All practice questions

Arrange the following stages of allopatric speciation in the correct sequential order from first to last:

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Answer

The correct sequence of allopatric speciation begins with geographic barrier formation, followed by independent genetic divergence in isolation, leading to the development of reproductive isolation mechanisms, and culminating in complete biological speciation upon secondary contact.

Allopatric speciation requires physical geographic isolation to stop gene flow between populations. Over time, independent selective pressures and genetic drift alter gene pools until biological reproductive isolation arises, making interbreeding impossible even if secondary contact occurs.

Step-by-Step Solution

1

Identify the initial event that begins allopatric speciation.

Physical geographic separation occurs first, which cuts off gene flow between subpopulations.

Allopatric speciation is specifically defined by geographical isolation as its triggering mechanism.

2

Determine the genetic consequences while populations are geographically isolated.

Subpopulations independently undergo natural selection, mutations, and genetic drift.

Absence of gene flow permits independent changes in allele frequencies across separate environments.

3

Identify how genetic divergence leads to biological speciation.

Reproductive isolating mechanisms (e.g. mating behavior changes, gamete incompatibility) develop.

Genetic changes eventually affect traits critical for successful mating and fertilization.

4

Determine the outcome if the geographic barrier is removed.

Secondary contact reveals that the two populations can no longer interbreed to produce viable, fertile offspring.

Biological reproductive isolation confirms that distinct species have formed.

Key Concept

Stages of allopatric speciation and reproductive isolation mechanisms

Estimated Time:1m 30s

Question 4902Question →

A commercial footwear manufacturing enterprise organizes its factory floor around a highly specialized division of labor. Arrange the following production sub-processes in their correct logical sequence, from initial raw material preparation to final product output.

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Answer

The correct sequence starts with cutting raw leather sheets into patterns, followed by stitching upper components together, lasting and bonding uppers to outer soles, and concluding with final polishing, quality inspection, and packaging.

In industrial production lines utilizing division of labor, work tasks are arranged sequentially according to technological dependence: component creation (cutting), sub-assembly (stitching), structural assembly (sole bonding), and finishing/packaging. Specialized workers or stations complete each phase consecutively to minimize idle time, reduce equipment changeover costs, and maximize total throughput.

Step-by-Step Solution

1

Identify the primary raw material preparation stage.

Cutting raw leather into component patterns is identified as the first stage.

Division of labor in manufacturing begins with sizing raw inputs into usable component parts prior to assembly.

2

Determine the sub-assembly phase for component parts.

Stitching upper sections and linings together is identified as the second stage.

Individual cut pieces must be joined into a cohesive upper body before structural attachment to the base.

3

Identify the main structural integration stage.

Lasting uppers and bonding them to outer soles is identified as the third stage.

The stitched upper unit must be shaped around a last and permanently attached to the sole structure.

4

Locate the terminal finishing and quality assurance phase.

Cleaning, polishing, quality inspection, and boxing is identified as the final stage.

Quality checks, finishing touches, and packaging take place only after full product assembly is completed.

Key Concept

Sequential Division of Labor in Industrial Manufacturing

Question 4903Question →

The table below presents the market transactions across three stages in the production of wooden furniture:

Stage of Production	Output Value (₦)	Cost of Intermediate Inputs (₦)
Logging	40,000	0
Sawmilling	75,000	40,000
Furniture Manufacturing	130,000	75,000

What is the total net contribution of this production chain to Gross Domestic Product (GDP) using the output method?

₦130,000

₦245,000

₦115,000

₦90,000

Show answer & explanation

Answer: ₦130,000

Answer

The total net contribution to Gross Domestic Product (GDP) is ₦130,000.

Under the output (value added) method of national income accounting, contribution to GDP is determined by summing the value added at each stage of production. Value added is equal to gross output value minus intermediate input costs: Logging adds ₦40,000, Sawmilling adds ₦35,000 (₦75,000 - ₦40,000), and Furniture Manufacturing adds ₦55,000 (₦130,000 - ₦75,000). Total contribution to GDP is ₦40,000 + ₦35,000 + ₦55,000 = ₦130,000, which also corresponds directly to the final sale value of the consumer product.

Step-by-Step Solution

1

Calculate the value added at each stage of production by subtracting intermediate input costs from output value.

Logging:

₦40,000 - ₦0 = ₦40,000

; Sawmilling:

₦75,000 - ₦40,000 = ₦35,000

; Furniture Manufacturing:

₦130,000 - ₦75,000 = ₦55,000

.

