POST UTME MOUNTAIN TOP UNIVERSITY 2021 Biology | Objective

Are you preparing for POST UTME MOUNTAIN TOP UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2021 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In a population of 1000 bacteria, 80% are resis\tant to antibiotic A. If 200 bacteria are randomly selected and 60 are resis\tant to antibiotic A, what is the probability that a randomly selected bacterium from the original population is resis\tant to antibiotic A?
Correct A. 0.8
B. 0.7
C. 0.6
D. 0.5

Correct Answer: A

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Question 2
A 2.5 L flask contains 0.5 M NaOH. If 25 mL of 1.5 M HCl is slowly added to the flask, what is the concentration of the resulting solution?
Correct A. 0.75 M
B. 0.5 M
C. 0.25 M
D. 0.125 M

Correct Answer: A

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Question 3
A plant grows from a seed in a controlled environment. The plant's height (in cm) is measured at regular intervals. The data is shown below:\n\n| Time (days) | Height (cm) |\n| --- | --- |\n| 0 | 0 |\n| 1 | 2 |\n| 2 | 4 |\n| 3 | 6 |\n| 4 | 8 |\n| 5 | 10 |\n\nWhat is the rate of growth of the plant?
Correct A. 2 cm/day
B. 1.5 cm/day
C. 1 cm/day
D. 0.5 cm/day

Correct Answer: A

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Question 4
A 50 mL sample of a solution containing 0.5 M NaCl is added to a 100 mL sample of a solution containing 0.2 M NaOH. What is the concentration of the resulting solution?
A. 0.25 M
Correct B. 0.5 M
C. 0.75 M
D. 1 M

Correct Answer: B

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Question 5
A 2.5 L flask contains 0.5 M NaOH. If 25 mL of 1.5 M HCl is slowly added to the flask, what is the concentration of the resulting solution?
Correct A. 0.75 M
B. 0.5 M
C. 0.25 M
D. 0.125 M

Correct Answer: A

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Question 6
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
B. To produce NADH and FADH2 from the citric acid cycle
Correct C. To pump protons across the mitochondrial inner membrane, creating a proton gradient
D. To reduce oxygen to water

Correct Answer: C

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Question 7
A researcher is studying the effects of pH on enzyme activity. Which of the following enzymes is most likely to be affected by a change in pH?
A. Amylase
B. Lactase
Correct C. Pep\sin
D. Tryp\sin

Correct Answer: C

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Question 8
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
Correct A. To exchange oxygen and carbon dioxide with the environment
B. To filter dust and other particles from the air
C. To produce surfac\tant to reduce surface tension
D. To regulate body temperature

Correct Answer: A

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Question 9
A researcher is studying the effects of exercise on muscle growth. Which of the following hormones is most likely to be involved in this process?
A. Insulin
B. Glucagon
Correct C. Growth hormone
D. Adrenaline

Correct Answer: C

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Question 10
A diagram of the human excretory system is shown below. What is the primary function of the kidneys?
Correct A. To filter waste products from the blood
B. To regulate body temperature
C. To produce hormones that stimulate growth
D. To produce urine

Correct Answer: A

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Question 11
In asexual reproduction, which of the following organisms can reproduce without the involvement of gametes?
Correct A. Bacteria
B. Fungi
C. Plants
D. Animals

Correct Answer: A

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Question 12
What is the primary function of the mitochondria in a cell?
A. Protein synthesis
B. Cell signaling
Correct C. Energy production
D. Cell division

Correct Answer: C

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Question 13
In the water cycle, what is the process by which water is transferred from the land to the atmosphere?
Correct A. Evaporation
B. Condensation
C. Runoff
D. Infiltration

Correct Answer: A

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Question 14
What is the term for the process by which plants convert light energy from the sun into chemical energy?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation

Correct Answer: A

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Question 15
In the cell cycle, what is the stage where the cell prepares for division?
A. G1 phase
B. S phase
Correct C. G2 phase
D. Mitosis

Correct Answer: C

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Question 16
In a population of 1000 individuals, 200 are infected with a disease. If the disease is caused by a bacterium that can be transmitted through direct contact, and the rate of transmission is 0.05 per day, what is the expected number of new infections after 10 days?
A. 100
B. 200
Correct C. 300
D. 400

Correct Answer: C

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Question 17
A 2-year-old child is brought to the hospital with symptoms of pneumonia. The child's white blood cell count is 20,000 cells per microliter. Which of the following is the most likely cause of the child's symptoms?
Correct A. Bacterial pneumonia
B. Viral pneumonia
C. Fungal pneumonia
D. Parasitic pneumonia

Correct Answer: A

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Question 18
A researcher is studying the effect of a new antibiotic on a bacterial population. The researcher finds that the population grows exponentially at first, but then slows down and eventually reaches a plateau. What is the most likely explanation for this phenomenon?
Correct A. The bacteria are adapting to the antibiotic
B. The antibiotic is not effective against the bacteria
C. The bacteria are dying off due to the antibiotic
D. The bacteria are growing in a new environment

Correct Answer: A

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Question 19
A 30-year-old woman is diagnosed with breast cancer. The cancer is found to be estrogen receptor-positive. Which of the following treatments is most likely to be effective?
A. Surgery
B. Chemotherapy
Correct C. Hormone therapy
D. Radiation therapy

Correct Answer: C

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Question 20
A 40-year-old man is diagnosed with type 2 diabetes. His blood glu\cose level is 250 mg/dL. Which of the following medications is most likely to be prescribed?
Correct A. Metformin
B. Sulfonylurea
C. Pioglitazone
D. Insulin

Correct Answer: A

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Question 21
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the flower color, 20% are homozygous dominant, and 10% are homozygous recessive. What is the genotype of the individual that is homozygous recessive?
A. RR
B. Rr
Correct C. rr
D. RR

Correct Answer: C

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Question 22
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7.0. What is the likely reason for this observation?
Correct A. The microorganism is a bacterium that thrives in neutral pH.
B. The microorganism is a fungus that grows best in acidic conditions.
C. The microorganism is a protozoan that requires a slightly alkaline environment.
D. The microorganism is a virus that is inactivated in acidic conditions.

Correct Answer: A

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Question 23
A diagram shows a plant with a \single cotyledon. What is the likely type of plant?
A. Dicotyledonous plant
Correct B. Monocotyledonous plant
C. Gymnosperm
D. Angiosperm

Correct Answer: B

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Question 24
A diagram shows a simple harmonic motion. What is the likely type of motion?
Correct A. Simple harmonic motion
B. Damped harmonic motion
C. Forced harmonic motion
D. Oscillatory motion

Correct Answer: A

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Question 25
A diagram shows a titration setup. What is the likely purpose of the setup?
Correct A. To determine the concentration of a solution
B. To determine the pH of a solution
C. To determine the volume of a solution
D. To determine the temperature of a solution

Correct Answer: A

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