POST UTME BSU 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of Drosophila melanogaster is being studied for its evolutionary adaptation to a changing environment. Which of the following is a likely outcome of natural selection in this population?
A. The population will become more genetically diverse
B. The population will adapt to the changing environment
C. The population will become less fit
D. The population will go extinct
Question 2
A person is experiencing respiratory distress due to a blockage in the airway. What is the primary function of the diaphragm in this situation?
A. To increase the volume of the thoracic cavity
B. To decrease the volume of the thoracic cavity
C. To maintain the pressure in the lungs
D. To remove mucus from the airway
Question 3
What is the process by which plants convert light energy into chemical energy?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Osmosis
Question 4
A plant has a root system that absorbs water and nutrients from the soil. The root system is made up of a network of xylem and phloem tissues. What is the primary function of the xylem tissue in the root system?
A. absorbing water and nutrients
B. transporting sugars and other organic compounds
C. supporting the plant's structure
D. regulating the plant's growth
Question 5
In a closed system, what is the net effect of the reaction 2CO2 + 2H2O → C6H12O6 + 6O2 on the concentration of oxygen?
A. The concentration of oxygen increases.
B. The concentration of oxygen decreases.
C. The concentration of oxygen remains the same.
D. The concentration of oxygen is not affected.
Question 6
What is the primary function of the Golgi apparatus in a plant cell?
A. Protein synthesis
B. Cell signaling
C. Lipid synthesis
D. Protein modification and transport
Question 7
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. Production of bile
B. Production of digestive enzymes
C. Absorption of nutrients
D. Storage of waste
Question 8
In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the concentration of oxygen in the atmosphere. If the concentration of oxygen decreases by 20% and the rate of respiration decreases by 15%, what is the ratio of the initial rate of respiration to the final rate of respiration?
A. 1.25
B. 1.5
C. 1.75
D. 2.0
Question 9
The nervous system is responsible for transmitting signals throughout the body. What is the primary function of the synapse in the nervous system?
A. transmitting signals from one neuron to another
B. regulating the strength of the signal
C. supporting the structure of the neuron
D. controlling the release of neurotransmitters
Question 10
A diagram of the human respiratory system is shown below. What is the primary function of the alveoli?
A. To exchange oxygen and carbon dioxide
B. To filter the air
C. To produce mucus
D. To regulate body temperature
Question 11
A person is experiencing respiratory distress due to a severe asthma attack. Which of the following is a likely consequence of the increased airway resis\tance?
A. Increased oxygen levels in the blood
B. Decreased lung volume
C. Increased airway pressure
D. Decreased respiratory rate
Question 12
In the context of microorganisms and diseases, what is the primary function of the immune system?
A. To produce antibodies
B. To produce hormones
C. To regulate body temperature
D. To store food
Question 13
A population of rabbits is introduced to a new habitat with an abundance of food and water. The population grows exponentially, with an initial population of 10 rabbits and a growth rate of 20% per month. After 6 months, the population has grown to 324 rabbits. What is the carrying capacity of the habitat?
A. 1000
B. 2000
C. 3000
D. 4000
Question 14
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following is a characteristic of the primary consumers in this e\cosystem?
A. They have a high metabolic rate to digest cellulose in plant cell walls.
B. They have a low metabolic rate to conserve energy for long-dis\tance migration.
C. They have a specialized digestive system to break down cellulose in plant cell walls.
D. They have a large body size to store energy for long periods.
Question 15
A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?
A. 1/4
B. 1/2
C. 3/4
D. 1

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