POST UTME MOUNTAIN TOP UNIVERSITY 2019 Biology | Objective

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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. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

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Question 2
A diagram of the human brain is shown below. Identify the part labeled 'A'.
Correct A. Cerebrum
B. Cerebellum
C. Brainstem
D. Frontal Lobe

Correct Answer: A

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Question 3
A solution of 0.1 M NaCl is prepared by dissolving 5.84 g of NaCl in 1 L of water. What is the concentration of the solution in mol/L?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 4
A diagram of the human heart is shown below. Identify the part labeled 'B'.
A. Left Ventricle
Correct B. Right Ventricle
C. Left Atrium
D. Right Atrium

Correct Answer: B

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Question 5
A diagram of the human eye is shown below. Identify the part labeled 'C'.
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 6
The process of chemosynthesis in certain microorganisms involves the conversion of carbon dioxide and water into organic compounds u\sing energy derived from the oxidation of inorganic subs\tances. Which of the following microorganisms is an example of a chemosynthetic organism?
A. Bacteria
Correct B. Archaea
C. Fungi
D. Protists

Correct Answer: B

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Question 7
In the xylem, the primary function of the tracheids is to transport water and minerals from the roots to the leaves. What is the characteristic feature of tracheids that allows them to perform this function?
A. Thick cell walls
B. Lack of pits
Correct C. Presence of pits
D. Perforated walls

Correct Answer: C

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Question 8
The theory of evolution by natural selection proposes that populations of organisms adapt to their environments through the process of variation, mutation, genetic drift, and gene flow. Which of the following is an example of genetic drift?
A. Mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 9
In the e\cosystem of a tropical rainforest, the primary producers are the plants and algae that undergo photosynthesis to produce organic compounds. What is the role of the decomposers in this e\cosystem?
A. Primary consumers
Correct B. Decomposers
C. Secondary consumers
D. Tertiary consumers

Correct Answer: B

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Question 10
The process of mitosis in eukaryotic cells involves the replication of DNA and the separation of chromosomes into two daughter cells. What is the primary function of the centrioles in this process?
Correct A. To form the spindle fibers
B. To replicate the DNA
C. To separate the chromosomes
D. To form the nuclear envelope

Correct Answer: A

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Question 11
The nervous system's coordination of muscle contraction and relaxation is primarily achieved through the
A. release of neurotransmitters
B. depolarization of muscle fibers
C. action potentials in motor neurons
Correct D. synaptic transmission at neuromuscular junctions

Correct Answer: D

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Question 12
The process of osmoregulation in animals involves the regulation of
Correct A. water and electrolyte balance
B. ion concentration in cells
C. blood pressure and blood volume
D. body temperature and pH levels

Correct Answer: A

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Question 13
The xylem transport system in plants is responsible for the movement of
Correct A. water and minerals from roots to leaves
B. sugars and amino acids from leaves to roots
C. hormones and growth regulators from roots to shoots
D. wastes and excess ions from leaves to roots

Correct Answer: A

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Question 14
The sense organ responsible for detecting changes in sound waves is the
A. eye
Correct B. ear
C. nose
D. tongue

Correct Answer: B

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Question 15
The evolutionary theory of natural selection proposes that
Correct A. organisms with favorable traits will survive and reproduce
B. organisms with unfavorable traits will die off and be replaced
C. organisms will adapt to their environment through genetic drift
D. organisms will evolve through mutation and genetic recombination

Correct Answer: A

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