Practice post utme covenant university biology 2024 Past Questions

Question 1

A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population size is 1000 and the Hardy-Weinberg principle holds, what is the expected frequency of the homozygous recessive genotype 'aa'?

A. 0.04

B. 0.08

C. 0.16

D. 0.32

Question 2

In a population of 1000 individuals, 70% are heterozygous for the gene controlling flower color, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual represented by the Punnett square below?

A. Genotype: BB, Phenotype: Red flowers

B. Genotype: Bb, Phenotype: Red flowers

C. Genotype: bb, Phenotype: White flowers

D. Genotype: Bb, Phenotype: White flowers

Question 3

Which of the following sense organs is responsible for detecting changes in sound waves?

A. Eye

B. Ear

C. Nose

D. Tongue

Question 4

A diagram of the xylem tissue is shown below. Which of the following structures is responsible for the transport of water and minerals from the roots to the leaves?

A. A

B. B

C. C

D. D

Question 5

In the context of eco\logy, what is the primary function of a "keystone species" in a given e\cosystem?

A. To occupy a unique eco\logical niche

B. To have a disproportionate impact on the environment

C. To be a primary consumer in the food chain

D. To be a top predator in the food chain

Question 6

The diagram below shows a simple e\cosystem. What is the role of the organism labeled A in this e\cosystem?

A. Primary consumer

B. Decomposer

C. Producer

D. Omnivore

Question 7

In a population of 1000 individuals, 70% are heterozygous for the gene controlling flower color, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype and phenotype of the individual represented by the Punnett square below?

A. Genotype: BB, Phenotype: Red flowers

B. Genotype: Bb, Phenotype: Red flowers

C. Genotype: bb, Phenotype: White flowers

D. Genotype: Bb, Phenotype: White flowers

Question 8

A study on the effect of temperature on the activity of an enzyme found that the enzyme is most active at a temperature of 37°C. What is the likely reason for this?

A. The enzyme has an optimal temperature for activity

B. The enzyme is sensitive to high temperatures

C. The enzyme is sensitive to low temperatures

D. The enzyme has a unique metabolic pathway

Question 9

In a plant cell, the vacuole is responsible for storing water and maintaining the cell's turgor pressure. What is the primary function of the vacuole in the cell?

A. Storing water and maintaining turgor pressure

B. Regulating cell growth and division

C. Producing energy for the cell

D. Removing waste products from the cell

Question 10

A 5-L flask contains a mixture of N2 and O2 at 25°C and 1 atm. The partial pressure of O2 is 0.5 atm. What is the mole \fraction of O2?

A. 0.1

B. 0.2

C. 0.3

D. 0.4

Question 11

A 1.5 L flask contains 0.3 mol of an ideal gas at 37°C. What is the pressure of the gas?

A. 100000

B. 101325

C. 102650

D. 103975

Question 12

In the context of excretion and osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?

A. Regulation of blood pH

B. Maintenance of electrolyte balance

C. Removal of waste products

D. Production of hormones

Question 13

The process by which plants convert light energy into chemical energy is known as

A. Photosynthesis

B. Respiration

C. Transpiration

D. Osmosis

Question 14

A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?

A. Cornea

B. Iris

C. Retina

D. Lens

Question 15

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. Assuming Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'aa'?

A. 0.04

B. 0.16

C. 0.24

D. 0.32

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