POST UTME NILE UNIVERSITY 2017 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process of excretion in animals involves the removal of waste products from the body. Which of the following is a primary function of the kidneys in the excretory system?
A. To regulate body temperature
B. To remove waste products from the blood
C. To produce hormones that control growth and development
D. To maintain proper pH levels in the body
Question 2
A patient is diagnosed with a genetic disorder that affects the production of a specific enzyme. Which of the following is the primary consequence of this disorder?
A. The patient will experience a deficiency in the production of the enzyme.
B. The patient will experience an overproduction of the enzyme.
C. The patient will experience a mutation in the gene that codes for the enzyme.
D. The patient will experience a deletion of the gene that codes for the enzyme.
Question 3
In a tropical rainforest, what is the primary source of energy for the e\cosystem?
A. Decomposers
B. Herbivores
C. Primary producers
D. Omnivores
Question 4
In the context of coordination, what is the primary function of the hypothalamus in regulating body temperature?
A. The hypothalamus regulates body temperature by controlling the rate of heat loss from the body.
B. The hypothalamus regulates body temperature by controlling the rate of heat production in the body.
C. The hypothalamus regulates body temperature by controlling the rate of sweating.
D. The hypothalamus regulates body temperature by controlling the rate of shivering.
Question 5
The human eye is a complex sensory organ that allows us to perceive the world around us. Which of the following is a function of the retina in the human eye?
A. To focus light onto the lens
B. To convert light into electrical signals
C. To regulate the amount of light entering the eye
D. To produce tears to lubricate the eye
Question 6
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. 1/4
B. 1/2
C. 3/4
D. 1
Question 7
A population of rabbits is growing \logistically according to the equation \( \frac{dP}{dt} = rPleft\( 1 - \frac{P}{K}\right \ \) ). If the initial population is 100 and the carrying capacity is 1000, find the population at time t = 5.
A. 500
B. 750
C. 900
D. 950
Question 8
A 0.1 M solution of NaOH is mixed with a 0.1 M solution of HCl. What is the pH of the resulting solution?
A. 1
B. 2
C. 7
D. 14
Question 9
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. Calculate the pressure of the gas u\sing the ideal gas law.
A. 1.01 x 10^5 Pa
B. 2.02 x 10^5 Pa
C. 3.03 x 10^5 Pa
D. 4.04 x 10^5 Pa
Question 10
In the context of evolutionary theory, what is the primary mechanism by which natural selection acts on a population?
A. Genetic drift
B. Mutation
C. Gene flow
D. Differential reproduction
Question 11
A 50-g sample of a subs\tance is found to have a mass of 25 g after being placed in a vacuum. What is the density of the subs\tance?
A. 0.5 g/cm^3
B. 1.0 g/cm^3
C. 1.5 g/cm^3
D. 2.0 g/cm^3
Question 12
What is the primary function of the hypothalamus in the human brain?
A. To regulate body temperature
B. To control hunger and thirst
C. To facilitate sleep and wakefulness
D. To regulate emotions
Question 13
A patient is diagnosed with a bacterial infection that is resis\tant to multiple antibiotics. Which of the following is the most likely mechanism of resis\tance?
A. The bacteria have developed a mutation in the target enzyme that makes it less susceptible to the antibiotic.
B. The bacteria have developed a efflux pump that removes the antibiotic from the cell.
C. The bacteria have developed a modified target that makes it less accessible to the antibiotic.
D. The bacteria have developed a mechanism to inactivate the antibiotic.
Question 14
What is the process by which plants convert light energy into chemical energy?
A. Photosynthesis
B. Respiration
C. Transpiration
D. Evaporation
Question 15
In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant plant life. However, some primary consumers are carnivores that feed on other primary consumers. Which of the following is an example of a carnivorous primary consumer in a tropical rainforest e\cosystem?
A. A snake that feeds on a lizard
B. A lizard that feeds on a leafy green plant
C. A bird that feeds on a nectar-rich flower
D. A spider that feeds on a fly

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