The output method measures national income by isolating the net value created at each stage of production.

2

Sum the value added across all production stages.

\text{Total Value Added} = ₦40,000 + ₦35,000 + ₦55,000 = ₦130,000

.

Summing net additions to output yields the actual total value of final goods produced without double counting.

Key Concept

Output (Value Added) Method of Measurement

Estimated Time:1m 30s

Question 4904Question →

An oil refinery in Nigeria expands its distillation operations to satisfy a surge in domestic demand for Premium Motor Spirit (PMS). Because diesel and bitumen are derived from the exact same crude oil refining process alongside PMS, how will the market supply of diesel be affected?

The supply of diesel will increase automatically as an inescapable byproduct of PMS refining.

The supply of diesel will contract because refining capacity is redirected away from diesel toward PMS.

The supply of diesel will remain entirely unaffected because consumer demand for diesel is independent of PMS demand.

The market price of crude oil will decline immediately due to joint supply equilibrium.

Show answer & explanation

Answer: The supply of diesel will increase automatically as an inescapable byproduct of PMS refining.

Answer

The supply of diesel will increase automatically as an inescapable byproduct of PMS refining.

PMS and diesel are byproducts of crude oil refining, representing joint (complementary) supply. Increasing the output of PMS requires processing more crude oil, which automatically increases the market supply of diesel.

Step-by-Step Solution

1

Identify the production relationship between the goods.

PMS and diesel originate from processing a single raw input (crude oil) in a single refining process.

Goods produced together from one source are in joint (or complementary) supply.

2

Analyze the impact of increased PMS refining output on diesel.

Expanding the distillation of crude oil for PMS automatically yields extra diesel and other fractions.

In joint supply, increasing the supply of the main product inherently increases the supply of the byproduct/joint product.

Key Concept

Joint (Complementary) Supply

Estimated Time:1m 30s

Question 4905Question →

An adult invertebrate specimen collected from soil leaf litter is observed to have a body divided into two distinct regions (cephalothorax and abdomen), four pairs of jointed walking appendages, and no antennae. Which taxonomic class and skeleton type correctly characterize this organism's support and locomotory framework?

Insecta, supported by a chitinous exoskeleton

Arachnida, supported by a chitinous exoskeleton

Crustacea, supported by a hydrostatic skeleton

Myriapoda, supported by a cartilaginous endoskeleton

Show answer & explanation

Answer: Arachnida, supported by a chitinous exoskeleton

Answer

The specimen belongs to the class Arachnida and is supported by a chitinous exoskeleton.

Members of the class Arachnida (Phylum Arthropoda) have their bodies divided into two main parts: an anterior cephalothorax (prosoma) and a posterior abdomen (opisthosoma). They bear four pairs of jointed walking legs and lack antennae. Like all arthropods, their body is enclosed in a tough chitinous exoskeleton that provides rigid mechanical support, prevents desiccation, and serves as an attachment site for muscles that drive locomotion.

Step-by-Step Solution

1

Analyze anatomical features given in the scenario

Two body divisions (cephalothorax and abdomen), 4 pairs (8 total) of jointed legs, and 0 antennae.

These morphological features define the diagnostic characteristics of arthropod classes.

2

Identify the taxonomic class matching these appendages and body tagmata

Arachnida (e.g., spiders, scorpions, ticks, and mites).

Insects have 3 body divisions and 3 pairs of legs; crustaceans have 2 pairs of antennae and 5+ leg pairs; myriapods have many legs and 1 pair of antennae.

3

Determine the support structure characteristic of this phylum

Chitinous exoskeleton.

All arthropods possess an exoskeleton made primarily of chitin that serves as a protective framework and site for antagonistic muscle attachment during movement.

Key Concept

Arthropod Appendage Differentiation and Exoskeletal Support

Estimated Time:1m 0s

Question 4906Question →

A manufacturing firm operates in the short run with a total fixed cost of $150. At an output level of$ 5 $units, its Average Variable Cost (AVC) is$ 30. When output increases to $6$ units, its Average Total Cost (ATC) is $55. What is the marginal cost of producing the$ 6^{\text{th}}$ unit?

$30

$180

$5

$55

Show answer & explanation

Answer: $30

Answer

$30

At 5 units of output, Total Variable Cost is

30 \times 5 =

150. Adding the Total Fixed Cost of

150 yields a Total Cost of

300. At 6 units, Total Cost is

55 \times 6 =

330. The Marginal Cost of the 6th unit is the difference in Total Cost:

330 -

300 = $30.

