POST UTME CRAWFORD UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of pH on the growth of a particular species of bacteria. The researcher observes that the bacteria grow optimally at a pH of 7.0. What is the likely reason for this observation?
A. The bacteria have a pH-dep\endent enzyme that is active at pH 7.0
B. The bacteria have a pH-dep\endent transport protein that is active at pH 7.0
C. The bacteria have a pH-dep\endent membrane potential that is optimal at pH 7.0
D. The bacteria have a pH-dep\endent gene expression that is optimal at pH 7.0
Question 2
The process by which the body gets rid of waste products is known as
A. Excretion
B. Osmoregulation
C. Respiration
D. Photosynthesis
Question 3
A couple is trying to conceive a child. Which of the following reproductive strategies would be most effective for them?
A. In vitro fertilization
B. Intrauterine insemination
C. Artificial insemination
D. Natural conception
Question 4
In the context of sense organs, what is the primary function of the cochlea in the human ear?
A. To detect changes in air pressure
B. To transmit sound vibrations to the brain
C. To produce sound waves
D. To regulate body temperature
Question 5
A cell is placed in a hypotonic solution. What will happen to the cell?
A. The cell will shrink due to water loss
B. The cell will swell due to water uptake
C. The cell will remain unchanged
D. The cell will burst due to excessive water uptake
Question 6
A diagram of the human nervous system is shown below. Which of the following structures is responsible for transmitting signals from the brain to the muscles?
A. A
B. B
C. C
D. D
Question 7
In a typical terrestrial e\cosystem, what is the primary mechanism by which plants regulate water loss through transpiration?
A. Stomatal closure
B. Cuticular transpiration
C. Transpirational pull
D. Root pressure
Question 8
A diagram of a plant's transport system is shown below. What is the function of the xylem?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the rest of the plant
C. To regulate the amount of water lost through transpiration
D. To produce chlorophyll
Question 9
A diagram of a human eye is shown below. What is the function of the retina?
A. To detect light and transmit signals to the brain
B. To regulate the amount of light entering the eye
C. To produce tears for lubrication
D. To produce mucus for protection
Question 10
The process of cellular respiration can be divided into three main stages: glycolysis, the citric acid cycle, and
A. Photosynthesis
B. Fermentation
C. Oxidative phosphorylation
D. Mitosis
Question 11
The process by which plants convert light energy into chemical energy is known as
A. Respiration
B. Photosynthesis
C. Transpiration
D. Osmosis
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 homozygous dominant genotype 'AA'?
A. 0.16
B. 0.24
C. 0.36
D. 0.64
Question 13
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 consequence of this principle?
A. Genetic drift is a major force in evolution.
B. Mutation rates are influenced by the Hardy-Weinberg principle.
C. Genotype frequencies remain cons\tant in the absence of genetic drift.
D. The Hardy-Weinberg principle only applies to small populations.
Question 14
The process of osmoregulation involves the regulation of water and electrolyte balance in the body. Which of the following is a mechanism of osmoregulation?
A. The kidneys filter waste products from the blood.
B. The liver regulates electrolyte balance through the production of hormones.
C. The hypothalamus regulates thirst and hunger through the release of hormones.
D. The pancreas regulates blood sugar levels through the production of insulin.
Question 15
A species of plant is classified as belonging to the kingdom Plantae. Which of the following characteristics is most likely to be true about this species?
A. It has a cell wall made of chitin
B. It has a nucleus and mitochondria
C. It is autotrophic
D. It has flagella

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