POST UTME OAU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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. 0.64
D. 0.72
Question 2
A patient has a blood pressure of 120/80 mmHg. If the patient's heart rate is 70 beats per minute, what is the cardiac output?
A. 8400 mL min-1
B. 840 mL min-1
C. 84 mL min-1
D. 8.4 mL min-1
Question 3
A certain species of plant has a photosynthetic rate of 10 g CO2/m^2/h. If the plant is exposed to a light intensity of 500 W/m^2, what is the rate of photosynthesis?
A. 5 g CO2/m^2/h
B. 10 g CO2/m^2/h
C. 15 g CO2/m^2/h
D. 20 g CO2/m^2/h
Question 4
The diagram below shows the structure of a human eye. Which part of the eye is responsible for adjusting the size of the pupil?
A. Cornea
B. Iris
C. Lens
D. Retina
Question 5
A certain species of plant has a root system that consists of a taproot and a network of smaller roots. Which part of the root system is responsible for the absorption of water and nutrients?
A. Taproot
B. Smaller roots
C. Both
D. Neither
Question 6
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
A. To focus light on the retina.
B. To re\fract light entering the eye.
C. To absorb excess light.
D. To produce tears.
Question 7
The type of tissue that makes up the inner layer of the stem is known as
A. Dermal tissue
B. Vascular tissue
C. Ground tissue
D. Epidermal tissue
Question 8
The diagram below shows a simple circuit. If the battery is 9V and the resis\tance of the circuit is 10 ohms, what is the current flowing through the circuit?
A. 0.9 A
B. 1.8 A
C. 2.7 A
D. 3.6 A
Question 9
A geneticist is studying the inheri\tance of a particular trait in a population of rabbits. The trait is controlled by a \single gene with two alleles: A and a. The geneticist finds that the frequency of the A allele is 0.6, and the frequency of the a allele is 0.4. What is the expected genotype and phenotype of the offspring of two heterozygous parents?
A. Genotype: Aa, Phenotype: A
B. Genotype: Aa, Phenotype: a
C. Genotype: AA, Phenotype: A
D. Genotype: aa, Phenotype: a
Question 10
A microbio\logist is studying the growth of a bacterial culture. The culture is grown in a medium with a pH of 8. The bacterial growth rate is 0.7/h. What is the expected pH of the culture after 3 hours?
A. 7.5
B. 8.5
C. 9.5
D. 10.5
Question 11
The process by which plants absorb water and minerals from the soil is known as
A. Transpiration
B. Respiration
C. Photosynthesis
D. Osmosis
Question 12
A population of bacteria is growing exponentially. If the initial population is 100 and the population doubles every 2 hours, what is the population after 6 hours?
A. 1600
B. 3200
C. 6400
D. 12800
Question 13
The process by which plants convert light energy into chemical energy is known as
A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation
Question 14
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. Cell wall
B. Chloroplast
C. Mitochondria
D. Nucleus
Question 15
A researcher is studying the effect of antibiotics on the growth of bacteria. The researcher measures the growth rate of the bacteria at different concentrations of antibiotics and plots the data on a graph. Which of the following best describes the relationship between antibiotic concentration and growth rate?
A. Directly proportional
B. Inversely proportional
C. No relationship
D. U-shaped

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