POST UTME GREENFIELD UNIVERSITY 2017 Biology | Objective

Are you preparing for POST UTME GREENFIELD UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Biology (Objective) questions designed to simulate the real exam environment.

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Question 1
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if five certain conditions are met. Which of the following is NOT one of these conditions?
Correct A. Large population size
B. Random mating
C. No mutation
D. No genetic drift

Correct Answer: A

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Question 2
In a plant cell, the process of photosynthesis occurs in the chloroplasts. What is the primary function of the thylakoid membranes in the chloroplasts?
Correct A. To produce ATP
B. To produce NADPH
C. To produce glu\cose
D. To produce oxygen

Correct Answer: A

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Question 3
The xylem is a type of vascular tissue in plants that is responsible for transporting water and minerals from the roots to the leaves. What is the primary function of the xylem parenchyma cells?
A. To produce xylem sap
Correct B. To transport water and minerals
C. To store starch
D. To produce xylem fibers

Correct Answer: B

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Question 4
The process of mitosis is a type of cell division that results in two daughter cells that are genetically identical to the parent cell. What is the primary function of the spindle fibers during mitosis?
Correct A. To separate the chromosomes
B. To attach the chromosomes to the spindle poles
C. To produce the daughter cells
D. To produce the spindle apparatus

Correct Answer: A

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Question 5
The process of photosynthesis occurs in the chloroplasts of plant cells. What is the primary function of the light-dep\endent reactions?
Correct A. To produce ATP and NADPH
B. To produce glu\cose and oxygen
C. To produce starch and cellulose
D. To produce amino acids and lipids

Correct Answer: A

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Question 6
In the context of evolutionary theory, what is the primary mechanism driving the adaptation of populations to changing environments?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 7
A plant has a xylem sap concentration of 0.5 M. If the plant is subjected to a temperature increase of 10°C, what is the expected change in xylem sap concentration?
A. 0.5 M
Correct B. 0.6 M
C. 0.4 M
D. 0.3 M

Correct Answer: B

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Question 8
Asexual reproduction in plants can occur through which of the following methods?
A. Budding
B. Fragmentation
C. Spore formation
Correct D. All of the above

Correct Answer: D

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Question 9
A population of 100 individuals has a mean height of 160 cm. If the population is divided into two equal groups, one with a mean height of 165 cm and the other with a mean height of 155 cm, what is the expected frequency distribution of the two groups?
A. Normal distribution
B. Skewed distribution
Correct C. Bimodal distribution
D. Uniform distribution

Correct Answer: C

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Question 10
A genetic cross between two individuals with the genotype AaBb results in offspring with the following phenotypes: 25% AA BB, 50% AaBb, 25% aaBB. What is the probability of an offspring inheriting the dominant allele for the A locus?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 11
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?
Correct A. 0.16
B. 0.24
C. 0.32
D. 0.4

Correct Answer: A

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Question 12
A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell undergoes mitosis, what will be the DNA content of the daughter cells?
Correct A. 4C
B. 8C
C. 16C
D. 32C

Correct Answer: A

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Question 13
A species of bird has a beak shape that is adapted for cracking open nuts. If the bird's beak shape is determined by a \single gene with two alleles, one of which is dominant and the other recessive, what is the genotype of a bird with a beak shape that is intermediate between the two extremes?
A. Bb
B. BB
C. bb
Correct D. Bb or bb

Correct Answer: D

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Question 14
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.05 per hour, what will be the population size after 5 hours?
A. 1000
Correct B. 5000
C. 10000
D. 20000

Correct Answer: B

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Question 15
A species of plant has a flower color that is determined by a \single gene with two alleles, one of which is dominant and the other recessive. If a plant with the genotype 'Rr' is crossed with a plant with the genotype 'rr', what is the probability that the offspring will have the genotype 'RR'?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1

Correct Answer: A

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Question 16
In a desert e\cosystem, the primary consumers are primarily fed by which of the following producers?
Correct A. C3 plants
B. C4 plants
C. CAM plants
D. Crassulacean acid metabolism plants

Correct Answer: A

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Question 17
The process by which microorganisms break down dead organic matter is known as?
Correct A. Decomposition
B. Fermentation
C. Respiration
D. Photosynthesis

Correct Answer: A

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Question 18
The classification of living organisms into kingdoms is based on?
A. Cell structure
B. Metabolism
C. Cell wall composition
Correct D. Genetic material

Correct Answer: D

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Question 19
The process by which a cell divides into two daughter cells is known as?
Correct A. Mitosis
B. Meiosis
C. Binary fission
D. Endospore formation

Correct Answer: A

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Question 20
The diagram below shows the structure of a cell. Which of the following organelles is responsible for protein synthesis?
A. Nucleus
B. Mitochondria
Correct C. Ribosomes
D. Endoplasmic reticulum

Correct Answer: C

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Question 21
In a photosynthetic process, what is the primary function of the thylakoid membrane?
Correct A. To absorb light energy
B. To release oxygen gas
C. To synthesize glu\cose
D. To store energy in ATP

Correct Answer: A

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Question 22
A plant's growth rate is influenced by the concentration of auxins in its cells. What is the primary effect of auxins on plant growth?
A. Inhibits cell elongation
Correct B. Promotes cell division
C. Increases cell wall thickness
D. Enhances root growth

Correct Answer: B

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Question 23
A diagram of a xylem vessel is shown below. What is the primary function of the xylem vessel in the transport of water and minerals?
Correct A. To transport water and minerals from roots to leaves
B. To transport sugars and amino acids from leaves to roots
C. To store water and minerals in the stem
D. To release oxygen gas into the atmosphere

Correct Answer: A

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Question 24
A diagram of a human heart is shown below. What is the primary function of the atrioventricular (AV) node in the cardiac cycle?
Correct A. To regulate the heart rate
B. To pump blood from the atria to the ventricles
C. To release oxygenated blood into the aorta
D. To store blood in the ventricles

Correct Answer: A

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Question 25
A diagram of a human reproductive system is shown below. What is the primary function of the epididymis in the male reproductive system?
A. To store sperm cells
Correct B. To transport sperm cells from the testes to the vas deferens
C. To release sperm cells into the ejaculatory duct
D. To produce testosterone hormones

Correct Answer: B

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