Practice post utme unilag biology 2023 Past Questions

Question 1

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. 0.16

D. 0.04

Correct Answer: A

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

Question 2

A diagram of the human circulatory system is shown below. Which of the following structures is responsible for the regulation of blood pressure?

Correct A. Aorta

B. Pulmonary artery

C. Carotid artery

D. Renal artery

Correct Answer: A

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

Question 3

A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If 1.0 mol of the gas is added to the flask, what is the new pressure?

A. 1.5 atm

B. 2.0 atm

Correct C. 2.5 atm

D. 3.0 atm

Correct Answer: C

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

Question 4

A diagram of a titration setup is shown below. What is the purpose of the burette?

Correct A. To measure the volume of the titrant

B. To measure the volume of the analyte

C. To mix the titrant and analyte

D. To measure the pH of the solution

Correct Answer: A

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

Question 5

A 5.0 L flask contains 0.5 mol of an ideal gas at 27°C. If the gas is compressed to 2.0 L, what is the new pressure?

A. 1.5 atm

B. 2.0 atm

Correct C. 3.0 atm

D. 4.0 atm

Correct Answer: C

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

Question 6

In the context of eco\logy, what is the primary difference between a biome and a habitat?

Correct A. A biome is a larger geographic area that encompasses multiple habitats.

B. A habitat is a smaller geographic area that is home to a specific species or community.

C. A biome is a specific type of e\cosystem, while a habitat is a general term for any environment.

D. A biome is a type of vegetation, while a habitat is a type of animal community.

Correct Answer: A

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

Question 7

What is the process by which microorganisms break down organic matter in the absence of oxygen?

A. Fermentation

B. Putrefaction

Correct C. Decomposition

D. Saprotrophy

Correct Answer: C

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

Question 8

What is the term for the movement of water through a plant, from the roots to the leaves, and is then released into the air as water vapor?

Correct A. Transpiration

B. Translocation

C. Diffusion

D. Osmosis

Correct Answer: A

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

Question 9

What is the term for the process by which cells divide and grow, resulting in an increase in the number of cells?

Correct A. Mitosis

B. Meiosis

C. Cell division

D. Cell growth

Correct Answer: A

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

Question 10

What is the term for the study of the structure, behavior, and evolution of the universe?

A. Astronomy

B. Astrophysics

Correct C. Cosmo\logy

D. Geo\logy

Correct Answer: C

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 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.04

Correct Answer: A

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

Question 12

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

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

Question 13

A population of rabbits has a birth rate of 0.05 and a death rate of 0.01. What is the net reproductive rate (R0) of the population?

Correct A. 0.04

B. 0.06

C. 0.08

D. 0.1

Correct Answer: A

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

Question 14

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. 0.5

B. 0.75

C. 0.9

D. 0.95

Correct Answer: A

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

Question 15

A population of bacteria has a growth rate of 0.05 and a carrying capacity of 1000. What is the population size at equilibrium?

A. 500

B. 750

Correct C. 1000

D. 1250

Correct Answer: C

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

Question 16

In a tropical rainforest, the primary consumers are primarily herbivores. Which of the following is a characteristic of the primary consumers in this e\cosystem?

Correct A. They have a high metabolic rate

B. They are primarily carnivores

C. They have a low reproductive rate

D. They are primarily detritivores

Correct Answer: A

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

Question 17

A cell is placed in a hypertonic solution. What happens to the cell?

A. The cell shrinks

Correct B. The cell swells

C. The cell remains unchanged

D. The cell bursts

Correct Answer: B

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

Question 18

A population of rabbits is growing exponentially. If the initial population is 100 and the growth rate is 20% per year, what is the population after 5 years?

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 19

A species of bird has a unique adaptation that allows it to survive in a desert environment. Which of the following is a characteristic of this adaptation?

A. It has a large beak

B. It has a specialized kidney

Correct C. It has a unique feather structure

D. It has a large liver

Correct Answer: C

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

Question 20

A cell is placed in a hypotonic solution. What happens to the cell?

A. The cell shrinks

Correct B. The cell swells

C. The cell remains unchanged

D. The cell bursts

Correct Answer: B

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

Question 21

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. Which of the following eco\logical processes is most likely responsible for this phenomenon?

A. Predation

Correct B. Competition

C. Mutualism

D. Commensalism

Correct Answer: B

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

Question 22

A species of bird has a unique mating ritual where the male performs a complex dance to attract a female. Which of the following reproductive strategies is most likely being employed by this species?

A. Asexual reproduction

Correct B. Sexual reproduction

C. Parthenogenesis

D. Apomixis

Correct Answer: B

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

Question 23

A plant has a xylem tissue that is responsible for transporting water and minerals from the roots to the leaves. Which of the following structures is most likely responsible for the transport of water and minerals in this plant?

A. Tracheids

Correct B. Vessel elements

C. Xylem parenchyma

D. Fibers

Correct Answer: B

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

Question 24

A species of fish has a unique adaptation that allows it to survive in a environment with low oxygen levels. Which of the following evolutionary theories is most likely responsible for the development of this adaptation?

Correct A. Natural selection

B. Genetic drift

C. Gene flow

D. Mutation

Correct Answer: A

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

Question 25

A species of plant has a unique life cycle that involves the production of spores. Which of the following reproductive strategies is most likely being employed by this species?

Correct A. Asexual reproduction

B. Sexual reproduction

C. Parthenogenesis

D. Apomixis

Correct Answer: A

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

POST UTME UNILAG 2023 Biology | Objective

Master the Exam!

Help others prepare! Share this practice hub: