POST UTME NILE UNIVERSITY 2024 Biology | Objective

Are you preparing for POST UTME NILE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 10,000, what is the expected number of homozygous recessive individuals?
Correct A. 200
B. 400
C. 800
D. 1600

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Lens
Correct C. Retina
D. Iris

Correct Answer: C

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Question 3
A plant is placed in a potting mix with a pH of 6.5. If the plant requires a pH of 5.5 to grow optimally, what type of fertilizer should be added to the potting mix?
Correct A. Acidic fertilizer
B. Basic fertilizer
C. Neutral fertilizer
D. Organic fertilizer

Correct Answer: A

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Question 4
A diagram of the human heart is shown below. Which part of the heart pumps blood to the lungs?
A. Left Ventricle
B. Right Ventricle
Correct C. Pulmonary Valve
D. Tricuspid Valve

Correct Answer: C

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Question 5
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling movement?
A. Cerebrum
B. Cerebellum
Correct C. Basal Ganglia
D. Brainstem

Correct Answer: C

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Question 6
In a population of 1000 individuals, 50% are heterozygous for a particular gene, 30% are homozygous dominant, and 20% are homozygous recessive. What is the genotype of the individual that is heterozygous for this gene?
Correct A. Hh
B. HH
C. hh
D. H

Correct Answer: A

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Question 7
A researcher is studying the effect of pH on the growth of a microorganism. The researcher measures the growth rate of the microorganism at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and lowest at pH 5, what can be concluded about the optimal pH for the growth of the microorganism?
A. The optimal pH for the growth of the microorganism is between 5 and 7.
Correct B. The optimal pH for the growth of the microorganism is 7.
C. The optimal pH for the growth of the microorganism is 5.
D. The optimal pH for the growth of the microorganism is outside the range of 5 to 7.

Correct Answer: B

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Question 8
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 9
A researcher is studying the effect of temperature on the rate of a chemical reaction. The researcher measures the rate of the reaction at different temperatures and plots the data on a graph. If the rate of the reaction is highest at 50°C and lowest at 20°C, what can be concluded about the effect of temperature on the rate of the reaction?
Correct A. The rate of the reaction increases with increa\sing temperature.
B. The rate of the reaction decreases with increa\sing temperature.
C. The rate of the reaction remains cons\tant with increa\sing temperature.
D. The rate of the reaction is unaffected by temperature.

Correct Answer: A

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Question 10
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
Correct B. Iris
C. Retina
D. Lens

Correct Answer: B

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Question 11
In the context of cellular respiration, what is the primary function of the electron transport chain?
Correct A. To generate ATP from NADH and FADH2
B. To produce water from oxygen and electrons
C. To synthesize glu\cose from CO2 and H2O
D. To generate NADH and FADH2 from glu\cose

Correct Answer: A

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Question 12
A population of bacteria is growing exponentially. If the initial population size is 100 cells and the growth rate is 0.2 per hour, what will be the population size after 5 hours?
A. 1000 cells
B. 2000 cells
C. 5000 cells
Correct D. 10000 cells

Correct Answer: D

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Question 13
A plant cell is placed in a solution with a high concentration of salt. What will happen to the plant cell?
A. The plant cell will shrink due to water loss
Correct B. The plant cell will swell due to water uptake
C. The plant cell will remain unchanged
D. The plant cell will burst due to osmotic pressure

Correct Answer: B

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Question 14
A species of bird is classified as a member of the class Aves. What is the most specific taxonomic rank that can be assigned to this species?
A. Domain
B. Kingdom
C. Phylum
Correct D. Species

Correct Answer: D

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Question 15
A kidney stone is formed due to the precipitation of calcium oxalate crystals. What is the primary cause of this precipitation?
A. High pH
Correct B. Low pH
C. High temperature
D. Low temperature

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 expected frequency of the homozygous dominant genotype 'AA'?
A. 0.2
B. 0.4
Correct C. 0.6
D. 0.8

Correct Answer: C

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Question 17
A cell is placed in a medium containing 0.1 M glu\cose and 0.01 M galactose. If the cell is able to transport glu\cose but not galactose, what is the expected rate of glu\cose uptake?
A. 0.01 mmol/min
Correct B. 0.1 mmol/min
C. 1 mmol/min
D. 10 mmol/min

Correct Answer: B

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Question 18
A population of E. coli is growing in a nutrient-rich environment. If the population doubles every 2 hours, what is the expected population size after 4 hours?
A. 1000
B. 2000
Correct C. 4000
D. 8000

Correct Answer: C

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Question 19
A solution contains 0.1 M NaCl and 0.01 M KCl. If the solution is diluted by a factor of 10, what is the expected concentration of KCl?
A. 0.001 M
Correct B. 0.01 M
C. 0.1 M
D. 1 M

Correct Answer: B

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Question 20
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. If the plant requires a temperature of 20°C and a relative humidity of 80% to grow optimally, what is the expected rate of photosynthesis?
A. 0.01 mmol/min
B. 0.1 mmol/min
Correct C. 1 mmol/min
D. 10 mmol/min

Correct Answer: C

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Question 21
In the xylem, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the rest of the plant
C. Support and structure for the plant
D. Storage of food and water

Correct Answer: A

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Question 22
What is the term for the process by which plants release water vapor into the air?
Correct A. Transpiration
B. Respiration
C. Photosynthesis
D. Evaporation

Correct Answer: A

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Question 23
In the human body, what is the primary function of the blood-brain barrier?
A. To regulate the flow of oxygen and nutrients to the brain
Correct B. To prevent the entry of pathogens and toxins into the brain
C. To regulate the flow of waste products out of the brain
D. To regulate the flow of hormones into the brain

Correct Answer: B

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Question 24
What is the term for the process by which an organism's cells become specialized to perform specific functions?
Correct A. Differentiation
B. Mitosis
C. Meiosis
D. Genetic drift

Correct Answer: A

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Question 25
In the human eye, what is the primary function of the retina?
A. To focus light onto the lens
Correct B. To detect light and convert it into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye

Correct Answer: B

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