POST UTME ACHIEVERS UNIVERSITY 2025 Biology | Objective

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Question 1 View Details
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. 0.36
Correct B. 0.64
C. 0.8
D. 0.96

Correct Answer: B

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Question 2 View Details
A 5% solution of glu\cose in water is isotonic with a 2% solution of urea in water. What is the molarity of the glu\cose solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: A

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Question 3 View Details
A diagram of a plant cell is shown below.
A. The cell membrane is the outermost layer of the cell.
Correct B. The nucleus is the organelle that contains the cell's genetic material.
C. The mitochondria are the organelles responsible for generating energy for the cell.
D. The cell wall is the rigid layer that provides support and structure to the cell.

Correct Answer: B

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Question 4 View Details
A 2.5 L sample of a solution containing 0.15 M NaCl is diluted to a total volume of 5 L. What is the concentration of the NaCl solution after dilution?
A. 0.015 M
Correct B. 0.03 M
C. 0.045 M
D. 0.06 M

Correct Answer: B

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Question 5 View Details
A diagram of a simple circuit is shown below.
A. The circuit is a series circuit.
B. The circuit is a parallel circuit.
C. The circuit is a combination of series and parallel circuits.
Correct D. The circuit is a closed circuit.

Correct Answer: D

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Question 6 View Details
In a tropical rainforest, the presence of a large number of epiphytes such as orchids and ferns is an example of which eco\logical process?
A. Niche partitioning
B. Eco\logical succession
Correct C. Symbiotic relationships
D. Competition for resources

Correct Answer: C

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Question 7 View Details
The process by which plants release water vapor into the air through their leaves is known as?
Correct A. Transpiration
B. Respiration
C. Photosynthesis
D. Evaporation

Correct Answer: A

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Question 8 View Details
The cell membrane is semi-permeable due to the presence of?
A. Lipids
Correct B. Proteins
C. Carbohydrates
D. Nucleic acids

Correct Answer: B

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Question 9 View Details
The process by which the body removes waste products is known as?
Correct A. Excretion
B. Osmoregulation
C. Homeostasis
D. Regulation of body temperature

Correct Answer: A

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Question 10 View Details
The hormone that regulates the level of glu\cose in the blood is?
Correct A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroxine

Correct Answer: A

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Question 11 View Details
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 View Details
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'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 0.9

Correct Answer: A

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Question 13 View Details
A 5-year-old child is brought to the doctor with symptoms of malnutrition. The child's height is 90 cm, and the child's weight is 12 kg. What is the child's body mass index (BMI)?
Correct A. 12.5
B. 15.6
C. 18.7
D. 20.8

Correct Answer: A

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Question 14 View Details
A diagram of the human eye is shown below. What is the function of the part labeled 'C'?
A. to focus light
B. to re\fract light
Correct C. to detect light
D. to absorb light

Correct Answer: C

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Question 15 View Details
A diagram of the human digestive system is shown below. What is the function of the part labeled 'E'?
A. to break down food
B. to absorb nutrients
C. to digest proteins
Correct D. to absorb water

Correct Answer: D

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Question 16 View Details
A study on the genetic variation of a population revealed that the frequency of the dominant allele is 0.6. If the population size is 1000, what is the expected number of individuals with the dominant phenotype?
A. 400
Correct B. 480
C. 560
D. 640

Correct Answer: B

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Question 17 View Details
A researcher is studying the effect of a new antibiotic on a bacterial culture. The culture is initially composed of 1000 bacteria, and the antibiotic reduces the population by 20% every hour. If the researcher wants to know the population after 3 hours, what is the expected number of bacteria?
Correct A. 512
B. 640
C. 768
D. 896

Correct Answer: A

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Question 18 View Details
A cell is undergoing mitosis. If the cell has 32 chromosomes, how many chromosomes will each daughter cell have after mitosis?
A. 32
Correct B. 64
C. 128
D. 256

Correct Answer: B

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Question 19 View Details
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 subs\tances
C. Involved in photosynthesis
D. Stores genetic information

Correct Answer: A

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Question 20 View Details
A diagram of a human eye is shown below. What is the function of the lens?
A. Regulates the amount of light entering the eye
Correct B. Changes the shape of the eye to focus on objects
C. Detects light and s\ends signals to the brain
D. Produces tears to lubricate the eye

Correct Answer: B

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Question 21 View Details
In a tropical rainforest, the primary consumers are primarily composed of which of the following?
Correct A. Herbivorous insects
B. Fruit-eating bats
C. Large carnivorous mammals
D. Decomposers

Correct Answer: A

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Question 22 View Details
The process of osmoregulation in animals involves the regulation of which of the following?
A. Water balance
B. Sodium balance
C. Potassium balance
Correct D. All of the above

Correct Answer: D

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Question 23 View Details
In a desert e\cosystem, the primary producers are primarily composed of which of the following?
A. Cacti
B. Succulents
C. Desert grasses
Correct D. All of the above

Correct Answer: D

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Question 24 View Details
The process of respiration in animals involves the breakdown of which of the following?
Correct A. Glu\cose
B. Proteins
C. Fats
D. Carbohydrates

Correct Answer: A

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Question 25 View Details
In a coral reef e\cosystem, the primary consumers are primarily composed of which of the following?
A. Herbivorous fish
B. Carnivorous fish
C. Decomposers
Correct D. All of the above

Correct Answer: D

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