Practice Post UTME OAU biology 2018 Past Questions

Question 1

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. 0.8

D. 0.16

Correct Answer: B

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Question 2

A diagram of a plant's vascular system is shown below. Which of the following is the primary function of the xylem?

Correct A. Transporting water and minerals from the roots to the leaves

B. Producing sugars through photosynthesis

C. Storing food and water in the stem

D. Regulating the plant's temperature

Correct Answer: A

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Question 3

A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the frequency of the bird's wingbeats per second?

A. 1.33

Correct B. 1.67

C. 2.0

D. 2.5

Correct Answer: B

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Question 4

A diagram of a simple harmonic motion is shown below. What is the amplitude of the motion?

A. 0.5 m

Correct B. 1.0 m

C. 1.5 m

D. 2.0 m

Correct Answer: B

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Question 5

A species of fish has a body length of 0.5 meters. If the fish is swimming at a speed of 2 m/s, what is the frequency of the fish's tailbeats per second?

A. 1.33

Correct B. 2.0

C. 2.5

D. 3.0

Correct Answer: B

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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'?

Correct A. 0.16

B. 0.36

C. 0.64

D. 0.84

Correct Answer: A

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Question 7

A patient has a genetic disorder caused by a mutation in the HBB gene. Which of the following is a possible consequence of this mutation?

Correct A. Sickle cell anemia

B. Thalassemia

C. Hemophilia

D. Cystic fibrosis

Correct Answer: A

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Question 8

In a human body, the circulatory system is responsible for transporting what?

A. Oxygen and carbon dioxide

B. Nutrients and waste products

C. Hormones and immune cells

Correct D. All of the above

Correct Answer: D

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Question 9

A plant cell has a cell wall made of cellulose. What is the primary function of this cell wall?

Correct A. To provide structural support

B. To regulate the movement of subs\tances

C. To protect the cell from pathogens

D. To facilitate cell division

Correct Answer: A

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Question 10

In a human lung, the alveoli are responsible for exchanging what?

Correct A. Oxygen and carbon dioxide

B. Nitrogen and oxygen

C. Carbon dioxide and water

D. Oxygen and water

Correct Answer: A

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Question 11

In the context of eco\logy, what is the primary function of a keystone species?

A. To maintain the population size of other species

Correct B. To regulate the food chain and maintain e\cosystem balance

C. To provide shelter and habitat for other species

D. To pollinate plants and facilitate seed dispersal

Correct Answer: B

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Question 12

A cell is placed in a hypertonic solution. What will happen to the cell?

Correct A. The cell will swell and eventually burst

B. The cell will shrink and lose water

C. The cell will remain unchanged

D. The cell will undergo mitosis

Correct Answer: A

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Question 13

A genetic cross is performed between two organisms with the following genotypes: F1 = AaBb and F2 = AaBb x aaBB. What is the probability of the offspring being homozygous recessive?

Correct A. 1/4

B. 1/2

C. 3/4

D. 3/8

Correct Answer: A

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Question 14

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

Correct A. Nucleus

B. Mitochondria

C. Chloroplast

D. Vacuole

Correct Answer: A

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Question 15

A diagram of a simple black and white chemistry apparatus showing a titration setup is shown below.

A. The burette contains the acid

B. The beaker contains the acid

Correct C. The burette contains the base

D. The beaker contains the base

Correct Answer: C

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Question 16

In the process of osmoregulation, which of the following is a primary function of the kidneys?

A. To regulate blood pressure

B. To regulate electrolyte balance

C. To regulate acid-base balance

Correct D. To regulate water balance

Correct Answer: D

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Question 17

In the context of cell division, what is the primary function of the centrioles?

Correct A. To form the spindle fibers

B. To form the centromeres

C. To form the kinetochores

D. To form the nuclear envelope

Correct Answer: A

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Question 18

In the context of hormonal coordination, what is the primary function of the hypothalamus?

A. To regulate body temperature

B. To regulate hunger and thirst

C. To regulate sleep and wakefulness

Correct D. To regulate the pituitary gland

Correct Answer: D

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Question 19

In the context of asexual reproduction, what is the primary function of the zygote?

Correct A. To form a new individual

B. To form a new cell

C. To form a new tissue

D. To form a new organ

Correct Answer: A

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Question 20

In the context of photosynthesis, what is the primary function of the chloroplast?

Correct A. To produce glu\cose

B. To produce oxygen

C. To produce ATP

D. To produce NADPH

Correct Answer: A

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Question 21

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

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.04

Correct Answer: A

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Question 22

SHARED STIMULUS

[pH 7: 100%, pH 4: 50%, pH 10: 0%, pH 12: 0%]

In a study on the effect of pH on the activity of the enzyme lactase, the following data were collected:

A. pH 7

Correct B. pH 4

C. pH 10

D. pH 12

Correct Answer: B

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Question 23

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'RR'?

Correct A. 0.5

B. 0.25

C. 0.75

D. 0.33

Correct Answer: A

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Question 24

In a population of rabbits, the frequency of the dominant allele 'B' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype?

Correct A. 0.04

B. 0.16

C. 0.36

D. 0.64

Correct Answer: A

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Question 25

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr'. What is the probability that the offspring will have the genotype 'Rr'?

Correct A. 0.5

B. 0.25

C. 0.75

D. 0.33

Correct Answer: A

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