitutes a Landscape.
Landscape ecology studies spatial dynamics and material flow across ecosystem boundaries.
6
Aggregate landscapes under shared macroclimate
Regional geographic divisions with shared dominant vegetation types and regional climate patterns form a Biome.
Biomes encompass multiple landscapes governed by macroclimatic controls such as precipitation and temperature patterns.

Key Concept

Levels of Ecological Hierarchy
Question 3695Question →

Safety matches rely on specific chemical formulations on both the match head and the striking surface to ensure controlled ignition. Which of the following statements regarding the chemical composition and functions of components in safety matches are correct?

Select all that apply

Show answer & explanation

Answer: Potassium chlorate (KClO3KClO_3) is present in the match head to serve as an oxidizing agent that decomposes to supply oxygen during friction.; The striking surface of a safety matchbox contains red phosphorus, which undergoes friction-induced conversion to ignite the match.; Antimony trisulfide (Sb2S3Sb_2S_3) is incorporated into the match head to function as a combustible fuel.

Answer

The correct statements are those identifying potassium chlorate as the oxidizing agent in the match head, red phosphorus on the striking strip as the ignition initiator, and antimony trisulfide as the fuel in the match head.
The statements correctly identify that potassium chlorate acts as an oxidizing agent in the match head, antimony trisulfide functions as the fuel in the head, and red phosphorus on the striking surface initiates combustion via friction-induced heat.

Step-by-Step Solution

1
Analyze the chemical composition of the match head.
The match head contains potassium chlorate (KClO3KClO_3) as an oxidizing agent, antimony trisulfide (Sb2S3Sb_2S_3) as a fuel, and a binder/glue.
Potassium chlorate decomposes to yield oxygen, which rapidly oxidizes antimony trisulfide to sustain the flame.
2
Examine the composition and reaction of the striking surface.
The striking surface contains red phosphorus, powdered glass (an abrasive/friction agent), and adhesive.
Striking generates frictional heat, transforming a minute portion of stable red phosphorus into reactive white phosphorus vapor that ignites.
3
Evaluate the safety hazard associated with white phosphorus.
White phosphorus (P4P_4) is poisonous and ignites spontaneously in air at room temperature.
It was banned internationally under the Berne Convention of 1906 due to severe occupational toxicity ('phossy jaw') and spontaneous combustion hazards.

Key Concept

Chemical Composition and Reaction Dynamics of Safety Matches
Question 3696Question →

Regarding the Pradhan Mantri Suraksha Bima Yojana (PMSBY), a key component of India's social security architecture, which of the following statements are correct?

Select all that apply

Show answer & explanation

Answer: It provides an accidental death and permanent total disability risk cover of ₹2 lakh to the subscriber.; Individuals having a savings bank or post office account in the age group of 18 to 70 years are eligible to join.; The annual premium of ₹20 per subscriber is automatically debited from the subscriber's bank account in a single installment.

Answer

The statements confirming a ₹2 lakh cover for accidental death/total disability, eligibility for bank account holders aged 18 to 70 years, and an auto-debited annual premium of ₹20 are correct. The statement claiming administration under the Ministry of Health and Family Welfare is incorrect.
The correct statements accurately state the features of Pradhan Mantri Suraksha Bima Yojana (PMSBY): it offers ₹2 lakh coverage for accidental death or permanent total disability, targets individuals aged 18 to 70 with bank/post office accounts, and features an annual auto-debit premium of ₹20.

Step-by-Step Solution

1
Examine the risk coverage provisions of PMSBY
Confirm that accidental death and permanent total disability are covered up to ₹2 lakh (and partial permanent disability up to ₹1 lakh).
Risk coverage parameters define the primary benefit structure of the social security scheme.
2
Verify age limits and target beneficiary qualifications
Confirm that subscribers must be between 18 and 70 years old with an active bank/post office account.
Eligibility windows establish the age envelope and financial inclusion prerequisites.
3
Inspect the nodal administrative Ministry and premium details
Identify that the scheme falls under the Department of Financial Services (Ministry of Finance) with a ₹20 annual auto-debit premium, making the health ministry claim false.
Financial social security schemes are managed by the Ministry of Finance, not the health ministry.

Key Concept

Pradhan Mantri Suraksha Bima Yojana (PMSBY) Framework and Eligibility
Question 3697Question →

Arrange the following major international environmental agreements in the chronological order of their adoption, from earliest to latest:

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Answer

The correct chronological order of adoption from earliest to latest is: Vienna Convention (1985) → UNCCD (1994) → Rotterdam Convention (1998) → Minamata Convention (2013).
The treaties were adopted in the following years: Vienna Convention in 1985, United Nations Convention to Combat Desertification (UNCCD) in 1994, Rotterdam Convention in 1998, and Minamata Convention on Mercury in 2013.

