POST UTME MOUNTAIN TOP UNIVERSITY 2020 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. 0.16
D. 0.04
Question 2
In a xylem vessel, what is the primary function of the lignin in the cell walls?
A. To provide structural support to the vessel
B. To regulate water transport through the vessel
C. To facilitate the movement of minerals and nutrients
D. To seal the vessel and prevent water loss
Question 3
In a tropical rainforest, the primary consumers are herbivores that feed on the producers. What is the role of these herbivores in the e\cosystem?
A. Decomposers
B. Primary producers
C. Secondary consumers
D. Tertiary consumers
Question 4
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells is called
A. Mitosis
B. Meiosis
C. Binary Fission
D. Endoreduplication
Question 5
A population of rabbits is growing according to the \logistic growth model. If the carrying capacity is 1000 individuals and the initial population is 100, what is the population size after 5 generations?
A. 500
B. 750
C. 900
D. 950
Question 6
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. No mutation
C. No gene flow
D. No natural selection
Question 7
In a desert e\cosystem, a cactus plant has adapted to store water in its stems. Which of the following is a consequence of this adaptation?
A. Increased water loss through transpiration
B. Enhanced photosynthesis
C. Reduced water storage capacity
D. Increased water absorption from the soil
Question 8
A person with a visual impairment is unable to see objects in their peripheral vision. Which of the following sense organs is responsible for detecting peripheral vision?
A. Retina
B. Optic nerve
C. Cornea
D. Macula
Question 9
A population of a species is found to have a mean height of 1.8 meters with a s\tandard deviation of 0.2 meters. If a random sample of 25 individuals is taken from this population, what is the probability that the sample mean height will be greater than 1.9 meters?
A. 0.05
B. 0.01
C. 0.005
D. 0.0005
Question 10
The process by which an organism's genetic information is passed from one generation to the next is called
A. Mutation
B. Genetic Drift
C. Gene Flow
D. Heritability
Question 11
A plant has a root system that is adapted to absorb water from the soil. Which of the following structures is responsible for the absorption of water by the root system?
A. A
B. B
C. C
D. D
Question 12
In a population of rabbits, the frequency of the dominant allele is 0.6. What is the frequency of the recessive allele?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 13
The diagram below shows a cross-section of a plant root. What is the function of the part labeled A?
A. To absorb water and minerals from the soil
B. To transport water and minerals from the roots to the leaves
C. To transport sugars and other organic compounds from the leaves to the rest of the plant
D. To store food and water for the plant
Question 14
The process by which plants convert light energy into chemical energy is called
A. Respiration
B. Photosynthesis
C. Decomposition
D. Fermentation
Question 15
A neuron fires an action potential when the threshold potential is reached. What is the threshold potential?
A. +30mV
B. +50mV
C. +70mV
D. +90mV

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