Step-by-Step Solution

1

Calculate Total Variable Cost and Total Cost at 5 units

TVC(5) =

150 and TC(5) =

300

TVC = AVC × Q = 30 × 5 =

150. TC = TFC + TVC = 150 + 150 =

300.

2

Calculate Total Cost at 6 units

TC(6) = $330

TC = ATC × Q = 55 × 6 = $330.

3

Calculate Marginal Cost of the 6th unit

MC(6) = $30

MC = TC(6) - TC(5) = 330 - 300 = $30.

Key Concept

Short-Run Marginal Cost and Total Cost Derivation

Question 4907Question →

Match each demand phenomenon or theoretical principle under the Law of Demand with its corresponding economic description.

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Answer

Income effect matches the increase in purchasing power from a price fall; Substitution effect matches replacing expensive alternatives; Law of Demand matches the inverse price-quantity relationship ceteris paribus; Giffen Paradox matches an upward-sloping demand curve driven by a dominant negative income effect.

Each concept correctly identifies a distinct theoretical driver or exception of consumer demand behavior. The Income effect captures changes in real purchasing power; the Substitution effect reflects relative price adjustments; the Law of Demand defines the fundamental downward-sloping demand relationship; and the Giffen Paradox highlights an exception where negative income effects dominate substitution effects.

Step-by-Step Solution

1

Identify the mechanism behind income shifts caused by price changes.

A drop in price raises real purchasing power, enabling higher consumption of normal goods (Income effect).

Lower prices mean less money is required for the same quantity, freeing up budget.

2

Identify the mechanism behind relative price comparisons.

Consumers swap out relatively dearer alternatives for the cheaper good (Substitution effect).

Utility maximization dictates favoring cheaper substitute goods.

3

Define the foundational rule of demand analysis.

Price and quantity demanded move in opposite directions, assuming ceteris paribus (Law of Demand).

This forms the downward slope of standard demand curves.

4

Analyze the exception cases where price and quantity move in the same direction.

For Giffen goods, a price rise leads to higher demand as poor consumers spend more of their limited income on the essential inferior commodity (Giffen Paradox).

The strong negative income effect overwhelms the substitution effect.

Key Concept

Concept and Law of Demand

Question 4908Question →

A

3.0\text{ mol}

sample of

\text{SO}_3(g)

is placed in a

2.0\text{ dm}^3

rigid vessel and allowed to reach equilibrium at a constant temperature according to the equation:

2\text{SO}_3(g) \rightleftharpoons 2\text{SO}_2(g) + \text{O}_2(g)

If

2.0\text{ moles}

of

\text{SO}_2(g)

are present at equilibrium, what is the numerical value of the equilibrium constant,

K_c

, for this reaction?

2.0\text{ mol dm}^{-3}

4.0\text{ mol dm}^{-3}

1.0\text{ mol dm}^{-3}

0.5\text{ mol dm}^{-3}

Show answer & explanation

Answer: $2.0\text{ mol dm}^{-3}$

Answer

2.0\text{ mol dm}^{-3}

The equilibrium constant

K_c

is defined as the ratio of product concentrations raised to their stoichiometric coefficients to reactant concentrations raised to their coefficients. Converting equilibrium mole quantities to molar concentrations using the

2.0\text{ dm}^3

volume yields

[\text{SO}_3] = 0.5\text{ mol dm}^{-3}

,

[\text{SO}_2] = 1.0\text{ mol dm}^{-3}

, and

[\text{O}_2] = 0.5\text{ mol dm}^{-3}

. Substituting these values into

K_c = \frac{[\text{SO}_2]^2 [\text{O}_2]}{[\text{SO}_3]^2}

gives

2.0\text{ mol dm}^{-3}

.

Step-by-Step Solution

1

Determine equilibrium amounts of reactants and products in moles

Initial

n(\text{SO}_3) = 3.0\text{ mol}

. At equilibrium,

n(\text{SO}_2) = 2.0\text{ mol}

. From the

2:2:1

stoichiometry,

2.0\text{ mol}

of

\text{SO}_3

reacted, leaving

n(\text{SO}_3) = 3.0 - 2.0 = 1.0\text{ mol}

. The amount of

\text{O}_2

produced is

\frac{1}{2} \times 2.0 = 1.0\text{ mol}

.

Reaction stoichiometry dictates the mole changes between reactants and products.

