POST UTME OAU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of hormonal coordination, what is the primary function of the hormone insulin?
A. To regulate blood glu\cose levels.
B. To stimulate the breakdown of glycogen.
C. To increase the rate of respiration.
D. To decrease the rate of digestion.
Question 2
In a population of a certain species of bird, the frequency of the allele for the trait of having blue feathers is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
A. 0.04
B. 0.16
C. 0.36
D. 0.64
Question 3
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'B'?
A. To pump blood to the lungs.
B. To pump blood to the rest of the body.
C. To regulate blood pressure.
D. To filter waste products.
Question 4
A study on the eco\logy of a freshwater lake revealed that the population of zooplankton increased by 20% in the summer months. However, the population of phytoplankton decreased by 15% during the same period. What is the net effect on the lake's e\cosystem?
A. The lake's e\cosystem is in a state of balance.
B. The lake's e\cosystem is in a state of imbalance.
C. The lake's e\cosystem is in a state of equilibrium.
D. The lake's e\cosystem is in a state of homeostasis.
Question 5
A bio\logist is studying the reproduction of a species of fish. The fish reproduces sexually, with a sex ratio of 1:1. 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 6
A certain species of animal has a digestive system that consists of a mouth, esophagus, stomach, small intestine, and large intestine. Which part of the digestive system is responsible for the breakdown of proteins?
A. Mouth
B. Esophagus
C. Stomach
D. Small intestine
Question 7
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 8
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 9
A patient is diagnosed with a bacterial infection. Which of the following antibiotics is most likely to be effective against the infection?
A. Penicillin
B. Erythromycin
C. Tetracycline
D. Ciprofloxacin
Question 10
The process by which water moves through a plant, from the roots to the leaves, is known as
A. Transpiration
B. Translocation
C. Respiration
D. Photosynthesis
Question 11
The process by which plants absorb nutrients from the soil is known as
A. Transpiration
B. Respiration
C. Photosynthesis
D. Osmosis
Question 12
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 13
A patient with a severe case of diabetes is being treated with insulin. Which of the following is a common side effect of insulin therapy?
A. Hypoglycemia
B. Hyperglycemia
C. Weight gain
D. Fatigue and weakness
Question 14
The type of tissue that makes up the outer layer of the stem is known as
A. Dermal tissue
B. Vascular tissue
C. Ground tissue
D. Epidermal tissue
Question 15
A patient with a severe case of tuberculosis is being treated with a combination of antibiotics. Which of the following is a common side effect of one of the antibiotics used in the treatment?
A. Nausea and vomiting
B. Diarrhea and abdominal pain
C. Rash and itching
D. Hearing loss and tinnitus

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