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POST UTME UNIOSUN 2021 Biology | Objective

Are you preparing for POST UTME UNIOSUN 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.

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Question 1

In a population of 1000 individuals, 70% are homozygous dominant (BB), 20% are heterozygous (Bb), and 10% are homozygous recessive (bb). What is the frequency of the recessive allele (b) in this population?

Correct A. 0.10

B. 0.20

C. 0.30

D. 0.40

Correct Answer: A

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Question 2

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 3

In a certain e\cosystem, the population of rabbits (R) and foxes (F) is governed by the following differential equations:\\( \frac{dR}{dt} = 0.5R - 0.02RF \\ \\ \frac{dF}{dt} = 0.01RF - 0.3F \\ \\ \\ \text{If} \\ R(0) = 100 \\ \\ \text{and} \\ F(0) = 20, \\ \\ \text{find} \\ R(10) \\ \\ \text{and} \\ F(10).

Correct A. R(10) = 50, F(10) = 10

B. R(10) = 75, F(10) = 15

C. R(10) = 100, F(10) = 20

D. R(10) = 125, F(10) = 25

Correct Answer: A

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Question 4

A diagram of a simple circuit is shown below. Identify the part labeled A.

Correct A. Batteries

B. Resistor

C. Switch

D. Ammeter

Correct Answer: A

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Question 5

A diagram of a titration setup is shown below. Identify the part labeled A.

Correct A. Burette

B. Conical Flask

C. Pipette

D. Titration Curve

Correct Answer: A

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Question 6

In a population of 1000 individuals, 200 are heterozygous for a particular gene, while 300 are homozygous recessive. What is the frequency of the dominant allele?

A. 0.3

B. 0.4

Correct C. 0.5

D. 0.6

Correct Answer: C

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Question 7

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 power output of the bird's wings?

A. 10 W

B. 20 W

Correct C. 30 W

D. 40 W

Correct Answer: C

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Question 8

A diagram shows a plant with a root system that has a taproot and a fibrous root system. What is the name of the plant?

Correct A. Radish

B. Carrot

C. Potato

D. Beetroot

Correct Answer: A

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Question 9

A diagram shows a circuit with a battery, a resistor, and a switch. If the switch is closed, what is the current flowing through the circuit?

A. 5 A

B. 10 A

Correct C. 15 A

D. 20 A

Correct Answer: C

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Question 10

A diagram shows a graph of the growth of a population over time. What is the name of the growth model?

A. Exponential Growth

Correct B. Logistic Growth

C. Sigmoid Growth

D. Linear Growth

Correct Answer: B

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Question 11

In a eukaryotic cell, the \endoplasmic reticulum is involved in which of the following processes?

Correct A. Protein synthesis

B. Lipid synthesis

C. Glycolysis

D. Mitosis

Correct Answer: A

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Question 12

The process of osmoregulation in plants involves the movement of water from the roots to the leaves through which of the following structures?

Correct A. Xylem

B. Phloem

C. Stomata

D. Cuticle

Correct Answer: A

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Question 13

In a tropical rainforest, the primary consumers are typically herbivores that feed on which of the following plants?

A. Grasses

Correct B. Trees

C. Ferns

D. Mosses

Correct Answer: B

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Question 14

The process of meiosis in eukaryotic cells results in the production of which of the following types of cells?

Correct A. Gametes

B. Somatic cells

C. Muscle cells

D. Nerve cells

Correct Answer: A

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Question 15

In a desert e\cosystem, the primary producers are typically which of the following plants?

Correct A. Cacti

B. Succulents

C. Grasses

D. Trees

Correct Answer: A

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Question 16

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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 17

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 18

In a human population, the frequency of the allele 'A' is 0.7 and the frequency of the allele 'a' is 0.3. What is the expected genotype frequency of the genotype 'AA'?

Correct A. 0.49

B. 0.42

C. 0.35

D. 0.28

Correct Answer: A

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Question 19

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 20

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 genotype 'AA'?

Correct A. 0.36

B. 0.28

C. 0.20

D. 0.12

Correct Answer: A

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Question 21

A species of plant has a reproductive strategy that involves the production of large numbers of seeds. This strategy is an example of which of the following reproductive modes?

Correct A. r-selection

B. K-selection

C. Semelparity

D. Iteroparity

Correct Answer: A

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Question 22

The process by which an organism's genetic information is passed from one generation to the next is known as?

A. Mutation

B. Genetic drift

C. Gene flow

Correct D. Heritability

Correct Answer: D

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Question 23

The diagram below shows the structure of a mitochondrion. Which of the following is the function of the cristae?

A. Protein synthesis

B. Electron transport

C. Fatty acid synthesis

Correct D. ATP production

Correct Answer: D

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Question 24

The Hardy-Weinberg principle states that a population will be in equilibrium if the following conditions are met. Which of the following is NOT one of the conditions?

A. Random mating

B. No mutation

C. No gene flow

Correct D. No natural selection

Correct Answer: D

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Question 25

The diagram below shows the structure of a plant cell. Which of the following is the function of the vacuole?

A. Protein synthesis

Correct B. Storage of water and nutrients

C. Fatty acid synthesis

D. ATP production

Correct Answer: B

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