2

Calculate equilibrium concentrations by dividing moles by volume (

V = 2.0\text{ dm}^3

)

[\text{SO}_3] = \frac{1.0\text{ mol}}{2.0\text{ dm}^3} = 0.5\text{ mol dm}^{-3}

,

[\text{SO}_2] = \frac{2.0\text{ mol}}{2.0\text{ dm}^3} = 1.0\text{ mol dm}^{-3}

,

[\text{O}_2] = \frac{1.0\text{ mol}}{2.0\text{ dm}^3} = 0.5\text{ mol dm}^{-3}

.

Equilibrium constant

K_c

requires molar concentrations in

\text{mol dm}^{-3}

rather than mole amounts.

3

Substitute concentrations into the

K_c

expression

K_c = \frac{[\text{SO}_2]^2 [\text{O}_2]}{[\text{SO}_3]^2} = \frac{(1.0)^2 \times 0.5}{(0.5)^2} = \frac{0.5}{0.25} = 2.0\text{ mol dm}^{-3}

.

The

K_c

expression places products over reactants raised to their stoichiometric powers.

Key Concept

Equilibrium Constant (

K_c

) Calculation

Question 4909Question →

Match each paleontological evidence or dating principle in Column A with its correct geological or evolutionary significance in Column B.

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Answer

Archaeopteryx lithographica matches with transitional link features between reptiles and birds; Index fossil matches with relative dating via widespread organisms of short geological lifespan; Law of Superposition matches with deeper layers containing older fossils in undisturbed strata; Radioactive decay half-life matches with absolute numerical dating based on isotopic decay.

Each paleontological term correctly matches its corresponding geological or evolutionary mechanism: Archaeopteryx demonstrates transitional evolution between reptiles and birds, index fossils serve as short-duration marker organisms across strata, the Law of Superposition determines relative age by depth order in undisturbed rocks, and half-life radioactive decay determines absolute numerical chronological age.

Step-by-Step Solution

1

Identify transitional fossil organisms and their anatomical significance.

Archaeopteryx is paired with the description of a transitional form combining bird and reptile traits.

Transitional forms provide direct structural evidence of evolutionary lineage changes in fossil records.

2

Differentiate relative dating principles from index fossil applications.

Law of Superposition is linked to relative strata order (older at bottom), whereas Index Fossils are linked to geographically broad, short-lived marker organisms.

Stratigraphy relies on layer placement, while index fossils correlate disparate rock formations globally.

3

Associate radiometric principles with absolute dating methods.

Radioactive decay half-life matches with absolute numerical dating.

Isotopic breakdown rates supply exact time scales measured in years rather than relative layer order.

Key Concept

Key paleontological concepts including transitional fossils, index fossils, stratigraphy, and radiometric dating techniques.

Question 4910Question →

Match each description or measurement indicator on the left with its corresponding concept (Economic Growth or Economic Development) on the right.

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Answer

Economic growth focuses on quantitative increases in national output (measured by GDP growth rates), while economic development is a qualitative transformation focusing on human welfare and living standards (measured by HDI).

Economic growth refers specifically to quantitative, measurable increases in national income and output (such as real GDP growth rates). In contrast, economic development is a qualitative concept encompassing economic growth alongside structural changes, poverty reduction, and improved quality of life metrics measured by indices like the Human Development Index (HDI).

Step-by-Step Solution

1

Identify the nature of the first pair (quantitative real GDP increase)

A rise in real GDP represents a numerical increase in output, which defines Economic Growth.

Growth is single-dimensional and purely quantitative.

2

Identify the nature of the second pair (improvements in living standards, healthcare, literacy)

Qualitative socio-economic transformations define Economic Development.

Development addresses the quality of life beyond mere income generation.

3

Associate the measurement metrics for development and growth

HDI measures Economic Development, while the percentage increase in real output measures Economic Growth.

HDI incorporates life expectancy, schooling, and per capita income, whereas growth metrics focus solely on output change.

Key Concept

Distinction Between Economic Growth and Economic Development

Question 4911Question →

An aquatic arthropod is found to possess green glands at the base of its antennae for nitrogenous waste excretion and specialized gills for gaseous exchange. To which class of Arthropoda does this organism belong?

Crustacea

Insecta

Arachnida

Chilopoda

Show answer & explanation

Answer: Crustacea

Answer

The correct class is Crustacea.

