POST UTME SKYLINE UNIVERSITY 2023 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A diagram of a e\cosystem is shown below. Identify the biotic factor that is responsible for the decomposition of organic matter.
A. plant
B. animal
C. decomposer
D. microbe
Question 2
A person is diagnosed with a hormonal imbalance. Which of the following best describes the role of the pituitary gland in this condition?
A. To regulate hormone secretion
B. To regulate body temperature
C. To regulate hunger and thirst
D. To regulate sleep and wakefulness
Question 3
In a human nervous system, what is the primary function of the myelin sheath surrounding the axon of a neuron?
A. To transmit electrical signals along the axon
B. To provide structural support to the neuron
C. To regulate the release of neurotransmitters
D. To facilitate the repair of damaged neurons
Question 4
A researcher is studying the effect of temperature on the growth of a microorganism. She places a culture of the microorganism in a controlled environment and measures its growth rate at different temperatures. The data is shown in the table below. What is the temperature at which the growth rate is maximum?
A. 20°C
B. 25°C
C. 30°C
D. 35°C
Question 5
A plant is placed in a greenhouse with a controlled temperature and humidity. Which of the following best describes the process of photosynthesis in this environment?
A. Light-dep\endent reactions
B. Light-indep\endent reactions
C. Calvin cycle
D. Electron transport chain
Question 6
A population of a certain species of bird has a mean clutch size of 4 eggs. If the population is in a stable environment, what is the expected frequency of clutches with 5 eggs?
A. 0.08
B. 0.16
C. 0.24
D. 0.32
Question 7
The human eye's retina contains specialized cells called rods and cones. What is the primary function of these cells?
A. To produce tears
B. To detect light and color
C. To regulate pupil size
D. To focus images
Question 8
In a population of 1000 individuals, 20% are homozygous dominant (BB), 40% are heterozygous (Bb), and 40% are homozygous recessive (bb). What is the frequency of the recessive allele (b) in this population?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 9
In the context of sense organs, what is the primary function of the retina?
A. To detect light and color
B. To detect sound and vibrations
C. To detect touch and pressure
D. To detect taste and smell
Question 10
A species of plant has a photosynthetic rate of 10 μmol CO2 s-1. If the concentration of CO2 in the atmosphere is 400 ppm, what is the rate of photosynthesis?
A. 4 μmol CO2 s-1
B. 8 μmol CO2 s-1
C. 12 μmol CO2 s-1
D. 16 μmol CO2 s-1
Question 11
The xylem is a type of vascular tissue found in plants that is responsible for the transport of water and minerals from the roots to the leaves. What is the primary function of the xylem in plants?
A. To transport sugars and other organic compounds produced by photosynthesis.
B. To regulate the rate of water loss through transpiration.
C. To transport water and minerals from the roots to the leaves.
D. To store water and nutrients in the plant.
Question 12
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. No mutation
C. No gene flow
D. No natural selection
Question 13
The process of binary fission in bacteria involves the replication of the bacterial genome and the subsequent division of the cell into two daughter cells. What is the primary advantage of binary fission in bacteria?
A. It allows for rapid reproduction and colonization of new environments.
B. It enables the bacteria to adapt to changing environmental conditions.
C. It facilitates the exchange of genetic material between bacteria.
D. It increases the complexity of the bacterial cell structure.
Question 14
In a tropical rainforest e\cosystem, what is the primary role of the decomposer population in the nutrient cycle?
A. To break down organic matter into simpler compounds
B. To synthesize complex organic compounds from inorganic nutrients
C. To regulate the population dynamics of other organisms
D. To produce antibiotics that inhibit the growth of other microorganisms
Question 15
A plant has a mutation in the gene that codes for the enzyme RuBisCO. This enzyme is responsible for the fixation of CO2 in the Calvin cycle. If the plant has a 50% reduction in RuBisCO activity, what is the effect on the plant's photosynthetic rate?
A. 25% reduction
B. 50% reduction
C. 75% reduction
D. 100% reduction

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