Exam Body

Year

Subject

Paper Type

POST UTME UNIPORT 2023 Biology | Objective

Are you preparing for POST UTME UNIPORT exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 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 evolutionary bio\logy, what is the primary mechanism driving the process of speciation in allopatric populations?

A. Genetic drift

B. Gene flow

Correct C. Natural selection

D. Mutation

Correct Answer: C

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

Question 2

A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?

Correct A. Gas exchange

B. Air filtration

C. Sound production

D. Temperature regulation

Correct Answer: A

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

Question 3

A population of bacteria is growing exponentially in a nutrient-rich environment. If the initial population size is 100 bacteria and the growth rate is 20% per hour, what will be the population size after 5 hours?

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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

Question 4

A diagram of the human excretory system is shown below. What is the primary function of the kidneys?

Correct A. Filtering waste from the blood

B. Regulating blood pressure

C. Producing hormones

D. Absorbing nutrients

Correct Answer: A

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

Question 5

A population of birds is exhibiting a phenomenon known as 'albinism'. What is the genetic basis of this condition?

A. Autosomal dominant

Correct B. Autosomal recessive

C. X-linked dominant

D. X-linked recessive

Correct Answer: B

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

Question 6

In a population of 1000 individuals, 200 are infected with a disease that has a 20% mortality rate. If 50% of the infected individuals are asymptomatic, what is the expected number of deaths due to the disease?

A. 20

B. 40

Correct C. 80

D. 100

Correct Answer: C

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

Question 7

A plant has a root system with a total surface area of 100 cm^2. If the root system is exposed to a nutrient solution with a concentration of 10^-3 M, what is the total amount of nutrients absorbed by the plant in 1 hour?

Correct A. 0.36

B. 3.6

C. 36

D. 360

Correct Answer: A

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

Question 8

A person has a blood pressure of 120/80 mmHg. If the diastolic pressure is 20% of the systolic pressure, what is the diastolic pressure?

Correct A. 24

B. 24.8

C. 25

D. 25.2

Correct Answer: A

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

Question 9

A person has a respiratory rate of 12 breaths per minute. If the tidal volume is 500 ml, what is the total volume of air exchanged per minute?

A. 100

B. 200

Correct C. 300

D. 400

Correct Answer: C

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

Question 10

A person has a body temperature of 37°C. If the temperature is measured u\sing a thermometer with a sensitivity of 0.1°C, what is the minimum detectable change in temperature?

Correct A. 0.001

B. 0.01

C. 0.1

D. 1

Correct Answer: A

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

Question 11

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' for red eyes is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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

Question 12

A diagram of a plant cell is shown below. Which organelle is responsible for photosynthesis?

A. Mitochondria

Correct B. Chloroplast

C. Nucleus

D. Vacuole

Correct Answer: B

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

Question 13

A species of bird has a mean wing length of 20 cm with a s\tandard deviation of 2 cm. If a sample of 16 birds is taken, what is the probability that the sample mean wing length is greater than 22 cm?

Correct A. 0.05

B. 0.01

C. 0.005

D. 0.001

Correct Answer: A

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

Question 14

A diagram of a simple e\cosystem is shown below. Which of the following is an example of a secondary consumer?

A. Plant

B. Herbivore

Correct C. Carnivore

D. Decomposer

Correct Answer: C

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

Question 15

A species of bacteria has a generation time of 1 hour. If a sample of 1000 bacteria is taken, what is the probability that the sample contains at least one mu\tant?

Correct A. 0.1

B. 0.01

C. 0.001

D. 0.0001

Correct Answer: A

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

Question 16

In a tropical rainforest e\cosystem, the presence of a large population of herbivores can lead to a decrease in the population of a specific plant species. This is an example of a(n)

Correct A. trophic cascade

B. predator-prey interaction

C. competition for resources

D. mutualism

Correct Answer: A

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

Question 17

A plant's ability to undergo photosynthesis is dep\endent on the presence of which of the following pigments?

Correct A. Chlorophyll a

B. Chlorophyll b

C. Carotenoids

D. Anthocyanins

Correct Answer: A

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

Question 18

The process by which water moves through a plant, from the roots to the leaves, is known as

A. transpiration

B. photosynthesis

C. respiration

Correct D. translocation

Correct Answer: D

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

Question 19

The xylem is responsible for transporting water and minerals from the roots to the leaves of a plant. Which of the following is a characteristic of xylem tissue?

Correct A. It is composed of dead cells

B. It is responsible for gas exchange

C. It is composed of sieve cells

D. It is responsible for storing food

Correct Answer: A

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

Question 20

A population of rabbits is growing at a rate of 20% per year. If the initial population is 100 rabbits, what will be the population after 5 years?

A. 1000

B. 2000

Correct C. 4000

D. 8000

Correct Answer: C

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

Question 21

In the xylem transport system, what is the primary function of the xylem parenchyma cells?

A. To produce xylem sap

B. To store food and water

Correct C. To facilitate the transport of water and minerals

D. To produce xylem fibers

Correct Answer: C

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

Question 22

Which of the following is an example of a symbiotic relationship between two organisms?

A. Predator-prey relationship

Correct B. Mutualism between bees and flowers

C. Competition between two species

D. Commensalism between a bird and a tree

Correct Answer: B

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

Question 23

What is the primary function of the hypothalamus in the nervous system?

A. To regulate body temperature

Correct B. To control hunger and thirst

C. To regulate sleep and wakefulness

D. To control blood pressure

Correct Answer: B

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

Question 24

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

A. Mutation

B. Genetic drift

C. Natural selection

Correct D. Heritability

Correct Answer: D

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

Question 25

What is the primary function of the mitochondria in a cell?

Correct A. To produce ATP

B. To synthesize proteins

C. To store genetic information

D. To regulate cell growth

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