Crustaceans are predominantly aquatic arthropods characterized by two pairs of antennae, respiratory gills, and paired green glands (antennal glands) that excrete nitrogenous waste at the base of the antennae.

Step-by-Step Solution

1

Identify the diagnostic excretory and respiratory structures specified in the question stem.

Excretory organ: green glands (antennal glands); Respiratory organ: gills.

Specialized excretory structures and respiratory organs vary across different classes of the phylum Arthropoda based on habitat and anatomy.

2

Match these anatomical features with the corresponding arthropod class.

Crustacea is the only arthropod class characterized by antennal green glands and aquatic gills.

Classes such as Insecta, Arachnida, and Chilopoda have adapted to terrestrial environments using Malpighian tubules, coxal glands, tracheae, or book lungs.

Key Concept

Diagnostic excretory and respiratory organs across Arthropod classes

Question 4912Question →

Match each Nigerian specialized development financial institution listed on the left with its primary operational mandate and economic objective on the right.

Click a left item, then click its matching right item

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Answer

The Bank of Industry matches with providing long-term industrial and manufacturing finance; the Nigerian Export-Import Bank matches with granting trade risk insurance and export credit to promote non-oil exports; the Federal Mortgage Bank of Nigeria matches with mobilizing housing funds for long-term residential mortgages; and the Bank of Agriculture matches with providing concessionary loans and micro-credit to primary agricultural producers.

Each specialized bank operates under a distinct legal mandate designed to address market failures in long-term credit provision: the Bank of Industry supports industrial manufacturing; NEXIM facilitates non-oil export trade and risk management; the Federal Mortgage Bank of Nigeria administers national housing mortgage funds; and the Bank of Agriculture provides direct agricultural credit to rural producers.

Step-by-Step Solution

1

Analyze the core mandate of the Bank of Industry (BOI).

BOI targets real-sector industrial growth, offering long-term loans and equity for manufacturing.

Development banking requires distinguishing sector-specific mandates from general commercial deposit-taking.

2

Analyze the core mandate of the Nigerian Export-Import Bank (NEXIM).

NEXIM addresses international trade market failures by providing export credit guarantees and risk insurance strictly for non-oil trade.

Specialized export credit agencies reduce foreign trade risks for domestic exporters.

3

Analyze the mandate of the Federal Mortgage Bank of Nigeria (FMBN).

FMBN operates as a specialized mortgage institution administering the National Housing Fund (NHF).

Mortgage banks bridge long-term funding gaps for housing capital formation.

4

Analyze the mandate of the Bank of Agriculture (BOA).

BOA provides microcredit and targeted agricultural financing to rural farmers and agribusinesses.

Development institutions lower borrowing costs for high-risk economic sectors like agriculture.

Key Concept

Operational mandates of specialized and development banks in Nigeria

Question 4913Question →

At a constant temperature,

1.0\text{ mole}

of carbon monoxide,

\text{CO}(g)

, and

1.0\text{ mole}

of steam,

\text{H}_2\text{O}(g)

, are introduced into a

2.0\text{ dm}^3

sealed vessel and allowed to reach equilibrium according to the equation:

\text{CO}(g) + \text{H}_2\text{O}(g) \rightleftharpoons \text{CO}_2(g) + \text{H}_2(g)

If

0.6\text{ mole}

of carbon dioxide, \text{CO}_2(g), is present at equilibrium, what is the numerical value of the equilibrium constant,

K_c

, at this temperature?

Show answer & explanation

Answer: 2.25

Answer

The numerical value of the equilibrium constant,

K_c

, is 2.25.

At equilibrium,

0.6\text{ mol}

of

\text{CO}_2

is present, which implies

0.6\text{ mol}

of

\text{H}_2

is also formed. The remaining amounts of reactants are

1.0 - 0.6 = 0.4\text{ mol}

for both

\text{CO}

and

\text{H}_2\text{O}

. Dividing by the vessel volume (

2.0\text{ dm}^3

) yields concentrations of

0.30\text{ mol dm}^{-3}

for products and

0.20\text{ mol dm}^{-3}

for reactants. Substituting these values into

K_c = \frac{[\text{CO}_2][\text{H}_2]}{[\text{CO}][\text{H}_2\text{O}]}

gives

K_c = \frac{0.30 \times 0.30}{0.20 \times 0.20} = 2.25

.

Step-by-Step Solution

1

Determine the equilibrium moles for all reactants and products

Equilibrium moles are:

\text{CO} = 0.4\text{ mol}

,

\text{H}_2\text{O} = 0.4\text{ mol}

,

\text{CO}_2 = 0.6\text{ mol}

, and

\text{H}_2 = 0.6\text{ mol}

.

