POST UTME ABU 2020 Biology | Objective

Are you preparing for POST UTME ABU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 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 cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
Correct A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromosomes
D. To form the nuclear envelope

Correct Answer: A

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Question 2
A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes would be most affected by a change in pH?
A. Lactase
B. Amylase
Correct C. Pep\sin
D. Tryp\sin

Correct Answer: C

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Question 3
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 4
A plant cell is shown below. What is the function of the part labeled 'B'?
A. To store water and nutrients
Correct B. To provide structural support
C. To regulate gas exchange
D. To produce hormones

Correct Answer: B

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Question 5
A diagram of the human brain is shown below. What is the function of the part labeled 'C'?
A. To control movement
B. To regulate body temperature
Correct C. To process sensory information
D. To produce hormones

Correct Answer: C

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Question 6
In a tropical rainforest, the primary consumers are typically small animals such as insects, rodents, and birds. What is the primary source of energy for these organisms?
Correct A. Plants
B. Microorganisms
C. Decomposers
D. Other animals

Correct Answer: A

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Question 7
A population of rabbits is growing according to the \logistic growth equation: dP/dt = rP\( 1-P/K \). If the initial population size is 100 and the carrying capacity is 1000, what is the population size after 5 years?
A. 500
B. 750
Correct C. 1000
D. 1250

Correct Answer: C

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Question 8
A geneticist is studying the inheri\tance of a particular trait in a population of pea plants. The trait is controlled by a \single gene with two alleles: R (dominant) and r (recessive). If a plant has the genotype Rr, what is the probability that it will pass on the R allele to its offspring?
Correct A. 0.5
B. 0.25
C. 0.75
D. 0.33

Correct Answer: A

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Question 9
A cell is placed in a solution with a high concentration of glu\cose. What will happen to the cell's membrane potential?
A. It will become more negative
Correct B. It will become more positive
C. It will remain the same
D. It will become zero

Correct Answer: B

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Question 10
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
B. Transporting sugars and amino acids
C. Storing starch and proteins
D. Regulating temperature

Correct Answer: A

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Question 11
A study on the genetic variation of a population found that the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 200
Correct B. 400
C. 600
D. 800

Correct Answer: B

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Question 12
A researcher is studying the effect of pH on the growth of E. coli bacteria. The researcher finds that the bacteria grow best at a pH of 7.5. However, the bacteria are unable to grow at a pH of 5.5. What is the likely reason for this?
Correct A. The bacteria are unable to produce the enzymes necessary for growth at a pH of 5.5.
B. The bacteria are unable to survive at a pH of 5.5 due to the presence of toxic compounds.
C. The bacteria are unable to grow at a pH of 5.5 due to the lack of essential nutrients.
D. The bacteria are unable to grow at a pH of 5.5 due to the presence of competing microorganisms.

Correct Answer: A

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Question 13
A forest e\cosystem is composed of a variety of plant and animal species. What is the term for the process by which energy is transferred from one trophic level to the next?
A. Decomposition
B. Nutrient cycling
C. Primary production
Correct D. Energy transfer

Correct Answer: D

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Question 14
A cell is composed of various organelles that perform different functions. What is the term for the membrane-bound organelle responsible for protein synthesis?
A. Mitochondria
B. Chloroplast
C. Endoplasmic reticulum
Correct D. Ribosome

Correct Answer: D

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Question 15
A population of rabbits is growing exponentially. If the initial population size is 100 and the growth rate is 0.2 per year, what is the population size after 5 years?
A. 1000
Correct B. 2000
C. 3000
D. 4000

Correct Answer: B

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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 homozygous dominant genotype 'AA'?
A. 0.16
B. 0.32
Correct C. 0.64
D. 0.8

Correct Answer: C

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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. 1/4
B. 1/2
C. 3/4
D. 1

Correct Answer: A

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Question 18
A diagram of a plant cell is shown below. Which of the following organelles is responsible for protein synthesis?
A. Nucleus
B. Mitochondria
Correct C. Ribosomes
D. Cell wall

Correct Answer: C

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Question 19
A diagram of a human eye is shown below. Which of the following parts of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 20
A diagram of a bacterial cell is shown below. Which of the following parts of the cell is responsible for DNA replication?
A. Cell wall
B. Plasma membrane
C. Ribosomes
Correct D. Nucleoid

Correct Answer: D

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Question 21
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells is known as?
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication

Correct Answer: A

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Question 22
The process by which plants convert light energy into chemical energy is known as?
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Evaporation

Correct Answer: B

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Question 23
The type of connective tissue that forms the majority of the body's support structure is known as?
Correct A. Bone Tissue
B. Cartilage Tissue
C. Ligament Tissue
D. T\endon Tissue

Correct Answer: A

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Question 24
The process by which the body's cells obtain the nutrients they need is known as?
Correct A. Digestion
B. Absorption
C. Assimilation
D. Excretion

Correct Answer: A

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Question 25
The type of microorganism that causes the disease tuberculosis is known as?
Correct A. Bacteria
B. Virus
C. Fungus
D. Parasite

Correct Answer: A

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