Practice Post UTME KSU biology 2020 Past Questions

Question 1

The Hardy-Weinberg principle states that allele frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

A. Random mating

B. No mutation

Correct C. No gene flow

D. No natural selection

Correct Answer: C

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Question 2

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. What is the expected frequency of the homozygous recessive genotype 'aa'?

Correct A. 0.04

B. 0.08

C. 0.12

D. 0.16

Correct Answer: A

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Question 3

The nervous system of an organism consists of two main types of neurons: sensory neurons and motor neurons. Which of the following is a characteristic of sensory neurons?

Correct A. They transmit signals from sensory receptors to the central nervous system

B. They transmit signals from the central nervous system to muscles or glands

C. They have a long axon that can transmit signals over long dis\tances

D. They have a short axon that can only transmit signals over short dis\tances

Correct Answer: A

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Question 4

In a terrestrial e\cosystem, the primary producers are plants that undergo photosynthesis to produce glu\cose and oxygen. Which of the following is a byproduct of photosynthesis?

A. Glu\cose

Correct B. Oxygen

C. Carbon dioxide

D. Water

Correct Answer: B

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Question 5

The process of cellular respiration involves the breakdown of glu\cose to produce energy in the form of ATP. Which of the following is a stage of cellular respiration?

A. Glycolysis

B. Citric acid cycle

Correct C. Electron transport chain

D. Fermentation

Correct Answer: C

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Question 6

In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

A. 0.36

Correct B. 0.64

C. 0.48

D. 0.72

Correct Answer: B

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Question 7

A researcher is studying the effect of pH on the growth of Escherichia coli. The graph below shows the relationship between pH and growth rate.

A. The growth rate is highest at pH 7.

Correct B. The growth rate is highest at pH 5.

C. The growth rate is highest at pH 9.

D. The growth rate is highest at pH 3.

Correct Answer: B

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Question 8

A population of rabbits is growing \logistically according to the equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the initial population is 100 and the carrying capacity is 1000, what is the population after 5 years?

A. 500

Correct B. 783.33

C. 1000

D. 2000

Correct Answer: B

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Question 9

A researcher is studying the effect of temperature on the rate of photosynthesis in plants. The graph below shows the relationship between temperature and rate of photosynthesis.

A. The rate of photosynthesis is highest at 20°C.

Correct B. The rate of photosynthesis is highest at 30°C.

C. The rate of photosynthesis is highest at 40°C.

D. The rate of photosynthesis is highest at 50°C.

Correct Answer: B

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Question 10

A population of bacteria is growing exponentially according to the equation \( P(t) = P_0 e^{rt} \). If the initial population is 100 and the growth rate is 0.2, what is the population after 5 years?

A. 1000

Correct B. 1488.41

C. 2000

D. 3000

Correct Answer: B

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Question 11

A study on the evolution of the human eye suggests that the development of the fovea is a result of natural selection acting on the variation in the size and shape of the optic nerve. Which of the following statements best describes the relationship between the fovea and the optic nerve?

A. The fovea is a direct result of the variation in the size and shape of the optic nerve.

Correct B. The fovea is an adaptation that has evolved to compensate for the limitations of the optic nerve.

C. The fovea is a vestigial structure that has lost its original function.

D. The fovea is a result of genetic drift acting on the population.

Correct Answer: B

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Question 12

A researcher is studying the effect of pH on the activity of the enzyme lactase. The researcher measures the activity of lactase at different pH levels and plots the data on a graph. Which of the following statements best describes the relationship between the pH and the activity of lactase?

A. The activity of lactase increases as the pH increases.

Correct B. The activity of lactase decreases as the pH decreases.

C. The activity of lactase is highest at a pH of 7.

D. The activity of lactase is unaffected by changes in pH.

Correct Answer: B

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Question 13

A population of birds is being studied to determine the effect of habitat fragmentation on their behavior. The researchers observe that the birds are more likely to engage in territorial behavior when the habitat is fragmented. Which of the following statements best explains the relationship between habitat fragmentation and territorial behavior?