Since 1 mole of

\text{CO}_2

is produced per mole of

\text{CO}

consumed, forming

0.6\text{ mol}

of

\text{CO}_2

consumes

0.6\text{ mol}

of

\text{CO}

and

0.6\text{ mol}

of

\text{H}_2\text{O}

, while producing

0.6\text{ mol}

of

\text{H}_2

.

2

Calculate equilibrium concentrations by dividing moles by volume (

2.0\text{ dm}^3

)

[\text{CO}] = 0.20\text{ mol dm}^{-3}

,

[\text{H}_2\text{O}] = 0.20\text{ mol dm}^{-3}

,

[\text{CO}_2] = 0.30\text{ mol dm}^{-3}

,

[\text{H}_2] = 0.30\text{ mol dm}^{-3}

.

Concentration is given by

C = \frac{n}{V}

where volume

V = 2.0\text{ dm}^3

.

3

Evaluate the equilibrium expression

K_c = \frac{[\text{CO}_2][\text{H}_2]}{[\text{CO}][\text{H}_2\text{O}]}

K_c = \frac{0.30 \times 0.30}{0.20 \times 0.20} = 2.25

.

Plugging in the calculated equilibrium concentrations into the law of mass action expression gives the value of

K_c

.

Key Concept

Calculating Equilibrium Constant (

K_c

) from Equilibrium Amounts

Question 4914Question →

Which of the following features best distinguishes economic development from economic growth?

It involves qualitative structural transformations and broad improvements in living standards.

It refers strictly to a quantitative, sustained increase in real National Income over time.

It is measured solely by the total monetary expansion of Gross Domestic Product.

It occurs automatically whenever a country experiences an increase in physical output.

Show answer & explanation

Answer: It involves qualitative structural transformations and broad improvements in living standards.

Answer

Economic development involves qualitative structural transformations and broad improvements in living standards.

Economic development goes beyond mere numerical expansion of goods and services; it involves qualitative improvements such as technological shifts, institutional reforms, and overall enhancement in societal welfare and living standards.

Step-by-Step Solution

1

Define Economic Growth

Economic growth is a quantitative concept measuring the sustained increase in real GDP or physical output over time.

Establishing the scope of growth helps isolate purely numerical expansion.

2

Define Economic Development

Economic development is a multidimensional qualitative concept incorporating structural changes, reduction of inequality, technological advancement, and higher living standards.

Understanding development highlights the qualitative aspect beyond aggregate numbers.

3

Compare and Identify the Distinctive Feature

Qualitative structural changes and welfare improvements distinguish development from simple growth.

Comparing both definitions confirms that growth is a necessary quantitative subset of broader development.

Key Concept

Distinction between Economic Growth and Economic Development

Question 4915Question →

An economy records a Gross Domestic Product (GDP) of $500 billion. The factor income earned by its citizens from abroad is$ 30 billion, while factor income paid to foreign residents domestically is $50 billion. If the capital consumption allowance (depreciation) is$ 40 billion, what is the Net National Product (NNP) of this economy?

$440 billion

$460 billion

$480 billion

$520 billion

Show answer & explanation

Answer: $440 billion

Answer

$440 billion

To find Net National Product (NNP), first calculate Net Factor Income from Abroad (NFIA) by subtracting factor income paid to foreigners (

50 billion) from factor income earned from abroad (

30 billion), giving -

20 billion. Adding NFIA to GDP gives Gross National Product (GNP =

500 billion -

20 billion =

480 billion). Finally, subtracting capital consumption allowance (

40 billion) from GNP yields NNP equal to

440 billion.

Step-by-Step Solution

1

Calculate Net Factor Income from Abroad (NFIA)

NFIA = Factor income from abroad - Factor income paid abroad =

30 billion -

50 billion = -$20 billion

NFIA measures the net flow of income between domestic citizens earning abroad and foreign residents earning within the domestic economy.

2

Calculate Gross National Product (GNP)

GNP = GDP + NFIA =

500 billion + (-

20 billion) = $480 billion

GNP accounts for the total economic output produced by citizens of a nation regardless of geographic boundary.

3

Calculate Net National Product (NNP)

NNP = GNP - Depreciation =

480 billion -

40 billion = $440 billion

Deducting capital consumption allowance (depreciation) from GNP yields the net production available after accounting for capital wear and tear.

