POST UTME UNILAG 2020 Biology | Objective

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Question 1 View Details
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'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

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Question 2 View Details
A diagram of the human eye is shown below.
A. The cornea is the transparent part of the eye.
Correct B. The lens is the part of the eye that changes shape to focus on objects.
C. The retina is the light-sensitive tissue at the back of the eye.
D. The iris is the colored part of the eye.

Correct Answer: B

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Question 3 View Details
In a random sample of 1000 individuals from a population, 250 have the genotype 'Bb'. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the dominant allele 'B'?
A. 0.25
Correct B. 0.3
C. 0.35
D. 0.4

Correct Answer: B

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Question 4 View Details
A diagram of the human skeletal system is shown below.
Correct A. The femur is the longest bone in the human body.
B. The humerus is the bone of the upper arm.
C. The tibia is the bone of the lower leg.
D. The fibula is the bone of the upper leg.

Correct Answer: A

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Question 5 View Details
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 recessive genotype 'aa'?
Correct A. 0.16
B. 0.36
C. 0.64
D. 0.84

Correct Answer: A

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Question 6 View Details
In a tropical rainforest e\cosystem, the primary consumers are typically herbivores that feed on the abundant plant life. However, some primary consumers are carnivorous insects that feed on other insects. Which of the following is an example of a carnivorous insect that is a primary consumer in a tropical rainforest e\cosystem?
A. Aphid
B. Ladybug
Correct C. Praying Mantis
D. Butterfly

Correct Answer: C

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Question 7 View Details
In a desert e\cosystem, the process of osmoregulation is crucial for the survival of organisms. Which of the following is an example of a mechanism used by a desert-dwelling organism to regulate its body fluids?
A. Countercurrent heat exchange in the kidneys
B. Evaporation of water from the skin
Correct C. Concentration of urine
D. Dilation of blood vessels

Correct Answer: C

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Question 8 View Details
In a population of rabbits, the frequency of the gene for brown fur is 0.6, and the frequency of the gene for black fur is 0.4. What is the expected frequency of the heterozygous genotype (Bb) in the population?
A. 0.2
Correct B. 0.4
C. 0.6
D. 0.8

Correct Answer: B

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Question 9 View Details
In a human cell, the process of cellular respiration involves the breakdown of glu\cose to produce ATP. Which of the following is an example of a byproduct of cellular respiration?
Correct A. Carbon dioxide
B. Water
C. ATP
D. Lactic acid

Correct Answer: A

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Question 10 View Details
In a classification system, the domain Eukarya includes organisms with complex cells that have a true nucleus. Which of the following is an example of a characteristic of a eukaryotic cell?
A. Presence of a cell wall
Correct B. Presence of a true nucleus
C. Presence of mitochondria
D. Presence of a flagellum

Correct Answer: B

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Question 11 View Details
In the context of cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial inner membrane
C. To reduce NADH and FADH2 to NAD+ and FAD
D. To produce water and carbon dioxide as byproducts

Correct Answer: B

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Question 12 View Details
A diagram of a plant cell is shown below. Identify the organelle responsible for protein synthesis.
A. Mitochondria
B. Chloroplast
Correct C. Ribosome
D. Lysosome

Correct Answer: C

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Question 13 View Details
A patient with a rare genetic disorder has a mutation in the gene encoding the \alpha-globin subunit of hemoglobin. Which of the following is a likely consequence of this mutation?
A. Increased oxygen delivery to tissues
Correct B. Reduced oxygen delivery to tissues
C. No change in oxygen delivery to tissues
D. Increased carbon dioxide production

Correct Answer: B

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Question 14 View Details
A diagram of the human eye is shown below. Identify the part of the eye responsible for detecting changes in light intensity.
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 15 View Details
A diagram of the human kidney is shown below. Identify the part of the kidney responsible for filtering waste products from the blood.
A. Renal cortex
B. Renal medulla
Correct C. Nephron
D. Collecting duct

Correct Answer: C

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Question 16 View Details
In the context of asexual reproduction, what is the primary advantage of budding in yeast?
A. Increased genetic diversity
Correct B. Reduced energy exp\enditure
C. Improved survival rates in harsh environments
D. Enhanced adaptability to changing environments

Correct Answer: B

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Question 17 View Details
A diagram of the human eye is shown below. Which part of the eye is responsible for detecting light?
A. Cornea
B. Iris
Correct C. Retina
D. Lens

Correct Answer: C

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Question 18 View Details
The xylem tissue in plants is responsible for transporting what subs\tance?
Correct A. Water and minerals
B. Sugars and amino acids
C. Hormones and growth regulators
D. Waste products and excess ions

Correct Answer: A

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Question 19 View Details
In the context of genetics, what is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 20 View Details
A diagram of the human reproductive system is shown below. Which part of the system is responsible for producing sperm?
Correct A. Testes
B. Epididymis
C. Vas deferens
D. Prostate gland

Correct Answer: A

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Question 21 View Details
In the context of blood transport systems, what is the primary function of the erythrocyte membrane?
A. To regulate the amount of oxygen in the blood
Correct B. To maintain the osmotic balance between the blood and tissues
C. To facilitate the transport of carbon dioxide
D. To regulate the pH of the blood

Correct Answer: B

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Question 22 View Details
A plant with a genotype of RrSs is crossed with a plant having the genotype RrSS. What is the probability of the offspring having the phenotype of red flowers?
A. 1/4
Correct B. 1/2
C. 3/4
D. 2/3

Correct Answer: B

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Question 23 View Details
A diagram of the human eye is shown below. Which part of the eye is responsible for adjusting the size of the pupil?
A. The lens
B. The retina
Correct C. The iris
D. The cornea

Correct Answer: C

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Question 24 View Details
A diagram of the human nervous system is shown below. Which part of the nervous system is responsible for controlling voluntary movements?
A. The central nervous system
B. The peripheral nervous system
C. The autonomic nervous system
Correct D. The somatic nervous system

Correct Answer: D

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Question 25 View Details
A diagram of the human reproductive system is shown below. Which part of the reproductive system is responsible for producing sperm?
A. The ovaries
Correct B. The testes
C. The epididymis
D. The vas deferens

Correct Answer: B

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