POST UTME ESUT 2018 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of eco\logy, what is the primary function of a keystone species?
A. To regulate the population of other species
B. To maintain the structure of the e\cosystem
C. To provide a source of food for other species
D. To influence the physical environment
Question 2
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. 0.52
Question 3
A plant cell is placed in a solution with a high concentration of salt. What will happen to the cell?
A. The cell will swell and eventually burst
B. The cell will shrink and lose its turgor pressure
C. The cell will remain unchanged
D. The cell will undergo mitosis
Question 4
A diagram of a cell's structure is shown below. What is the function of the organelle labeled 'B'?
A. producing energy for the cell
B. regulating cell growth and division
C. storing genetic information
D. transporting subs\tances into and out of the cell
Question 5
A certain species of animal has a population growth rate of 20% per year. If the population is 1000 individuals initially, what will be the population after 5 years?
A. 1638
B. 1862
C. 2000
D. 2200
Question 6
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. 0.72
D. 0.80
Question 7
A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell is in a culture medium with a glu\cose concentration of 1 g/L, what is the rate of glu\cose uptake by the cell?
A. 0.125 g/L
B. 0.250 g/L
C. 0.500 g/L
D. 1.000 g/L
Question 8
The theory of evolution by natural selection was first proposed by
A. Charles Darwin
B. Gregor M\endel
C. Jean-Baptiste Lamarck
D. Alfred Russel Wallace
Question 9
The diagram below shows the structure of a typical plant cell. Identify the organelle responsible for protein synthesis.
A. Mitochondria
B. Chloroplast
C. Ribosome
D. Lysosome
Question 10
A plant has a photosynthetic rate of 10 mg CO2/h. If the concentration of CO2 in the air is 400 ppm, what is the rate of photosynthesis?
A. 20 ppm
B. 40 ppm
C. 60 ppm
D. 80 ppm
Question 11
A genetic trait is determined 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 for the trait?
A. RR
B. Rr
C. rr
D. RrRr
Question 12
A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the stage of the cell cycle that the cell will enter next?
A. G1
B. S
C. G2
D. M
Question 13
A plant is placed in a greenhouse with a controlled environment. The temperature is maintained at 25°C and the humidity is maintained at 60%. What is the primary function of the stomata in this plant?
A. To regulate water loss through transpiration
B. To regulate gas exchange
C. To regulate temperature
D. To regulate humidity
Question 14
In a eukaryotic cell, the process of photosynthesis occurs in the
A. Mitochondria
B. Chloroplast
C. Nucleus
D. Endoplasmic Reticulum
Question 15
In a food chain, what is the role of a decomposer?
A. To produce energy for the e\cosystem
B. To break down dead organic matter
C. To regulate the population of other species
D. To maintain the structure of the e\cosystem

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