POST UTME MADONNA UNIVERSITY 2020 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a population of 1000 Drosophila melanogaster, 200 individuals are homozygous dominant for the gene controlling eye color, 300 are heterozygous, and 500 are homozygous recessive. What is the frequency of the dominant allele in this population?
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 2
A diagram shows a cross-section of a root hair cell. Which of the following structures is responsible for the absorption of water?
A. Vacuole
B. Plasmodesmata
C. Tonoplast
D. Cell wall
Question 3
A certain species of plant has a photosynthetic rate of 10 mg CO2/m2/s. If the plant is exposed to light for 8 hours a day, and the light intensity is 500 W/m2, what is the total amount of CO2 fixed by the plant in a day?
A. 150,000 mg CO2
B. 180,000 mg CO2
C. 200,000 mg CO2
D. 250,000 mg CO2
Question 4
A diagram shows a simplified representation of the electron transport chain. Which of the following is the primary function of Complex III?
A. Proton pumping
B. Electron transfer
C. ATP synthesis
D. Electron leakage
Question 5
A researcher is studying the effect of temperature on the growth of yeast. The researcher measures the growth rate of yeast at different temperatures and plots the data on a graph. If the growth rate is highest at 30°C and decreases as the temperature moves away from 30°C, what type of enzyme is most likely responsible for this phenomenon?
A. Thermalase
B. Thermolase
C. Thermophilase
D. Thermosensitive enzyme
Question 6
A diagram of the human nervous system is shown below. What is the name of the part labeled 'B'?
A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord
Question 7
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 1.0 m/s
B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s
Question 8
In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B), while 30% have the recessive allele (b). If two individuals with brown eye color are randomly selected for a study, what is the probability that they will both have brown eye color?
A. 0.49
B. 0.51
C. 0.7
D. 0.9
Question 9
A diagram of a plant's xylem and phloem is shown below. What is the primary function of the xylem?
A. Transporting water and minerals
B. Transporting sugars and amino acids
C. Producing energy through photosynthesis
D. Regulating temperature
Question 10
A diagram of the human eye is shown below. What is the name of the part labeled 'A'?
A. Cornea
B. Iris
C. Retina
D. Lens
Question 11
In the context of respiration and gas exchange, what is the primary function of the alveoli in the lungs?
A. To facilitate the exchange of oxygen and carbon dioxide
B. To regulate the pH of the blood
C. To control the rate of breathing
D. To produce surfac\tant
Question 12
A 0.5 M solution of NaCl is prepared by dissolving 25 g of NaCl in 100 mL of water. What is the concentration of the solution in mol/L?
A. 0.4 M
B. 0.5 M
C. 0.6 M
D. 0.7 M
Question 13
In the context of heredity and variation, what is the primary function of the centromere in a eukaryotic chromosome?
A. To facilitate the separation of sister chromatids during mitosis
B. To regulate the replication of the chromosome
C. To ensure the accurate transmission of genetic information from one generation to the next
D. To control the expression of genes
Question 14
A plant cell is placed in a solution with a high concentration of sucrose. What is the expected outcome?
A. Water uptake and cell expansion
B. Water loss and cell shrinkage
C. No change in cell size
D. Cell lysis
Question 15
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of E. coli at different pH levels and plots the data on a graph. If the growth rate is highest at pH 7 and decreases as the pH moves away from 7, what type of enzyme is most likely responsible for this phenomenon?
A. Acid phosphatase
B. Alkaline phosphatase
C. Lactase
D. Amylase

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