POST UTME PAN-ATLANTIC UNIVERSITY 2020 Biology | Objective

Are you preparing for POST UTME PAN-ATLANTIC UNIVERSITY 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 a typical xylem vessel, what is the primary function of the lignin component?
Correct A. To provide structural support to the vessel
B. To facilitate the transport of water and minerals
C. To regulate the rate of transpiration
D. To store nutrients and water

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 2
A plant is placed in a sealed container with a mixture of oxygen and carbon dioxide. Over time, the plant's rate of respiration increases. What is the most likely explanation for this observation?
A. The plant is undergoing photosynthesis
B. The plant is experiencing increased transpiration
C. The plant is adapting to the changing environment
Correct D. The plant is u\sing the available oxygen to increase its metabolic rate

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 3
A bio\logist is studying the classification of living organisms. Which of the following kingdoms is characterized by the presence of a true nucleus and complex cell structures?
A. Monera
B. Protista
C. Fungi
Correct D. Animalia

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 4
A diagram of a typical animal tissue is shown below. What is the primary function of the tissue?
A. To provide structural support
Correct B. To facilitate the exchange of nutrients and waste
C. To regulate body temperature
D. To produce hormones

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 5
A diagram of a typical e\cosystem is shown below. What is the primary role of the decomposers in the e\cosystem?
A. To produce nutrients for the plants
B. To regulate the population of the animals
Correct C. To break down dead organic matter
D. To facilitate the exchange of gases

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 6
In a study on the evolution of antibiotic resis\tance, researchers found that the rate of resis\tance development was influenced by the frequency of antibiotic use. Which of the following best describes the relationship between antibiotic use and resis\tance development?
A. The more frequently antibiotics are used, the lower the rate of resis\tance development.
Correct B. The more frequently antibiotics are used, the higher the rate of resis\tance development.
C. There is no relationship between antibiotic use and resis\tance development.
D. The relationship between antibiotic use and resis\tance development is unclear.

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 7
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AAbbCC. What is the probability that the offspring will have the genotype AaBbCc?
A. 1/4
Correct B. 1/2
C. 3/4
D. 1

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 8
A diagram of a neuron is shown below. Which of the following structures is responsible for transmitting signals from the d\endrites to the axon?
A. D\endrite
B. Axon
Correct C. Cell Body
D. Synapse

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 9
A diagram of a titration setup is shown below. What is the purpose of the burette?
A. To measure the volume of the acid
Correct B. To measure the volume of the base
C. To mix the acid and base
D. To measure the pH of the solution

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 10
A diagram of a plant cell is shown below. Which of the following structures is responsible for photosynthesis?
Correct A. Chloroplast
B. Vacuole
C. Cell Wall
D. Mitochondria

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 11
In the context of hormonal coordination, what is the primary function of the hypothalamus in regulating the pituitary gland?
Correct A. Secretion of hormones that stimulate or inhibit the release of other hormones
B. Regulation of body temperature
C. Control of hunger and thirst
D. Maintenance of blood pressure

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 12
A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is initially at equilibrium, what will happen to the cell's osmotic pressure?
Correct A. Increase
B. Decrease
C. Remain the same
D. Become negative

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 13
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 osmotic pressure
D. Produces energy for the cell

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 14
A genetic cross is performed between two organisms with the following genotypes: F1 = AaBb and F2 = AaBb x aaBB. What is the probability of the offspring being homozygous recessive for the B gene?
Correct A. 1/4
B. 1/2
C. 3/4
D. 1

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 15
A diagram of a neuron is shown below. What is the function of the d\endrites?
Correct A. Receive signals from other neurons
B. Transmit signals to other neurons
C. Generate action potentials
D. Maintain the neuron's resting potential

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 16
In a photosynthetic pathway, which of the following is the primary electron acceptor in the light-dep\endent reactions?
A. ATP synthase
B. Plastocyanin
Correct C. Pheophytin
D. ferredoxin

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 17
The process of digestion in the small intestine is facilitated by which of the following enzymes?
A. Amylase
B. Lipase
C. Tryp\sin
Correct D. All of the above

Correct Answer: D

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 18
In the context of hormonal coordination, which of the following hormones is responsible for regulating blood glu\cose levels?
Correct A. Insulin
B. Glucagon
C. Adrenaline
D. Thyroxine

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 19
The sense organ responsible for detecting changes in sound pressure is the?
Correct A. Ear
B. Eye
C. Nose
D. Tongue

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 20
The microorganism responsible for cau\sing tuberculosis is?
Correct A. Mycobacterium tuberculosis
B. Staphylococcus aureus
C. Escherichia coli
D. Pseudomonas aeruginosa

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 21
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2, and the frequency of the dominant allele 'A' is 0.8. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the genotype 'AA'?
A. 0.16
B. 0.32
Correct C. 0.64
D. 0.8

Correct Answer: C

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 22
A bio\logist is studying the effect of pH on the growth of E. coli. The graph below shows the growth rate of E. coli at different pH levels.
A. The growth rate increases with increa\sing pH.
Correct B. The growth rate decreases with increa\sing pH.
C. The growth rate remains cons\tant at all pH levels.
D. The growth rate is highest at pH 7.

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 23
A plant has a genotype of 'Rr' for the flower color gene. What is the probability that the plant will produce a flower with the color 'red'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 24
A scientist is studying the effect of temperature on the rate of respiration in yeast. The graph below shows the rate of respiration at different temperatures.
Correct A. The rate of respiration increases with increa\sing temperature.
B. The rate of respiration decreases with increa\sing temperature.
C. The rate of respiration remains cons\tant at all temperatures.
D. The rate of respiration is highest at 25°C.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics
Question 25
A bio\logist is studying the effect of light on the growth of a plant. The graph below shows the growth rate of the plant at different light intensities.
Correct A. The growth rate increases with increa\sing light intensity.
B. The growth rate decreases with increa\sing light intensity.
C. The growth rate remains cons\tant at all light intensities.
D. The growth rate is highest at 100 μmol/m²s.

Correct Answer: A

Want to see the full step-by-step solution? Unlock AI Explanation & Analytics

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub:
Chat with Support