POST UTME REDEEMERS UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
Which of the following statements best describes the role of the hypothalamus in osmoregulation?
A. It regulates the release of hormones that stimulate thirst and hunger
B. It monitors the concentration of electrolytes and water in the blood
C. It controls the rate of urine production in response to changes in blood osmolality
D. It is responsible for the sensation of thirst
Question 2
The xylem tissue in plants is responsible for
A. Transport of water and minerals from roots to leaves
B. Transport of sugars and amino acids from leaves to roots
C. Storage of starch and proteins
D. Support and structure of the plant
Question 3
In a typical plant cell, what is the primary function of the vacuole?
A. To store water and nutrients
B. To regulate the concentration of ions in the cytosol
C. To synthesize proteins and other biomolecules
D. To maintain the cell's turgor pressure
Question 4
In the context of plant transport systems, what is the primary function of the xylem?
A. To transport water and minerals from the roots to the leaves
B. To transport sugars and amino acids from the leaves to the roots
C. To regulate stomatal opening and clo\sing
D. To produce auxins for cell elongation
Question 5
A researcher is studying the structure of a protein u\sing X-ray crystal\lography. The protein has a molecular weight of 50 kDa and is composed of 300 amino acids. What is the approximate molecular weight of a \single amino acid in the protein?
A. 150 Da
B. 170 Da
C. 190 Da
D. 210 Da
Question 6
In a typical human cell, what is the primary function of the mitochondria?
A. To synthesize proteins and other biomolecules
B. To regulate the concentration of ions in the cytosol
C. To produce ATP through cellular respiration
D. To store genetic information in the form of DNA
Question 7
In the context of evolutionary theories, what is the primary mechanism by which genetic drift occurs?
A. Mutation
B. Gene flow
C. Genetic drift
D. Natural selection
Question 8
Asexual reproduction in plants can occur through the process of
A. Budding
B. Fragmentation
C. Runners
D. Rhizome
Question 9
A diagram of the human eye is shown below. What is the function of the structure labeled 'A'?
A. To focus light onto the retina
B. To detect light intensity
C. To regulate pupil size
D. To produce tears
Question 10
A diagram of the human eye is shown below. What is the primary function of the lens?
A. To focus light on the retina
B. To detect light intensity
C. To produce tears for lubrication
D. To regulate pupil size
Question 11
A diagram of the human kidney is shown below. Identify the structure labeled 'A'?
A. Renal cortex
B. Renal medulla
C. Renal pelvis
D. Ureter
Question 12
A diagram of the human brain is shown below. Identify the structure labeled 'A'?
A. Cerebrum
B. Cerebellum
C. Brainstem
D. Spinal cord
Question 13
In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?
A. Regulation of body temperature
B. Maintenance of fluid balance
C. Response to stress and anxiety
D. Regulation of appetite and satiety
Question 14
In the context of evolutionary theories and adaptations, what is the primary mechanism by which natural selection occurs?
A. Genetic drift
B. Gene flow
C. Mutation
D. Natural selection
Question 15
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Photosynthesis
B. Cell signaling
C. Protein synthesis
D. Storage of nutrients

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