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POST UTME CRAWFORD UNIVERSITY 2017 Biology | Objective

Are you preparing for POST UTME CRAWFORD UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 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 is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?

Correct A. 0.16

B. 0.24

C. 0.36

D. 0.64

Correct Answer: A

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Question 2

A plant cell has a cell wall, a large central vacuole, and a small nucleus. What is the primary function of the cell wall?

Correct A. To provide structural support

B. To regulate the movement of materials in and out of the cell

C. To synthesize proteins

D. To store genetic information

Correct Answer: A

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Question 3

A solution contains 0.1 M glu\cose and 0.2 M fructose. What is the total concentration of the solution?

A. 0.1 M

B. 0.2 M

Correct C. 0.3 M

D. 0.4 M

Correct Answer: C

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Question 4

A plant undergoes photosynthesis in the presence of light. What is the byproduct of this process?

Correct A. Glu\cose and oxygen

B. Glu\cose and carbon dioxide

C. Oxygen and carbon dioxide

D. Water and carbon dioxide

Correct Answer: A

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Question 5

A cell undergoes mitosis. What is the result of this process?

Correct A. Two daughter cells with the same number of chromosomes

B. Two daughter cells with a different number of chromosomes

C. One daughter cell with a different number of chromosomes

D. No change in the number of chromosomes

Correct Answer: A

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Question 6

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a consequence of this principle?

A. Genetic drift is a major force in evolution.

B. Mutation rates are influenced by the Hardy-Weinberg principle.

Correct C. Genotype frequencies remain cons\tant in the absence of genetic drift.

D. The Hardy-Weinberg principle only applies to small populations.

Correct Answer: C

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Question 7

In the context of excretion, what is the primary function of the kidneys?

A. To regulate blood pressure through the renin-angioten\sin system.

Correct B. To filter waste products from the blood.

C. To produce hormones that regulate electrolyte balance.

D. To maintain acid-base balance through the regulation of pH.

Correct Answer: B

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Question 8

The classification of living organisms is based on the following characteristics, EXCEPT:

A. Cellular structure

B. Metabolic processes

C. Genetic makeup

Correct D. Geographical distribution

Correct Answer: D

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Question 9

The process of osmoregulation involves the regulation of water and electrolyte balance in the body. Which of the following is a mechanism of osmoregulation?

A. The kidneys filter waste products from the blood.

B. The liver regulates electrolyte balance through the production of hormones.

Correct C. The hypothalamus regulates thirst and hunger through the release of hormones.

D. The pancreas regulates blood sugar levels through the production of insulin.

Correct Answer: C

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Question 10

The growth and development of an organism is influenced by the following factors, EXCEPT:

A. Genetics

B. Nutrition

C. Hormones

Correct D. Gravity

Correct Answer: D

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Question 11

In a typical terrestrial e\cosystem, what is the primary mechanism by which plants regulate water loss through transpiration?

Correct A. Stomatal closure

B. Cuticular transpiration

C. Transpirational pull

D. Root pressure

Correct Answer: A

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Question 12

A population of rabbits is introduced to a previously rabbit-free island. Assuming a cons\tant birth rate and no predation, what is the expected shape of the population growth curve?

A. Exponential growth

Correct B. Logistic growth

C. Sigmoid growth

D. Linear growth

Correct Answer: B

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Question 13

A researcher is studying the effect of pH on the growth of a particular species of bacteria. The researcher observes that the bacteria grow optimally at a pH of 7.0. What is the likely reason for this observation?

Correct A. The bacteria have a pH-dep\endent enzyme that is active at pH 7.0

B. The bacteria have a pH-dep\endent transport protein that is active at pH 7.0

C. The bacteria have a pH-dep\endent membrane potential that is optimal at pH 7.0

D. The bacteria have a pH-dep\endent gene expression that is optimal at pH 7.0

Correct Answer: A

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Question 14

A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?

A. Mitochondria

B. Chloroplast

C. Vacuole

Correct D. Nucleus

Correct Answer: D

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Question 15

A diagram of a simple e\cosystem is shown below. What is the likely effect of introducing a new predator to the e\cosystem?

A. The population of the producer will increase

B. The population of the herbivore will decrease

Correct C. The population of the predator will increase

D. The population of the decomposer will decrease

Correct Answer: C

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Question 16

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the

A. Spindle fibers

B. Centrioles

C. Telophase

Correct D. Prophase

Correct Answer: D

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Question 17

The process of cellular respiration can be divided into three main stages: glycolysis, the citric acid cycle, and

A. Photosynthesis

B. Fermentation

Correct C. Oxidative phosphorylation

D. Mitosis

Correct Answer: C

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Question 18

The diagram below shows the structure of a plant cell. Identify the part labeled A.

Correct A. Cell wall

B. Chloroplast

C. Vacuole

D. Mitochondria

Correct Answer: A

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Question 19

The Hardy-Weinberg principle states that the frequency of a gene in a population will remain cons\tant from generation to generation if

A. There is no mutation

B. There is no genetic drift

C. There is no gene flow

Correct D. All of the above

Correct Answer: D

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Question 20

The diagram below shows a simple black and white chemistry apparatus showing a titration setup. Identify the part labeled A.

Correct A. Burette

B. Conical flask

C. Dropping pipette

D. Thermometer

Correct Answer: A

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Question 21

In a tropical rainforest, the primary consumers are primarily composed of which of the following groups?

Correct A. Herbivorous insects

B. Fruit-eating birds

C. Small mammals

D. Large carnivorous mammals

Correct Answer: A

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Question 22

The process by which plants convert light energy into chemical energy is known as

A. Respiration

Correct B. Photosynthesis

C. Transpiration

D. Osmosis

Correct Answer: B

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Question 23

The rate of gas exchange in plants is influenced by

A. Temperature

B. Humidity

C. Light intensity

Correct D. All of the above

Correct Answer: D

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Question 24

The process by which the body gets rid of waste products is known as

Correct A. Excretion

B. Osmoregulation

C. Respiration

D. Photosynthesis

Correct Answer: A

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Question 25

The rate of digestion in the human body is influenced by

A. Temperature

B. pH

C. Enzyme concentration

Correct D. All of the above

Correct Answer: D

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