POST UTME NOUN 2019 Biology | Objective

Are you preparing for POST UTME NOUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
Correct A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH

Correct Answer: A

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Question 2
A cell is placed in a solution with a concentration of 0.1 M glu\cose. What is the probability that the cell will take up glu\cose through facilitated diffusion?
A. 0.1
Correct B. 0.5
C. 0.9
D. 1.0

Correct Answer: B

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Question 3
A diagram of a plant cell is shown below. Identify the part labeled A.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 4
A population of bacteria is growing exponentially. If the initial population is 100 and the growth rate is 0.2 per hour, what is the population after 5 hours?
A. 1000
B. 2000
Correct C. 5000
D. 10000

Correct Answer: C

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Question 5
A genetic cross is performed between two true-breeding lines of pea plants. One line has green pods and the other line has yellow pods. What is the probability that the offspring will have green pods?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 6
In a population of 1000 bacteria, 80% are resis\tant to penicillin. If 200 bacteria are randomly selected for treatment, what is the probability that at least 150 will be resis\tant to penicillin?
A. 0.25
B. 0.30
Correct C. 0.35
D. 0.40

Correct Answer: C

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Question 7
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of gas is added to the flask, what is the new pressure?
A. 101325 Pa
Correct B. 1013250 Pa
C. 10132500 Pa
D. 101325000 Pa

Correct Answer: B

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Question 8
A plant cell has a vacuole with a volume of 10 μm³ and a concentration of 0.5 M. If the cell membrane is permeable to water, what is the rate of water influx?
A. 1.0 × 10⁻¹⁰ m³/s
B. 1.0 × 10⁻⁹ m³/s
Correct C. 1.0 × 10⁻⁸ m³/s
D. 1.0 × 10⁻⁷ m³/s

Correct Answer: C

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Question 9
A 50-year-old woman has a 5-year history of hypertension. She is currently taking 10 mg of li\sinopril daily. What is the expected effect of this medication on her blood pressure?
A. Decrease by 10 mmHg
B. Decrease by 20 mmHg
Correct C. Decrease by 30 mmHg
D. No change

Correct Answer: C

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Question 10
A 30-year-old man has a 10-year history of type 2 diabetes. He is currently taking 50 mg of metformin daily. What is the expected effect of this medication on his blood glu\cose levels?
A. Decrease by 10 mg/dL
Correct B. Decrease by 20 mg/dL
C. Decrease by 30 mg/dL
D. No change

Correct Answer: B

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Question 11
In a typical plant cell, the process of photosynthesis occurs in the following organelle:
A. Mitochondria
Correct B. Chloroplast
C. Nucleus
D. Vacuole

Correct Answer: B

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Question 12
The hormone responsible for regulating the reproductive cycle in females is:
A. Insulin
B. Ghrelin
Correct C. Estrogen
D. Progesterone

Correct Answer: C

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Question 13
The process by which the body gets rid of waste products and excess subs\tances is called:
A. Respiration
B. Photosynthesis
Correct C. Excretion
D. Osmosis

Correct Answer: C

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Question 14
The sense organ responsible for detecting changes in light intensity is:
Correct A. Eye
B. Ear
C. Nose
D. Skin

Correct Answer: A

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Question 15
The process by which the body gets rid of excess heat is called:
A. Respiration
B. Photosynthesis
Correct C. Evaporation
D. Osmosis

Correct Answer: C

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Question 16
The hormone responsible for regulating the growth and development of the body is:
A. Insulin
B. Ghrelin
Correct C. Growth Hormone
D. Adrenaline

Correct Answer: C

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Question 17
The process by which the body gets rid of waste products through the kidneys is called:
A. Respiration
B. Photosynthesis
Correct C. Excretion
D. Osmosis

Correct Answer: C

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Question 18
The sense organ responsible for detecting changes in sound waves is:
A. Eye
Correct B. Ear
C. Nose
D. Skin

Correct Answer: B

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Question 19
The process by which the body gets rid of excess water is called:
A. Respiration
B. Photosynthesis
C. Osmosis
Correct D. Evaporation

Correct Answer: D

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Question 20
The hormone responsible for regulating the reproductive cycle in males is:
A. Insulin
B. Ghrelin
Correct C. Testosterone
D. Progesterone

Correct Answer: C

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Question 21
The process by which the body gets rid of excess heat through sweating is called:
A. Respiration
B. Photosynthesis
Correct C. Evaporation
D. Osmosis

Correct Answer: C

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Question 22
In the context of hormonal coordination, what is the primary function of the hypothalamus in regulating body temperature?
A. To produce hormones that stimulate the thyroid gland
B. To regulate the pituitary gland's secretion of hormones
Correct C. To maintain a stable body temperature through negative feedback mechanisms
D. To stimulate the adrenal glands to produce hormones

Correct Answer: C

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Question 23
A researcher studying the xylem transport system in plants observes that the rate of water transport is affected by the concentration of solutes in the xylem sap. What is the primary mechanism responsible for this phenomenon?
Correct A. Osmosis
B. Diffusion
C. Active transport
D. Passive transport

Correct Answer: A

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Question 24
In a forest e\cosystem, a decrease in the population of a key herbivore species leads to an increase in the population of a competing plant species. What is the most likely explanation for this phenomenon?
A. Predation pressure
Correct B. Competition for resources
C. Mutualism
D. Commensalism

Correct Answer: B

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Question 25
A bio\logist studying the classification of living organisms observes that a particular species exhibits characteristics of both plants and animals. What is the most likely classification for this species?
Correct A. Protista
B. Fungi
C. Monera
D. Bacteria

Correct Answer: A

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