POST UTME KSU 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of Drosophila melanogaster is being studied for its genetic variation. The population has a mean wing length of 2.5 cm and a s\tandard deviation of 0.5 cm. If a sample of 100 flies is taken from the population, what is the probability that the sample mean wing length will be greater than 2.8 cm?
A. 0.01
B. 0.05
C. 0.10
D. 0.20
Question 2
In a tropical rainforest e\cosystem, the primary producers are plants that undergo photosynthesis. Which of the following is a characteristic of the photosynthetic process?
A. The release of oxygen as a byproduct
B. The absorption of carbon dioxide
C. The release of water vapor
D. The absorption of sunlight
Question 3
A researcher is studying the effect of temperature on the rate of photosynthesis in plants. The graph below shows the relationship between temperature and rate of photosynthesis.
A. The rate of photosynthesis is highest at 20°C.
B. The rate of photosynthesis is highest at 30°C.
C. The rate of photosynthesis is highest at 40°C.
D. The rate of photosynthesis is highest at 50°C.
Question 4
The Hardy-Weinberg principle states that allele 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 5
A population of rabbits has a birth rate of 0.05 and a death rate of 0.02. What is the growth rate of the population?
A. 0.03
B. 0.05
C. 0.07
D. 0.09
Question 6
A population of bacteria is growing exponentially according to the equation \( P(t) = P_0 e^{rt} \). If the initial population is 100 and the growth rate is 0.2, what is the population after 5 years?
A. 1000
B. 1488.41
C. 2000
D. 3000
Question 7
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. 0.48
D. 0.72
Question 8
In the process of osmoregulation, what is the primary function of the kidneys in a hypertonic environment?
A. To excrete excess water
B. To reabsorb excess ions
C. To produce antidiuretic hormone
D. To regulate blood pressure
Question 9
A plant has a mutation that causes it to produce a flower with 5 petals. If the plant is self-pollinated, what is the probability that the offspring will have 5 petals?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 10
A 2.0 M solution of NaOH is being titrated with a 1.0 M solution of HCl. If 25 mL of HCl is added to 25 mL of NaOH, what is the pH of the resulting solution?
A. 1.0
B. 2.0
C. 3.0
D. 4.0
Question 11
The process of cellular respiration involves the breakdown of glu\cose to produce energy in the form of ATP. Which of the following is a stage of cellular respiration?
A. Glycolysis
B. Citric acid cycle
C. Electron transport chain
D. Fermentation
Question 12
A plant cell is placed in a solution with a higher concentration of solutes than the cell's cytoplasm. What will happen to the cell?
A. The cell will gain water and swell
B. The cell will lose water and shrink
C. The cell will remain unchanged
D. The cell will burst
Question 13
A population of rabbits is growing \logistically according to the equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the initial population is 100 and the carrying capacity is 1000, what is the population after 5 years?
A. 500
B. 783.33
C. 1000
D. 2000
Question 14
A genetic trait is controlled by a \single gene with two alleles. If the dominant allele is represented by the letter 'R' and the recessive allele is represented by the letter 'r', what is the genotype of an individual that is homozygous dominant?
A. RR
B. Rr
C. rr
D. RrRr
Question 15
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.2 per hour, what is the population size after 5 hours?
A. 1000
B. 2000
C. 4000
D. 8000

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