POST UTME NOUN 2021 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what is the population size after 5 hours?
A. 1000
B. 500
C. 2000
D. 2500
Question 2
A diagram of a plant cell is shown below. What is the function of the structure labeled 'X'?
A. Site of protein synthesis
B. Site of lipid synthesis
C. Site of carbohydrate synthesis
D. Site of nucleic acid synthesis
Question 3
A diagram of a plant cell is shown below. Identify the part labeled 'A'?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole
Question 4
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 blood glu\cose levels
C. Stress response and adaptation
D. Regulation of appetite and satiety
Question 5
In the context of eco\logy, what is the term for the movement of organisms from one habitat to another?
A. Migration
B. Hibernation
C. Camouflage
D. Adaptation
Question 6
A species of bird has a beak shape that is adapted for cracking open nuts. However, the beak shape also makes it difficult for the bird to eat seeds. What is an example of a trade-off in this scenario?
A. The bird's ability to crack open nuts is reduced, but its ability to eat seeds is increased
B. The bird's ability to crack open nuts is increased, but its ability to eat seeds is reduced
C. The bird's ability to crack open nuts is not affected, but its ability to eat seeds is increased
D. The bird's ability to crack open nuts is not affected, but its ability to eat seeds is reduced
Question 7
In a cell undergoing mitosis, what is the stage at which the chromosomes are most condensed and visible under a microscope?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
Question 8
A population of bacteria is growing in a culture medium. If the growth rate is 0.5 per hour, and the initial population is 1000 cells, what will be the population after 3 hours?
A. 3000
B. 5000
C. 10000
D. 20000
Question 9
In a eukaryotic cell, the process of cellular respiration involves the breakdown of glu\cose to produce ATP. Which of the following is the primary function of the electron transport chain in this process?
A. To generate a proton gradient across the mitochondrial membrane
B. To produce NADH and FADH2
C. To generate ATP through chemiosmosis
D. To produce water and carbon dioxide
Question 10
A DNA molecule consists of two complementary strands of nucleotides. If the sequence of one strand is ATCG, what is the sequence of the complementary strand?
A. TAGC
B. TCGA
C. TGCA
D. TGAC
Question 11
In a human body, the process of excretion involves the removal of waste products from the blood. Which of the following organs is primarily responsible for excretion?
A. Liver
B. Kidneys
C. Lungs
D. Skin
Question 12
A plant is placed in a greenhouse with a temperature of 25°C and a relative humidity of 60%. If the plant requires a temperature of 20°C and a relative humidity of 80% to grow optimally, what will happen to the plant?
A. The plant will grow optimally.
B. The plant will grow slowly.
C. The plant will not grow at all.
D. The plant will die.
Question 13
In a population of 1000 individuals, 20% are homozygous dominant for the gene controlling flower color, 40% are heterozygous, and the remaining 40% are homozygous recessive. If the population is randomly mated, what is the probability that a randomly selected individual will be homozygous dominant for the gene controlling flower color?
A. 0.2
B. 0.4
C. 0.6
D. 0.8
Question 14
In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?
A. To regulate pH levels in the blood
B. To maintain the balance of electrolytes such as sodium and potassium
C. To remove excess water from the body
D. To regulate blood pressure
Question 15
A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a characteristic of xylem tissue?
A. It is composed of dead cells
B. It is responsible for transporting sugars and amino acids
C. It is composed of tracheids and vessel elements
D. It is responsible for transporting water and minerals

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