POST UTME SKYLINE UNIVERSITY 2018 Biology | Objective

Are you preparing for POST UTME SKYLINE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2018 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
In the process of osmoregulation, what is the primary mechanism by which the kidney regulates the concentration of ions in the blood?
Correct A. Active transport of ions across the renal tubular epithelium
B. Passive diffusion of ions through the renal tubular epithelium
C. Reabsorption of ions from the filtrate back into the bloodstream
D. Excretion of ions in the urine

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To re\fract light entering the eye
C. To regulate the amount of light entering the eye
D. To detect color

Correct Answer: A

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Question 3
In the process of photosynthesis, what is the overall equation for the conversion of light energy into chemical energy?
Correct A. \( 6CO_2 + 6H_2O + light energy \rightarrow C_6H_{12}O_6 + 6O_2 \)
B. \( 6CO_2 + 6H_2O + light energy \rightarrow C_6H_{12}O_6 + 3O_2 \)
C. \( 6CO_2 + 6H_2O + light energy \rightarrow C_6H_{12}O_6 + 12O_2 \)
D. \( 6CO_2 + 6H_2O + light energy \rightarrow C_6H_{12}O_6 + 9O_2 \)

Correct Answer: A

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Question 4
A diagram of the human respiratory system is shown below. What is the function of the part labeled 'B'?
Correct A. To exchange oxygen and carbon dioxide
B. To regulate the amount of air entering the lungs
C. To detect odors
D. To produce sound

Correct Answer: A

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Question 5
What is the primary mechanism by which the human body regulates its internal temperature?
A. Through the process of osmoregulation
Correct B. Through the process of thermoregulation
C. Through the process of respiration
D. Through the process of digestion

Correct Answer: B

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Question 6
The process of osmoregulation in organisms involves the regulation of water and solute balance across cell membranes. Which of the following is a primary mechanism of osmoregulation in plants?
A. Active transport of ions across the plasma membrane
B. Passive diffusion of water across the plasma membrane
Correct C. Regulation of stomatal aperture to control water loss
D. Production of turgor pressure to maintain cell shape

Correct Answer: C

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Question 7
The nervous system of an organism is responsible for transmitting and proces\sing information. Which of the following types of neurons is responsible for transmitting sensory information to the brain?
A. Motor neuron
Correct B. Sensory neuron
C. Interneuron
D. Glial cell

Correct Answer: B

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Question 8
The process of photosynthesis in plants involves the conversion of light energy into chemical energy. Which of the following is a byproduct of the light-dep\endent reactions in photosynthesis?
A. ATP
B. NADPH
Correct C. Oxygen
D. Glu\cose

Correct Answer: C

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Question 9
The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes is responsible for breaking down proteins into amino acids?
A. Amylase
B. Lipase
Correct C. Tryp\sin
D. Lactase

Correct Answer: C

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Question 10
The process of excretion in the human body involves the removal of waste products and excess subs\tances from the body. Which of the following organs is responsible for filtering waste products from the blood?
A. Liver
Correct B. Kidneys
C. Spleen
D. Pancreas

Correct Answer: B

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Question 11
In a population of 1000 individuals, 70% are heterozygous for the ABO blood group gene. If 20% of the population is type A, 30% is type B, and 50% is type AB, what is the genotype of the population?
Correct A. IAi
B. IBi
C. IAIA
D. IBIB

Correct Answer: A

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Question 12
A plant with the genotype RrSs is crossed with a plant with the genotype RRSS. What is the probability that the offspring will have the genotype RrSs?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 13
A cell is in the G2 phase of the cell cycle. If the cell is treated with a drug that prevents DNA replication, what will happen to the cell?
A. The cell will continue to grow and divide.
B. The cell will enter the G1 phase.
C. The cell will undergo apoptosis.
Correct D. The cell will be arrested in the G2 phase.

Correct Answer: D

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Question 14
A plant with the genotype RrSs is crossed with a plant with the genotype rrss. What is the probability that the offspring will have the genotype RrSs?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1

Correct Answer: B

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Question 15
A cell is in the S phase of the cell cycle. If the cell is treated with a drug that prevents DNA replication, what will happen to the cell?
A. The cell will continue to grow and divide.
B. The cell will enter the G1 phase.
C. The cell will undergo apoptosis.
Correct D. The cell will be arrested in the S phase.

Correct Answer: D

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Question 16
In the context of cell division, what is the primary function of the centrioles during the prophase stage of mitosis?
Correct A. To form the spindle fibers
B. To replicate the DNA
C. To condense the chromatin
D. To form the nuclear envelope

Correct Answer: A

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Question 17
A 25-year-old patient presents with symptoms of hypothyroidism. Which of the following hormones is most likely to be deficient?
Correct A. Thyroid-stimulating hormone (TSH)
B. Triiodothyronine (T3)
C. Thyroxine (T4)
D. Adrenaline

Correct Answer: A

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Question 18
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 19
A 35-year-old patient presents with symptoms of hypertension. Which of the following organs is most likely to be affected?
A. Heart
Correct B. Kidneys
C. Liver
D. Pancreas

Correct Answer: B

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Question 20
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling voluntary movements?
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord

Correct Answer: A

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Question 21
The diagram below shows a cross-section of a plant root. Identify the type of tissue labeled A.
Correct A. Xylem
B. Phloem
C. Cortex
D. Endodermis

Correct Answer: A

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Question 22
The Hardy-Weinberg principle states that the frequency of alleles in a population remains cons\tant from generation to generation. Which of the following is a necessary condition for this principle to hold?
A. Random mating
B. No mutation
C. No gene flow
Correct D. All of the above

Correct Answer: D

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Question 23
In a population of 1000 individuals, the frequency of the dominant allele is 0.6. What is the expected frequency of the recessive allele?
A. 0.2
Correct B. 0.3
C. 0.4
D. 0.5

Correct Answer: B

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Question 24
The diagram below shows a cross-section of a human brain. Identify the structure labeled B.
A. Cerebrum
Correct B. Cerebellum
C. Brainstem
D. Spinal cord

Correct Answer: B

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Question 25
The equation for the reaction between hydrogen peroxide and catalase is: \( 2H_2O_2 \rightarrow 2H_2O + O_2 \). What is the oxidation state of oxygen in the product O2?
A. -2
B. 0
Correct C. +2
D. +4

Correct Answer: C

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