All practice questions

In a genetic analysis of a plant species, a researcher observes that crossing a true-breeding round-seeded plant with a true-breeding wrinkled-seeded plant yields offspring that all produce round seeds. When these offspring self-pollinate, the resulting progeny exhibit both round and wrinkled seeds. Which statement correctly identifies the genetic terms for the hereditary units involved and their physiological state in the first-generation offspring?

A farmer with an available capital of $\text{N}250,000$ lists his pressing farm needs in order of priority as follows:

1. Purchase of high-yield seeds ($\text{N}250,000$)
2. Construction of an irrigation channel ($\text{N}200,000$)
3. Hiring additional farm labor ($\text{N}150,000$)
4. Installation of solar pest repellers ($\text{N}100,000$)

If the farmer allocates his entire budget to satisfy the highest priority item on his scale of preference, what is the opportunity cost of his decision?

A student performed an experiment to test for the presence of starch in a green leaf exposed to sunlight. What is the correct sequence of steps for carrying out this procedure from start to finish?

In a regional market, Cassava flour (Good $X$) and Yam flour (Good $Y$) are substitute goods in competitive demand, while Yam flour (Good $Y$) and Egusi seeds (Good $Z$) are in joint demand. A sudden government tax increases the market price of Cassava flour (Good $X$), while consumer average disposable income simultaneously falls across the region (assuming Yam flour is a normal good). Which of the following correctly describes the underlying shift mechanisms and structural impacts on the demand curves for Yam flour (Good $Y$) and Egusi seeds (Good $Z$)?

In an energy profile diagram for a reversible chemical reaction, the potential energy of the reactants is $85\text{ kJ mol}^{-1}$, the potential energy of the products is $150\text{ kJ mol}^{-1}$, and the peak potential energy of the activated complex is $235\text{ kJ mol}^{-1}$. What is the activation energy of the reverse reaction in $\text{kJ mol}^{-1}$?

Match each type of plant meristematic tissue on the left with its correct primary growth role on the right.

A botanist collects a vascular seed plant and observes that its xylem tissue consists entirely of tracheids without vessel elements, while its reproductive structures are organized into cones. Which of the following characteristics is also expected in this plant?

Match each utility concept on the left with its corresponding mathematical or economic description on the right.

The daily agricultural output (in tonnes) of a cassava farm over five consecutive days was recorded as 12, 15, 18, 15, and 20. What is the mean daily output of the farm in tonnes?

Match each chemical process or reagent involving alkenes and alkynes in Column A with its corresponding chemical observation or primary product in Column B.

In human genetics, sickle-cell anaemia and Down syndrome represent two distinct types of genetic disorders. Which of the following statements correctly differentiates between the underlying genetic causes of these two conditions?

According to Hess's law of constant heat summation, the total enthalpy change of a chemical reaction depends only on the initial reactants and final products, regardless of the intermediate pathway taken.

In human ABO blood groups, an individual carrying both the $I^A$ and $I^B$ alleles expresses both A and B antigens equally on the surface of red blood cells, demonstrating codominance.

A profit-maximizing monopolist determines its equilibrium output in both the short run and the long run at the point where marginal revenue equals marginal cost ($MR = MC$).

During industrial fuel gas manufacture, passing steam over incandescent coke yields water gas, whereas passing air over red-hot coke produces producer gas. Which of the following statements correctly explains why water gas possesses a significantly higher calorific value per unit volume than producer gas?

Match each basic economic problem of society on the left with the economic mechanism or principle that primarily determines its resolution on the right.

In ecosystem structure, the specific functional role and behavioral position that an organism occupies within its environment is defined as its

In gymnosperms, the nutritive tissue that nourishes the embryo develops from the female gametophyte before fertilization and is haploid ($n$), whereas in angiosperms, the nutritive endosperm develops after double fertilization and is typically triploid ($3n$).

According to Jean-Baptiste Lamarck's theory of evolution, physical modifications developed by an organism during its lifetime in response to environmental demands are directly transmitted to its offspring. Is this statement true or false?

A reciprocal translocation between non-homologous chromosomes alters the arrangement of genes on the affected chromosomes without changing the total count of chromosomes in a diploid cell, whereas meiotic non-disjunction causes aneuploidy by altering the total chromosome number in the resulting gametes.