POST UTME SKYLINE UNIVERSITY 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
The process by which water moves through a plant, from the roots to the leaves, is known as?
A. Transpiration
B. Respiration
C. Photosynthesis
D. Osmosis
Question 2
A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?
A. 1/4
B. 1/2
C. 3/4
D. 3/8
Question 3
A plant has a root system with a total surface area of 100 cm². If the root system is divided into two equal parts, what is the surface area of each part?
A. 50
B. 75
C. 100
D. 150
Question 4
In a eukaryotic cell, the \endoplasmic reticulum is involved in the synthesis of proteins that are destined for secretion or for use within the cell. Which of the following statements is true about the \endoplasmic reticulum?
A. The \endoplasmic reticulum is a type of organelle found in prokaryotic cells.
B. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for use within the cell.
C. The \endoplasmic reticulum is a type of organelle found in eukaryotic cells.
D. The \endoplasmic reticulum is involved in the synthesis of proteins that are destined for secretion.
Question 5
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. 1
Question 6
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
A. Reabsorption of ions in the proximal convoluted tubule
B. Secretion of ions in the distal convoluted tubule
C. Regulation of ion channels in the collecting duct
D. Hormonal regulation of ion balance
Question 7
A plant has a root system with a total surface area of 100 cm². If the root system is divided into three equal parts, what is the surface area of each part?
A. 33
B. 50
C. 66
D. 100
Question 8
In the context of human eco\logy, what is the primary function of the hypothalamus in regulating body temperature?
A. To maintain a cons\tant body temperature through sweating and shivering.
B. To regulate body temperature through the release of hormones.
C. To maintain a stable body temperature through the use of insulation.
D. To regulate body temperature through the use of vasodilation and vasoconstriction.
Question 9
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?
A. 1/4
B. 1/2
C. 3/4
D. 3/8
Question 10
In the context of eco\logical succession, what is the term for the initial stage of primary succession, characterized by the presence of pioneer species?
A. Pioneer stage
B. Climax stage
C. Intermediate stage
D. Regressive stage
Question 11
In a desert e\cosystem, what type of organisms are typically found in the topmost layer of the soil?
A. Bacteria
B. Fungi
C. Algae
D. Lichens
Question 12
A diagram of a plant's root system is shown below. What is the name of the structure labeled 'A'?
A. Taproot
B. Fibrous root
C. Adventitious root
D. Lateral root
Question 13
A diagram of the human eye is shown below. What is the primary function of the optic nerve?
A. To transmit visual information from the retina to the brain.
B. To regulate the amount of light entering the eye.
C. To focus light onto the retina.
D. To protect the eye from injury.
Question 14
A researcher is studying the population dynamics of a species of rabbit. The population growth rate is modeled by the \logistic equation \( \frac{dP}{dt} = rP \left\( 1 - \frac{P}{K} \right \). If the carrying capacity K is 1000 and the initial population is 100, what is the population size after 10 years?
A. 500
B. 750
C. 900
D. 950
Question 15
A geneticist is studying the inheri\tance of a particular trait in a population of organisms. The geneticist uses a Punnett square to predict the probability of the trait being expressed in the offspring. Which of the following statements is true about the Punnett square?
A. The Punnett square is used to predict the probability of a trait being expressed in the offspring.
B. The Punnett square is used to predict the probability of a trait being recessive.
C. The Punnett square is used to predict the probability of a trait being dominant.
D. The Punnett square is used to predict the probability of a trait being expressed in the parents.

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