POST UTME NILE UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A researcher is studying the effect of temperature on the growth of a microorganism. Which of the following statements about microbial growth is TRUE?
A. The growth rate of a microorganism is directly proportional to the temperature.
B. The growth rate of a microorganism is inversely proportional to the temperature.
C. The growth rate of a microorganism is unaffected by the temperature.
D. The growth rate of a microorganism is maximum at a temperature of 20°C.
Question 2
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic recombination
B. Mutation
C. Gene flow
D. Genetic drift
Question 3
In the process of osmoregulation, the kidneys play a crucial role in maintaining the balance of ions and water in the body. Which of the following best describes the mechanism by which the kidneys regulate the concentration of ions in the blood?
A. The kidneys filter the blood and excrete excess ions in the urine.
B. The kidneys reabsorb ions from the filtrate back into the bloodstream.
C. The kidneys produce hormones that regulate ion balance in the body.
D. The kidneys do not play a direct role in regulating ion balance in the body.
Question 4
A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing most of the water and electrolytes from the chyme?
A. Stomach
B. Small intestine
C. Large intestine
D. Liver
Question 5
A population of rabbits is growing according to the \logistic growth equation: dP/dt = rP\( 1 - P/K \). If the initial population is 100 and the carrying capacity is 1000, what is the population after 5 years?
A. 200
B. 500
C. 800
D. 1000
Question 6
A diagram of a human eye is shown below. What is the function of the retina?
A. B\ending of light
B. Detection of light
C. Production of tears
D. Regulation of pupil size
Question 7
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 8
A diagram of the human brain is shown below. What is the function of the structure labeled 'A'?
A. To regulate body temperature
B. To control blood pressure
C. To facilitate sensory perception
D. To coordinate motor functions
Question 9
In the xylem, water and minerals are transported from the roots to the leaves through a process called the
A. transpiration stream
B. osmotic gradient
C. capillary action
D. root pressure
Question 10
The diagram below shows a cross-section of the human eye. Which part of the eye is responsible for detecting light and color?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 11
The process of evolution that occurs when a new species emerges from a \single individual is called?
A. Speciation
B. Adaptation
C. Mutation
D. Genetic Drift
Question 12
A solution of glu\cose is titrated with a solution of potassium dichromate. The reaction is as follows: C6H12O6 + 12Cr2O72- → 6CO2 + 24Cr3+ + 18H2O. If 25.0 mL of 0.100 M glu\cose solution requires 35.0 mL of 0.0500 M potassium dichromate solution for titration, what is the concentration of glu\cose in the solution?
A. 0.0500 M
B. 0.0750 M
C. 0.100 M
D. 0.125 M
Question 13
In a photosynthetic pathway, what is the primary function of the enzyme RuBisCO?
A. Fixation of CO2
B. Reduction of NADP+
C. Regeneration of RuBP
D. Oxidation of NADPH
Question 14
A genetic disorder caused by a mutation in the BRCA1 gene increases the risk of developing which type of cancer?
A. Breast cancer
B. Ovarian cancer
C. Colorectal cancer
D. Prostate cancer
Question 15
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'R'?
A. 0.8
B. 0.6
C. 0.4
D. 0.2

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