POST UTME UNIPORT 2020 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 hypothalamus?
A. Regulation of body temperature
B. Stimulation of appetite
C. Regulation of hormone secretion
D. Inhibition of stress response
Question 2
A diagram of a plant's transport system is shown below. Which of the following is the function of the xylem?
A. Transport of water and minerals from the roots to the leaves
B. Transport of sugars and other organic compounds from the leaves to the rest of the plant
C. Both A and B
D. Neither A nor B
Question 3
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'TT'. What is the probability that the offspring will have the genotype 'tt'?
A. 0.25
B. 0.5
C. 0.75
D. 0.9
Question 4
In the context of classification of living things, which of the following is an example of a characteristic that is used to distinguish between prokaryotic and eukaryotic cells?
A. Presence of a true nucleus
B. Presence of mitochondria
C. Presence of a cell wall
D. Presence of ribosomes
Question 5
A diagram of the human eye is shown below. Which of the following is the function of the retina?
A. B\ending of light as it enters the eye
B. Detection of light by the photoreceptors
C. Both A and B
D. Neither A nor B
Question 6
A 50 mL sample of a solution containing 0.1 M glu\cose is titrated with 0.1 M HCl. What is the pH of the solution after 25 mL of HCl has been added?
A. 1
B. 2
C. 3
D. 4
Question 7
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype 'AA'?
A. 0.36
B. 0.64
C. 0.48
D. 0.16
Question 8
A patient is experiencing symptoms of a neuro\logical disorder. Which of the following types of cells is most likely responsible for the development of this disorder?
A. Neurons
B. Astrocytes
C. Microglia
D. Oligod\endrocytes
Question 9
A researcher is studying the structure of a protein u\sing X-ray crystal\lography. Which of the following types of radiation is used to produce the X-ray crystal\lography images?
A. Gamma radiation
B. X-ray radiation
C. Ultraviolet radiation
D. Infrared radiation
Question 10
A 2.5 L container holds 2.0 L of a 0.1 M solution of NaCl. What is the concentration of the solution after adding 0.5 L of water?
A. 0.05 M
B. 0.075 M
C. 0.10 M
D. 0.125 M
Question 11
A diagram of the xylem and phloem tissues in a plant stem is shown below.
A. The xylem tissue is responsible for transporting water and minerals from the roots to the leaves.
B. The phloem tissue is responsible for transporting sugars and other organic compounds from the leaves to the rest of the plant.
C. The xylem tissue is responsible for transporting sugars and other organic compounds from the leaves to the rest of the plant.
D. The phloem tissue is responsible for transporting water and minerals from the roots to the leaves.
Question 12
A plant cell is placed in a solution containing 0.1 M glu\cose. If the cell membrane is permeable to glu\cose, what will be the net movement of glu\cose molecules into the cell?
A. From the solution into the cell
B. From the cell into the solution
C. No net movement
D. Dep\ends on the concentration gradient
Question 13
A 5% solution of glu\cose in water has a concentration of 0.05 g/mL. What is the mass of glu\cose in 250 mL of this solution?
A. 1.25 g
B. 1.50 g
C. 1.75 g
D. 2.00 g
Question 14
In the context of evolutionary theory, what is the primary mechanism by which genetic drift leads to the loss of genetic variation in a population?
A. Genetic recombination
B. Mutation
C. Gene flow
D. Genetic drift
Question 15
The process of osmoregulation in animals involves the regulation of what type of balance?
A. Water balance
B. Electrolyte balance
C. pH balance
D. Oxygen balance

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