POST UTME SKYLINE UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

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'?
A. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 2
The diagram below shows a cross-section of a plant root. Identify the type of tissue labeled A.
A. Xylem
B. Phloem
C. Cortex
D. Endodermis
Question 3
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
C. +2
D. +4
Question 4
A diagram of the human respiratory system is shown below. Which part of the system is responsible for exchanging oxygen and carbon dioxide?
A. Trachea
B. Bronchi
C. Alveoli
D. Diaphragm
Question 5
In the process of osmoregulation, what is the primary mechanism by which the kidney regulates the concentration of ions in the blood?
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
Question 6
A diagram of the human eye is shown below. What is the function of the part labeled 'C'?
A. To focus light onto the retina
B. To re\fract light entering the eye
C. To detect light intensity
D. To regulate pupil size
Question 7
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
C. Oxygen
D. Glu\cose
Question 8
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
C. Regulation of stomatal aperture to control water loss
D. Production of turgor pressure to maintain cell shape
Question 9
In the process of photosynthesis, what is the overall equation for the conversion of light energy into chemical energy?
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. \( 6CO_2 + 6H_2O + light energy \rightarrow C_6H_{12}O_6 + 9O_2 \)
Question 10
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?
A. IAi
B. IBi
C. IAIA
D. IBIB
Question 11
A 35-year-old patient presents with symptoms of hypertension. Which of the following organs is most likely to be affected?
A. Heart
B. Kidneys
C. Liver
D. Pancreas
Question 12
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 heterozygous genotype 'Aa'?
A. 0.36
B. 0.64
C. 0.72
D. 0.84
Question 13
A diagram of the human brain is shown below. Which part of the brain is responsible for controlling voluntary movements?
A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord
Question 14
What is the primary mechanism by which the human body regulates its internal temperature?
A. Through the process of osmoregulation
B. Through the process of thermoregulation
C. Through the process of respiration
D. Through the process of digestion
Question 15
The diagram below shows a cross-section of a human brain. Identify the structure labeled B.
A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord

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