Key Concept

Conversion from Gross Domestic Product (GDP) to Gross National Product (GNP) and Net National Product (NNP)

Question 4916Question →

An indifference curve is convex to the origin because the marginal rate of substitution ( $MRS_{xy}$ ) increases as a consumer substitutes commodity $X$ for commodity $Y$ along the curve.

True

False

Show answer & explanation

Answer: False

Answer

The statement is False. Indifference curves are convex to the origin due to a diminishing marginal rate of substitution (

MRS_{xy}

), not an increasing one.

The statement is false because standard indifference curves are convex to the origin due to the Principle of Diminishing Marginal Rate of Substitution. As a consumer substitutes good

X

for good

Y

, they are willing to give up successively fewer units of good

Y

for each additional unit of good

X

.

Step-by-Step Solution

1

Identify the relationship between the slope of an indifference curve and the Marginal Rate of Substitution (

MRS_{xy}

)

The slope of an indifference curve at any point represents the marginal rate of substitution (

MRS_{xy} = -\frac{\Delta Y}{\Delta X} = \frac{MU_x}{MU_y}

).

Convexity to the origin describes how this slope changes as a consumer moves down the curve from left to right.

2

Analyze how

MRS_{xy}

changes along a convex indifference curve

As the consumer acquires more units of

X

and fewer units of

Y

, the marginal utility of

X

(

MU_x

) falls while the marginal utility of

Y

(

MU_y

) rises, causing the ratio

\frac{MU_x}{MU_y}

to decrease (diminish).

This behavior follows the law of diminishing marginal utility under ordinal utility analysis.

3

Evaluate the validity of the statement

Because

MRS_{xy}

diminishes (decreases) rather than increases along the curve, the statement is false.

An increasing

MRS_{xy}

would produce a concave indifference curve to the origin.

Key Concept

Diminishing Marginal Rate of Substitution and Indifference Curve Convexity

Estimated Time:1m 0s

Question 4917Question →

Desert mammals such as the kangaroo rat survive in arid habitats with minimal access to free drinking water. Which of the following physiological adaptations primarily enables them to maintain internal water balance under these conditions?

Excreting hypertonic urine via elongated loops of Henle and relying on metabolic water produced from fat oxidation

Excreting large volumes of dilute urine using Malpighian tubules to eliminate metabolic wastes continuously

Acquiring heat tolerance during an individual's lifetime and transmitting this somatic physiological change to its offspring

Utilizing photolysis of water during dark cellular respiration to generate intra-tissue moisture

Show answer & explanation

Answer: Excreting hypertonic urine via elongated loops of Henle and relying on metabolic water produced from fat oxidation

Answer

Excreting hypertonic urine via elongated loops of Henle and relying on metabolic water produced from fat oxidation

The correct answer identifies that desert mammals possess nephrons with exceptionally long loops of Henle extending deep into the renal medulla. This structural length generates a high medullary hypertonicity, facilitating maximal reabsorption of water from the collecting ducts to produce concentrated (hypertonic) urine. Additionally, these animals rely heavily on metabolic water generated during the aerobic oxidation of fats.

Step-by-Step Solution

1

Identify the primary environmental challenge faced by desert mammals

Severe water scarcity requiring mechanisms to minimize water loss and obtain alternative water sources.

Arid environments lack abundant drinking water and present high evaporation rates.

2

Analyze renal physiological mechanisms for water conservation

Mammals with longer loops of Henle in their nephrons create a steeper osmotic gradient in the renal medulla, enabling extreme concentration of urine.

Hypertonic urine minimizes urinary water loss.

3

Analyze metabolic water production

The oxidation of dietary fats yields significant metabolic water (

H_2O

), supplying necessary cellular hydration.

Aerobic respiration breaks down lipids into carbon dioxide and water.

Key Concept

Physiological adaptations for water conservation in desert mammals

Estimated Time:1m 0s

Question 4918Question →

Match each type of money on the left with its corresponding economic definition or characteristic on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Legal Tender pairs with currency backed by law for debt settlement; Near Money pairs with liquid store-of-value assets not directly spendable; Commodity Money pairs with items having intrinsic non-monetary value; and Token Money pairs with coins whose face value exceeds their material value.

Each type of money is matched correctly according to standard monetary economic definitions: Legal Tender relies on statutory declaration; Near Money encompasses liquid financial assets; Commodity Money has inherent commodity worth; and Token Money has an intrinsic value lower than its face value.

