POST UTME WELLSPRING UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The diagram below shows the structure of a plant root. Which of the following is the primary function of the root hair?
A. To absorb water and minerals from the soil
B. To anchor the plant in the soil
C. To produce hormones that regulate plant growth
D. To store food for the plant
Question 2
A 30-year-old woman presents with a 2-year history of amenorrhea. Her physical examination reveals a normal secondary sexual characteristic development. What is the most likely diagnosis?
A. Polycystic ovary syndrome (PCOS)
B. Premature ovarian failure (POF)
C. Hypothalamic amenorrhea
D. Asherman's syndrome
Question 3
The process of natural selection can lead to the evolution of a population in which the average height of individuals increases over time. Which of the following mechanisms is responsible for this change?
A. Genetic drift
B. Gene flow
C. Mutation
D. Selection
Question 4
The process of photosynthesis involves the conversion of light energy into chemical energy. Which of the following reac\tants is converted into glu\cose during photosynthesis?
A. Carbon dioxide
B. Water
C. Glu\cose
D. Oxygen
Question 5
In a process of cellular respiration, the glu\cose molecule (C6H12O6) is converted into carbon dioxide and water. What is the net energy yield from the complete breakdown of one glu\cose molecule?
A. 36 ATP
B. 42 ATP
C. 48 ATP
D. 60 ATP
Question 6
A plant has a 20% chance of producing a red flower and a 30% chance of producing a yellow flower. What is the probability that the plant will produce a red flower or a yellow flower?
A. 0.10
B. 0.20
C. 0.30
D. 0.40
Question 7
A 2.5-metre tall person is s\tanding 15 metres away from a convex lens of focal length 0.5 metres. What is the magnification of the image formed by the lens?
A. -0.5
B. -1.0
C. -1.5
D. -2.0
Question 8
A population of bacteria has a growth rate of 0.05 h^-1. If the initial population size is 10^6 cells, what is the population size after 2 hours?
A. 10^5 cells
B. 10^6 cells
C. 10^7 cells
D. 10^8 cells
Question 9
In a eukaryotic cell, the process of mitosis involves the separation of chromosomes into two daughter cells. Which of the following stages of mitosis is characterized by the condensation of chromosomes?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 10
A researcher studying the effects of light intensity on plant growth uses a growth chamber with a light spectrum of 400-700 nm. Which part of the electromagnetic spectrum does this light fall into?
A. Infrared
B. Visible
C. Ultraviolet
D. X-ray
Question 11
A plant has a photosynthetic rate of 10 μmol CO2 s^-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2 s^-1
B. 40 μmol CO2 s^-1
C. 60 μmol CO2 s^-1
D. 80 μmol CO2 s^-1
Question 12
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?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 13
The diagram below shows the structure of a plant cell. Which part of the cell is responsible for photosynthesis?
A. Vacuole
B. Chloroplast
C. Cell wall
D. Cytoplasm
Question 14
In a population of 1000 individuals, the frequency of the dominant allele (A) is 0.6 and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the homozygous dominant genotype (AA)?
A. 0.36
B. 0.48
C. 0.52
D. 0.64
Question 15
A 25-year-old man presents with a 5-year history of infertility. His semen analysis reveals a low sperm count. What is the most likely cause of his infertility?
A. Varicocele
B. Epididymitis
C. Cryptorchidism
D. Hypogonadism

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