Correct A. Habitat fragmentation leads to increased competition for resources, resulting in territorial behavior.

B. Habitat fragmentation reduces the availability of food, leading to increased aggression and territorial behavior.

C. Habitat fragmentation increases the dis\tance between individuals, leading to increased territorial behavior.

D. Habitat fragmentation has no effect on territorial behavior.

Correct Answer: A

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Question 14

A researcher is studying the effect of temperature on the growth rate of a microorganism. The researcher measures the growth rate of the microorganism at different temperatures and plots the data on a graph. Which of the following statements best describes the relationship between temperature and growth rate?

Correct A. The growth rate of the microorganism increases as the temperature increases.

B. The growth rate of the microorganism decreases as the temperature decreases.

C. The growth rate of the microorganism is highest at a temperature of 37°C.

D. The growth rate of the microorganism is unaffected by changes in temperature.

Correct Answer: A

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Question 15

A population of plants is being studied to determine the effect of light intensity on their growth. The researchers observe that the plants grow faster when exposed to higher light intensities. Which of the following statements best explains the relationship between light intensity and plant growth?

Correct A. Light intensity affects the rate of photosynthesis, leading to increased growth.

B. Light intensity affects the rate of respiration, leading to increased growth.

C. Light intensity has no effect on plant growth.

D. Light intensity affects the rate of transpiration, leading to increased growth.

Correct Answer: A

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Question 16

In a tropical rainforest e\cosystem, the primary producers are plants that undergo photosynthesis. Which of the following is a characteristic of the photosynthetic process?

Correct A. The release of oxygen as a byproduct

B. The absorption of carbon dioxide

C. The release of water vapor

D. The absorption of sunlight

Correct Answer: A

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Question 17

In a human body, the excretory system is responsible for removing waste products. Which of the following organs is NOT part of the excretory system?

A. Kidneys

B. Liver

C. Pancreas

Correct D. Heart

Correct Answer: D

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Question 18

In a sexual reproduction process, the fusion of gametes results in the formation of a zygote. Which of the following is a characteristic of the zygote?

A. It has a \single set of chromosomes

Correct B. It has a double set of chromosomes

C. It has a quadruple set of chromosomes

D. It has no chromosomes

Correct Answer: B

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Question 19

In a human eye, the retina contains specialized cells called photoreceptors. Which of the following is a characteristic of photoreceptors?

Correct A. They are sensitive to light

B. They are sensitive to sound

C. They are sensitive to touch

D. They are sensitive to smell

Correct Answer: A

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Question 20

In a human body, the circulatory system is responsible for transporting oxygen and nutrients to cells. Which of the following is a characteristic of the circulatory system?

Correct A. It is a closed system

B. It is an open system

C. It is a \single-loop system

D. It is a double-loop system

Correct Answer: A

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Question 21

In the process of osmoregulation, what is the primary function of the kidneys in a hypertonic environment?

Correct A. To excrete excess water

B. To reabsorb excess ions

C. To produce antidiuretic hormone

D. To regulate blood pressure

Correct Answer: A

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Question 22

A plant cell is placed in a solution with a higher concentration of solutes than the cell's cytoplasm. What will happen to the cell?

A. The cell will gain water and swell

Correct B. The cell will lose water and shrink

C. The cell will remain unchanged

D. The cell will burst

Correct Answer: B

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Question 23

In a sexual reproduction process, what is the term for the fusion of two gametes to form a zygote?

A. Meiosis

B. Mitosis

C. Fertilization

Correct D. Syngamy

Correct Answer: D

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Question 24

A genetic trait is controlled by a \single gene with two alleles. If the dominant allele is represented by the letter 'R' and the recessive allele is represented by the letter 'r', what is the genotype of an individual that is homozygous dominant?

Correct A. RR

B. Rr

C. rr

D. RrRr

Correct Answer: A

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Question 25

In a population of 100 individuals, 60 have the genotype 'RR' and 40 have the genotype 'Rr'. What is the frequency of the recessive allele 'r'?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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