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POST UTME UNILAG 2021 Biology | Objective

Are you preparing for POST UTME UNILAG exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

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

A. Regulation of body temperature

B. Control of hunger and thirst

Correct C. Maintenance of homeostasis

D. Stimulation of reproductive hormones

Correct Answer: C

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Question 2

A diagram of a plant cell is shown below. What is the function of the cell wall?

Correct A. Provides structural support

B. Regulates the movement of materials in and out of the cell

C. Maintains the cell's shape

D. Produces energy for the cell

Correct Answer: A

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Question 3

In the context of eco\logical cycles, what is the primary function of decomposers?

A. Produce organic compounds

Correct B. Break down dead organisms and recycle nutrients

C. Produce oxygen through photosynthesis

D. Regulate the water cycle

Correct Answer: B

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Question 4

A diagram of a human brain is shown below. What is the function of the cerebellum?

A. Regulates body temperature

Correct B. Maintains balance and coordination

C. Processes sensory information

D. Produces hormones

Correct Answer: B

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Question 5

In the context of evolutionary theories, what is the primary mechanism of speciation?

A. Mutation

B. Genetic drift

C. Gene flow

Correct D. Allopatric speciation

Correct Answer: D

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Question 6

In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?

A. Genetic recombination

B. Mutation

C. Gene flow

Correct D. Genetic drift

Correct Answer: D

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Question 7

A plant cell is placed in a solution with a high concentration of sucrose. What is the expected change in the cell's osmotic pressure?

Correct A. Increase

B. Decrease

C. No change

D. Dep\end on the concentration

Correct Answer: A

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Question 8

A diagram of the human kidney is shown below. Which part of the kidney is responsible for filtering waste products from the blood?

A. Cortex

B. Medulla

C. Papilla

Correct D. Nephron

Correct Answer: D

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Question 9

A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 20% per hour, what is the population size after 3 hours?

A. 1000

B. 2000

Correct C. 4000

D. 8000

Correct Answer: C

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Question 10

A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients from the small intestine?

A. Mouth

B. Esophagus

C. Stomach

Correct D. Small intestine

Correct Answer: D

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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. 0.48

D. 0.16

Correct Answer: A

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Question 12

A plant with the genotype 'Tt' is crossed with a plant with the genotype 'TT'. What is the probability that the offspring will have the genotype 'tt'?

A. 0.25

B. 0.5

C. 0.75

Correct D. 0.33

Correct Answer: D

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Question 13

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

Correct A. Nucleus

B. Mitochondria

C. Cell Wall

D. Chloroplast

Correct Answer: A

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Question 14

A diagram of a human digestive system is shown below. Identify the part labeled 'B'.

A. Esophagus

Correct B. Stomach

C. Small Intestine

D. Large Intestine

Correct Answer: B

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Question 15

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

A. Lens

B. Iris

Correct C. Retina

D. Cornea

Correct Answer: C

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Question 16

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?

A. 120

B. 200

Correct C. 240

D. 280

Correct Answer: C

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Question 17

A 2.5-liter solution contains 1.8 liters of ethanol and 0.7 liters of water. What is the mole \fraction of ethanol?

A. 0.64

Correct B. 0.68

C. 0.72

D. 0.76

Correct Answer: B

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Question 18

A plant grows in a pot with a mixture of soil and sand. The plant's growth rate is 2.5 cm/day. If the soil-to-sand ratio is 3:1, what is the growth rate of the plant in the sand?

A. 1.7 cm/day

Correct B. 2.1 cm/day

C. 2.5 cm/day

D. 3.1 cm/day

Correct Answer: B

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Question 19

A 10-liter solution contains 5 liters of H2O and 3 liters of HCl. What is the pH of the solution?

A. 0.5

B. 1.0

Correct C. 1.5

D. 2.0

Correct Answer: C

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Question 20

A population of rabbits grows according to the \logistic equation dN/dt = rN\( 1-N/K \). If the initial population size is 100, the carrying capacity is 1000, and the growth rate is 0.5, what is the population size at time t = 10?

A. 500

B. 600

Correct C. 700

D. 800

Correct Answer: C

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Question 21

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the following protein kinase:

Correct A. CDK1

B. CDK2

C. CDK3

D. CDK4

Correct Answer: A

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Question 22

The process of glycolysis is initiated by the conversion of glu\cose to:

Correct A. Glu\cose-6-phosphate

B. Fructose-6-phosphate

C. Fructose-1,6-bisphosphate

D. Pyruvate

Correct Answer: A

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Question 23

The enzyme responsible for the conversion of pyruvate to acetyl-CoA in the citric acid cycle is:

Correct A. Pyruvate dehydrogenase

B. Citrate synthase

C. Isocitrate dehydrogenase

D. Alpha-ketoglutarate dehydrogenase

Correct Answer: A

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Question 24

The process of protein synthesis involves the translation of messenger RNA (mRNA) into a polypeptide chain, which is initiated by the binding of the following tRNA molecule to the ribosome:

Correct A. tRNA-Met

B. tRNA-Gln

C. tRNA-Glu

D. tRNA-Arg

Correct Answer: A

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Question 25

The process of meiosis is initiated by the replication of the chromosomes, which is followed by the separation of the homo\logous chromosomes during the following stage:

A. Prophase I

B. Metaphase I

Correct C. Anaphase I

D. Telophase I

Correct Answer: C

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