Step-by-Step Solution

1

Identify the defining characteristic of Legal Tender.

Legal Tender is money declared by law to be accepted in payment of debts.

By definition, legal backing enforces acceptance for all transactions.

2

Identify the defining characteristic of Near Money.

Near Money refers to non-cash assets easily converted into liquidity.

Examples include savings deposits and short-term securities.

3

Identify the defining characteristic of Commodity Money.

Commodity Money has intrinsic value.

It functions both as a commodity in consumption/production and as currency.

4

Identify the defining characteristic of Token Money.

Token Money face value exceeds metallic value.

Modern coins cost less to produce than the denomination stamped on them.

Key Concept

Classification and definitions of types of money

Question 4919Question →

Match each national income accounting difficulty listed on the left with its corresponding economic effect or underlying cause listed on the right.

Click a left item, then click its matching right item

Show answer & explanation

Answer

Non-monetized subsistence production matches with causing underestimation in agrarian nations; inventory valuation during inflation matches with creating illusory expansion without physical increase; aggregation of intermediate inputs matches with double counting; and omission of unpaid domestic services matches with excluding activities lacking formal market prices.

Each difficulty in national income measurement is correctly paired with its economic consequence. Non-monetized subsistence production leads to an underestimation of output in rural developing nations; inflation creates nominal increases without real physical growth; counting intermediate goods alongside final output causes double counting; and unpaid domestic work is excluded due to the lack of monetary prices.

Step-by-Step Solution

1

Examine non-monetized subsistence production

Identified as a cause of severe national income undercount in agrarian developing economies.

Direct household consumption of agricultural yield bypasses monetary market channels.

2

Analyze price inflation effects on national income valuation

Determined that inflation inflates nominal values without increasing actual physical goods.

Nominal GDP measures output at prevailing market prices rather than constant real prices.

3

Evaluate the impact of counting intermediate inputs with final goods

Recognized this practice as the root cause of double counting.

The final price of a product already encompasses the economic value contributed by all intermediate production stages.

4

Assess unpaid domestic homemaking activities

Understood that such services are excluded because they lack monetary price tags.

National income accounting criteria require verifiable market transactions.

Key Concept

Difficulties and Problems in National Income Accounting

Question 4920Question →

The table below presents the utility schedule of a consumer consuming successive portions of roasted maize:

Quantity ( $Q$ )	Total Utility ( $TU$ ) in utils	Marginal Utility ( $MU$ ) in utils
1	18	18
2	34	16
3	$P$	12
4	54	$Q_m$
5	58	4
6	58	0
7	52	-6

Based on the table, what is the combined value of $P + Q_m$ , and at which unit of consumption does the consumer reach the point of satiety?

54

utils and the 6th unit

54

utils and the 5th unit

50

utils and the 6th unit

58

utils and the 7th unit

Show answer & explanation

Answer: $54$ utils and the 6th unit

Answer

The combined value of

P + Q_m

is

54

utils, and the point of satiety is reached at the 6th unit.

To find

P

, add the marginal utility of the 3rd unit (

12

) to the total utility of the 2nd unit (

34

), yielding

P = 46

. To find

Q_m

, subtract the total utility of the 3rd unit (

46

) from the total utility of the 4th unit (

54

), yielding

Q_m = 8

. Summing these gives

46 + 8 = 54

utils. The point of satiety is the quantity at which marginal utility is zero (

MU = 0

), which occurs at the 6th unit where total utility peaks at

58

utils.

Step-by-Step Solution

1

Calculate the unknown Total Utility

P

at the 3rd unit.

P = TU_2 + MU_3 = 34 + 12 = 46

utils.

Total utility at quantity

Q

equals total utility at

Q-1

plus marginal utility at

Q

.

2

Calculate the unknown Marginal Utility

Q_m

at the 4th unit.

Q_m = TU_4 - TU_3 = 54 - 46 = 8

utils.

Marginal utility at quantity

Q

is the change in total utility resulting from consuming that unit.

3

Sum

P

and

Q_m

.

P + Q_m = 46 + 8 = 54

utils.

Simple addition of the calculated values.

4

Identify the point of satiety.

The 6th unit.

The point of satiety (maximum total satisfaction) occurs at the consumption level where Marginal Utility equals zero (

MU = 0

) and Total Utility reaches its maximum.

Key Concept

Law of Diminishing Marginal Utility and Relationship between Total Utility and Marginal Utility

Answer

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