POST UTME SUMMIT UNIVERSITY 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A plant has a root system with a total surface area of 100 cm². If the plant is placed in a solution with a concentration of 0.1 M, what is the rate of water uptake by the plant?
A. 0.01 cm³/s
B. 0.02 cm³/s
C. 0.03 cm³/s
D. 0.04 cm³/s
Question 2
A researcher is studying the effect of light on the growth of a particular species of plant. The researcher measures the growth rate of the plant at different light intensities and plots the data on a graph. If the graph shows a hyperbolic curve, what can be concluded about the growth of the plant?
A. The plant grows exponentially at first, then slows down as the light intensity increases.
B. The plant grows linearly at first, then slows down as the light intensity increases.
C. The plant grows exponentially throughout its entire growth phase.
D. The plant grows linearly throughout its entire growth phase.
Question 3
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 4
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. 0.64
B. 0.36
C. 0.48
D. 0.16
Question 5
A researcher is studying the effect of temperature on the rate of respiration in a plant. The data collected is shown in the graph below. What is the rate of respiration when the temperature is 25°C?
A. 10.2 μmol CO₂/g/h
B. 12.5 μmol CO₂/g/h
C. 15.8 μmol CO₂/g/h
D. 19.1 μmol CO₂/g/h
Question 6
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'BB'?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 7
In a population of 1000 individuals, 70% are heterozygous for a particular gene, while 30% are homozygous recessive. If a random sample of 50 individuals is taken, what is the probability that the sample will contain at least one homozygous dominant individual?
A. 0.25
B. 0.50
C. 0.75
D. 0.90
Question 8
A 50-year-old woman has a family history of breast cancer. She has a BRCA1 mutation. What is the most likely genetic basis for her increased risk of breast cancer?
A. Environmental factors
B. Genetic mutation
C. Hormonal imbalance
D. Lifestyle choices
Question 9
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate the amount of water in the body
B. To maintain the balance of electrolytes in the body
C. To remove waste products from the body
D. To regulate blood pressure
Question 10
A patient is diagnosed with a disease caused by a virus that replicates in the host cell's cytoplasm. Which of the following is a possible mechanism by which the virus replicates?
A. The virus uses the host cell's DNA replication machinery
B. The virus uses the host cell's RNA replication machinery
C. The virus replicates indep\endently of the host cell
D. The virus is destroyed by the host cell's immune system
Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, calculate the frequency of the homozygous dominant genotype 'AA'.
A. 0.36
B. 0.64
C. 0.16
D. 0.84
Question 12
A researcher studying the eco\logy of a forest e\cosystem discovers that the population of a certain species of tree is limited by the availability of light. Which of the following factors is most likely to be the primary limiting factor for this species?
A. Water
B. Light
C. Temperature
D. Nutrients
Question 13
A bacterium is placed in a medium with a pH of 7.5. The bacterium has a growth rate of 0.5/h when the pH is 7.5. If the pH of the medium is decreased to 6.5, what is the new growth rate of the bacterium?
A. 0.2/h
B. 0.3/h
C. 0.4/h
D. 0.5/h
Question 14
A 100 mL sample of a solution containing 0.1 M NaCl is placed in a centrifuge tube. If the tube is centrifuged at 3000 rpm for 10 minutes, what is the volume of the superna\tant?
A. 50 mL
B. 75 mL
C. 90 mL
D. 100 mL
Question 15
In a population of 1000 bacteria, 80% are susceptible to antibiotic treatment, 15% are resis\tant, and 5% are in a latent state. If 200 bacteria are treated with an antibiotic, what is the expected number of bacteria that will be killed?
A. 80
B. 120
C. 160
D. 200

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