POST UTME ACHIEVERS UNIVERSITY 2022 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In the context of hormonal regulation, what is the primary function of the hypothalamus?
A. To produce hormones that stimulate appetite
B. To regulate body temperature
C. To control the release of hormones from the pituitary gland
D. To synthesize proteins
Question 2
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. What is the expected frequency of the homozygous recessive genotype 'aa'?
A. 0.04
B. 0.08
C. 0.12
D. 0.16
Question 3
The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?
A. Random mating
B. Large population size
C. No mutation
D. No genetic drift
Question 4
In the context of excretion, what is the primary function of the kidneys?
A. To regulate blood pressure
B. To filter waste products from the blood
C. To produce hormones that stimulate digestion
D. To control body temperature
Question 5
In the context of photosynthesis, which of the following pigments is responsible for absorbing light energy in the blue-violet region of the visible spectrum?
A. Chlorophyll a
B. Chlorophyll b
C. Carotenoids
D. Phycobiliproteins
Question 6
A 50 mL sample of a 0.1 M solution of NaCl is added to a 100 mL sample of a 0.2 M solution of NaOH. What is the concentration of the resulting solution?
A. 0.05 M
B. 0.1 M
C. 0.15 M
D. 0.2 M
Question 7
A researcher is studying the effects of climate change on coral reefs. Which of the following biomes is most likely to be affected by ri\sing sea temperatures?
A. Tropical rainforest
B. Temperate deciduous forest
C. Coral reef
D. Grassland
Question 8
A plant cell has a high concentration of starch grains in its chloroplasts. What is the likely effect on the plant's rate of photosynthesis?
A. Increased rate of photosynthesis
B. Decreased rate of photosynthesis
C. No effect on the rate of photosynthesis
D. Variable rate of photosynthesis
Question 9
A plant cell is placed in a solution with a high concentration of sucrose. What happens to the cell's turgor pressure?
A. Increases
B. Decreases
C. Remains the same
D. No change
Question 10
A 25-year-old patient presents with symptoms of fatigue, weakness, and shortness of breath. Laboratory tests reveal a hemoglobin level of 8 g/dL. Which of the following is the most likely diagnosis?
A. Iron deficiency anemia
B. Vitamin B12 deficiency anemia
C. Folate deficiency anemia
D. Sickle cell anemia
Question 11
A nerve impulse travels from the d\endrite to the axon terminal of a neuron. What is the primary function of the synapse in this process?
A. To transmit the nerve impulse
B. To regulate the strength of the nerve impulse
C. To facilitate the release of neurotransmitters
D. To terminate the nerve impulse
Question 12
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is selectively permeable, what is the concentration of sucrose in the cytosol?
A. 0.4 M
B. 0.5 M
C. 0.6 M
D. 0.7 M
Question 13
A 50-g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. The resulting solution has a conductivity of 0.05 S/m. What is the concentration of the mixture?
A. 0.1 M
B. 0.2 M
C. 0.3 M
D. 0.4 M
Question 14
A patient is experiencing symptoms of dizziness, nausea, and vomiting after a meal. Which of the following nerves is most likely responsible for these symptoms?
A. Vagus nerve
B. Trigeminal nerve
C. Glossopharyngeal nerve
D. Vestibulocochlear nerve
Question 15
In the context of blood transport systems, which of the following is a characteristic of the erythrocyte membrane?
A. High permeability to water
B. Low permeability to water
C. High permeability to ions
D. Low permeability to ions

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