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POST UTME OAU 2022 Biology | Objective

Are you preparing for POST UTME OAU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled between organisms?

Correct A. Decomposition

B. Photosynthesis

C. Respiration

D. Transpiration

Correct Answer: A

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Question 2

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

Correct A. To provide structural support

B. To regulate the movement of ions

C. To synthesize proteins

D. To store genetic information

Correct Answer: A

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Question 3

In a human kidney, what is the primary function of the glomerulus?

Correct A. To filter waste products from the blood

B. To regulate the concentration of ions

C. To synthesize hormones

D. To store water

Correct Answer: A

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Question 4

A diagram of a plant root system is shown below. What is the primary function of the root hairs?

Correct A. To absorb water and minerals

B. To synthesize proteins

C. To store genetic information

D. To regulate the movement of ions

Correct Answer: A

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Question 5

A diagram of a human circulatory system is shown below. What is the primary function of the coronary arteries?

A. To regulate the movement of ions

B. To synthesize proteins

C. To store genetic information

Correct D. To supply oxygenated blood to the heart muscle

Correct Answer: D

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Question 6

In a eukaryotic cell, the process of photosynthesis occurs in which organelle?

A. Mitochondria

Correct B. Chloroplast

C. Nucleus

D. Endoplasmic reticulum

Correct Answer: B

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Question 7

A plant cell is placed in a solution with a high concentration of salt. What happens to the cell?

A. The cell will swell and eventually burst.

Correct B. The cell will shrink and lose water.

C. The cell will remain unchanged.

D. The cell will grow and divide.

Correct Answer: B

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Question 8

A genetic trait is determined by a \single gene with two alleles. What is the probability that a child will inherit the recessive allele if the parents are both heterozygous?

A. 25%

Correct B. 50%

C. 75%

D. 100%

Correct Answer: B

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Question 9

A diagram of a plant's xylem and phloem tissues is shown below. What is the function of the xylem tissue?

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

B. Transporting sugars and other organic compounds from the leaves to the rest of the plant.

C. Supporting the plant's structure.

D. Regulating the plant's temperature.

Correct Answer: A

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Question 10

A diagram of a cell's mitotic spindle is shown below. What is the function of the mitotic spindle?

Correct A. Separating the chromosomes during cell division.

B. Forming the new cell membrane.

C. Regulating the cell cycle.

D. Producing the cytoplasm.

Correct Answer: A

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Question 11

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. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 12

A 2.5 L flask contains 0.5 M HCl. If 1.5 L of this solution is removed and replaced with 1.5 L of 0.5 M NaOH, what is the resulting concentration of HCl?

A. 0.25 M

Correct B. 0.5 M

C. 0.75 M

D. 1.0 M

Correct Answer: B

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Question 13

A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?

Correct A. Site of protein synthesis

B. Site of lipid synthesis

C. Site of carbohydrate synthesis

D. Site of nucleic acid synthesis

Correct Answer: A

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Question 14

A 0.5 M solution of NaOH is mixed with a 0.5 M solution of HCl. What is the resulting pH?

Correct A. 7

B. 8

C. 9

D. 10

Correct Answer: A

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Question 15

A diagram of a human eye is shown below. What is the function of the structure labeled 'Y'?

A. Detects light

B. Focuses light

Correct C. Transmits visual signals

D. Regulates pupil size

Correct Answer: C

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Question 16

In a population of 1000 individuals, 70% are homozygous dominant (BB), 20% are heterozygous (Bb), and 10% are homozygous recessive (bb). If a random sample of 50 individuals is taken, what is the probability that the sample will contain at least one homozygous recessive individual?

A. 0.05

B. 0.10

Correct C. 0.20

D. 0.30

Correct Answer: C

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Question 17

A cell is placed in a solution of 0.1 M glu\cose and 0.2 M fructose. If the cell membrane is selectively permeable to glu\cose but not to fructose, what will be the concentration of glu\cose in the cell after 30 minutes?

A. 0.05 M

Correct B. 0.10 M

C. 0.15 M

D. 0.20 M

Correct Answer: B

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Question 18

A 5 kg block of wood is placed on a frictionless surface and a force of 10 N is applied to it. If the block starts from rest, what will be its velocity after 2 seconds?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 19

A population of 1000 individuals is growing at a rate of 5% per year. If the initial population is 500 individuals, what will be the population after 10 years?

A. 1000

B. 1500

C. 2000

Correct D. 2500

Correct Answer: D

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Question 20

A 2 kg block of metal is heated from 20°C to 80°C. If the specific heat capacity of the metal is 400 J/kg°C, what will be the energy transferred to the metal?

A. 800 J

B. 1600 J

Correct C. 2400 J

D. 3200 J

Correct Answer: C

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Question 21

In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?

A. Regulation of body temperature

B. Stimulation of the immune system

Correct C. Maintenance of homeostasis

D. Regulation of appetite and satiety

Correct Answer: C

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Question 22

A plant is placed in a room with a temperature of 25°C and a relative humidity of 60%. If the plant's stomatal conduc\tance is 0.05 mol/m²s, what is the rate of transpiration?

A. 0.03 mol/m²s

Correct B. 0.05 mol/m²s

C. 0.07 mol/m²s

D. 0.10 mol/m²s

Correct Answer: B

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Question 23

A population of rabbits is growing exponentially, with a growth rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 5 years?

A. 1638

B. 2000

C. 2500

Correct D. 3000

Correct Answer: D

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Question 24

A diagram of the human eye is shown below. Identify the part labeled 'A'.

Correct A. Cornea

B. Iris

C. Retina

D. Lens

Correct Answer: A

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Question 25

A diagram of a chemical reaction is shown below. Identify the type of reaction.

A. Synthesis reaction

B. Decomposition reaction

Correct C. Replacement reaction

D. Combination reaction

Correct Answer: C

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