Step-by-Step Solution

1
Determine the year of adoption for the Vienna Convention for the Protection of the Ozone Layer.
The Vienna Convention was adopted in 1985.
It established the umbrella framework for ozone protection prior to the Montreal Protocol.
2
Determine the year of adoption for the United Nations Convention to Combat Desertification (UNCCD).
UNCCD was adopted in 1994.
It stemmed directly from the Rio Earth Summit recommendations of 1992 and was formally adopted in Paris in 1994.
3
Determine the year of adoption for the Rotterdam Convention.
The Rotterdam Convention was adopted in 1998.
It established a multilateral procedure regarding hazardous chemicals in global commerce.
4
Determine the year of adoption for the Minamata Convention on Mercury.
The Minamata Convention was adopted in 2013.
It was negotiated under the auspices of UNEP to curb global mercury pollution and adopted in Kumamoto, Japan.
5
Sequence the conventions by adoption year.
Chronological sequence: Vienna Convention (1985), UNCCD (1994), Rotterdam Convention (1998), Minamata Convention (2013).
Placing the years in ascending order yields the sequence 1985, 1994, 1998, 2013.

Key Concept

Chronological adoption sequence of major global environmental treaties and conventions
Question 3698Question →

In the governance system of an Indian state, who presides over the meetings of the State Cabinet?

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Answer: The Chief Minister

Answer

The Chief Minister presides over the meetings of the State Cabinet.
The Chief Minister is the real executive head of the state government and holds the responsibility of presiding over the meetings of the State Cabinet.

Step-by-Step Solution

1
Identify the real executive authority in state polity.
The Chief Minister functions as the political head of the state government and leader of the Council of Ministers.
In the parliamentary form of government at the state level, actual executive decisions are taken by the Council of Ministers led by the Chief Minister.
2
Determine who leads Cabinet proceedings.
The Chief Minister summons, conducts, and presides over Cabinet meetings.
The Chief Minister directs policy decisions, coordinates department functions, and chairs the Cabinet.

Key Concept

Role and Executive Functions of the Chief Minister
Estimated Time:45s
Question 3699Question →

Arrange the following major Indian environmental legislations in chronological order of their enactment, starting from the earliest to the latest:

Drag items to arrange them in the correct order

Show answer & explanation

Answer

The correct chronological order from earliest to latest is: Water (Prevention and Control of Pollution) Act (1974) → Forest (Conservation) Act (1980) → Biological Diversity Act (2002) → National Green Tribunal Act (2010).
The landmark environmental legislations were enacted in the following chronological sequence: the Water (Prevention and Control of Pollution) Act in 1974, the Forest (Conservation) Act in 1980, the Biological Diversity Act in 2002, and the National Green Tribunal Act in 2010.

Step-by-Step Solution

1
Identify the enactment year for each environmental act listed
Water Act: 1974; Forest (Conservation) Act: 1980; Biological Diversity Act: 2002; National Green Tribunal Act: 2010.
Establishing the precise year of enactment is essential to determine chronological sequence.
2
Arrange the acts sequentially by enactment year
1974 (Water Act) comes first, followed by 1980 (Forest Conservation Act), then 2002 (Biological Diversity Act), and finally 2010 (NGT Act).
This establishes the historical timeline of environmental law development in India.

Key Concept

Chronology of Landmark Environmental Acts in India
Question 3700Question →

Regarding the components and operational mechanisms of the Pradhan Mantri Annadata Aay Sanraksan Abhiyan (PM-AASHA) umbrella scheme for agricultural price support in India, which of the following statements are correct?

Select all that apply

Show answer & explanation

Answer: Under the Price Support Scheme (PSS), physical procurement of notified pulses, oilseeds, and copra is undertaken by central nodal agencies with state support.; The Price Deficiency Payment Scheme (PDPS) covers oilseeds and pays registered farmers the difference between MSP and the market price without physical crop procurement.

Answer

The correct statements are those stating that PSS involves physical procurement of notified pulses, oilseeds, and copra by central agencies, and that PDPS provides direct price-difference payments to oilseed farmers without physical crop procurement.
The statements describing physical procurement under PSS by central nodal agencies (like NAFED) for pulses, oilseeds, and copra, as well as direct price-difference compensation under PDPS for oilseeds without physical procurement, accurately depict the provisions of PM-AASHA.

Step-by-Step Solution

1
Analyze the core objective and structure of the PM-AASHA umbrella scheme.
PM-AASHA was approved in 2018 to ensure remunerative prices to farmers for oilseeds, pulses, and copra through three distinct sub-schemes: PSS, PDPS, and PPPS.
Understanding sub-scheme distinctions is essential for evaluating agricultural price intervention policies.
2
Evaluate the operational mechanism of the Price Support Scheme (PSS).
PSS handles physical procurement of pulses, oilseeds, and copra via agencies like NAFED when market prices dip below MSP, making the statement regarding physical procurement correct.
PSS is the traditional physical intervention leg of central price support.
3
Evaluate the mechanism of the Price Deficiency Payment Scheme (PDPS).
PDPS covers oilseeds and compensates farmers directly via bank transfer for the price deficit without taking physical delivery or storing crops, making the direct payout statement correct and the warehousing statement incorrect.
PDPS reduces central storage and handling overheads while insulating farmers against market price crashes.
4
Examine the scope of the Private Procurement and Stockist Scheme (PPPS).
PPPS is piloted exclusively for oilseeds in selected districts to involve private players in MSP protection, not for central pool staples like wheat and rice.
Wheat and rice procurement remains strictly governed by FCI and state procurement agencies for PDS requirements.

Key Concept

PM-AASHA Agricultural Price Protection Architecture
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