POST UTME CRAWFORD UNIVERSITY 2022 Biology | Objective

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Question 1
A population of Drosophila melanogaster is being studied for its genetic variation. The frequency of the recessive allele 'a' is 0.2. What is the expected frequency of the homozygous recessive genotype 'aa' in the population?
Correct A. 0.04
B. 0.08
C. 0.16
D. 0.32

Correct Answer: A

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Question 2
A diagram of the xylem tissue in a plant stem is shown below.
Correct A. Tracheids are dead cells that provide structural support to the plant.
B. Xylem parenchyma cells are responsible for the transport of water and minerals.
C. Tracheids are involved in the transport of sugars and other organic compounds.
D. Xylem parenchyma cells are dead cells that provide structural support to the plant.

Correct Answer: A

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Question 3
A scientist is studying the evolution of a population of birds. The population is currently in a state of genetic equilibrium. What is the expected change in the frequency of the dominant allele 'B' if the population size is reduced by 50%?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1.0

Correct Answer: A

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Question 4
A diagram of the human circulatory system is shown below.
Correct A. The heart is a muscular organ that pumps blood throughout the body.
B. Arteries are blood vessels that carry oxygenated blood from the heart to the rest of the body.
C. The heart is a hollow organ that stores blood.
D. Arteries are blood vessels that carry deoxygenated blood from the body to the heart.

Correct Answer: A

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Question 5
A scientist is studying the effect of a new antibiotic on a population of bacteria. The population is currently in a state of genetic equilibrium. What is the expected change in the frequency of the resis\tant allele 'R' if the population is exposed to the antibiotic?
Correct A. 0.25
B. 0.5
C. 0.75
D. 1.0

Correct Answer: A

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Question 6
In a population of E. coli, the average generation time is 30 minutes. If the population is doubling every 10 minutes, what is the growth rate cons\tant (r) in units of 1/min?
A. 0.0693
Correct B. 0.693
C. 6.93
D. 69.3

Correct Answer: B

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Question 7
A 2.5 L solution of 0.5 M NaCl is diluted to 5 L. What is the new concentration of NaCl in the solution?
A. 0.1 M
B. 0.2 M
Correct C. 0.25 M
D. 0.5 M

Correct Answer: C

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Question 8
A plant has a photosynthetic rate of 10 μmol CO2/s. If the concentration of CO2 is 400 ppm, what is the rate of photosynthesis in units of μmol CO2/m2/s?
A. 0.004
B. 0.04
Correct C. 0.4
D. 4

Correct Answer: C

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Question 9
A 50 g sample of glu\cose is dissolved in 100 mL of water. What is the concentration of glu\cose in units of g/L?
A. 500 g/L
B. 5000 g/L
Correct C. 50 g/L
D. 50000 g/L

Correct Answer: C

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Question 10
A 5 L solution of 0.2 M NaOH is mixed with 2 L of 0.1 M HCl. What is the pH of the resulting solution?
A. 7
Correct B. 8
C. 9
D. 10

Correct Answer: B

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Question 11
The nervous system is responsible for transmitting signals from sensory receptors to the brain. Which of the following types of neurons is primarily involved in this process?
Correct A. Sensory neurons
B. Motor neurons
C. Interneurons
D. Association neurons

Correct Answer: A

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Question 12
The diagram below shows a cross-section of a plant root. Which of the following structures is responsible for absorbing water and minerals from the soil?
A. A
Correct B. B
C. C
D. D

Correct Answer: B

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Question 13
The process of meiosis results in the production of gametes with half the number of chromosomes as the parent cell. Which of the following stages of meiosis is responsible for this reduction in chromosome number?
A. Prophase I
B. Metaphase I
Correct C. Anaphase I
D. Telophase II

Correct Answer: C

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Question 14
The diagram below shows a graph of the relationship between the concentration of a subs\tance and the rate of reaction. Which of the following types of reaction is represented by this graph?
Correct A. Enzyme-catalyzed reaction
B. Oxidation-reduction reaction
C. Acid-base reaction
D. Precipitation reaction

Correct Answer: A

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Question 15
The process of mitosis results in the production of two daughter cells that are genetically identical to the parent cell. Which of the following stages of mitosis is responsible for the separation of chromosomes into the daughter cells?
A. Prophase
B. Metaphase
Correct C. Anaphase
D. Telophase

Correct Answer: C

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Question 16
The structure of the human eye is adapted for the detection of light and color. Which part of the eye is responsible for focu\sing light onto the retina?
A. Cornea
B. Iris
Correct C. Lens
D. Retina

Correct Answer: C

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Question 17
The classification of living organisms is based on their evolutionary relationships. Which of the following is an example of a monophyletic group?
Correct A. Mammals
B. Birds
C. Reptiles
D. Amphibians

Correct Answer: A

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Question 18
The human body is composed of various types of tissues, including epithelial, connective, muscle, and nervous tissues. Which of the following is a characteristic of epithelial tissue?
A. It is found in the dermis layer of the skin
B. It is composed of muscle cells
C. It is found in the connective tissue layer of the skin
Correct D. It is composed of epithelial cells

Correct Answer: D

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Question 19
The human body has a complex system of transport, including the circulatory and respiratory systems. Which of the following is a function of the circulatory system?
Correct A. To transport oxygen to the body's cells
B. To transport nutrients to the body's cells
C. To transport waste products from the body's cells
D. To regulate body temperature

Correct Answer: A

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Question 20
The human body has a complex system of growth and development, including the regulation of cell growth and division. Which of the following is a type of cell division?
Correct A. Mitosis
B. Meiosis
C. Binary fission
D. Endoreduplication

Correct Answer: A

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Question 21
In a eukaryotic cell, the process of cell division that results in the production of four daughter cells, each with the same number and kind of chromosomes as the parent cell, is called
Correct A. Mitosis
B. Meiosis
C. Binary Fission
D. Endospore Formation

Correct Answer: A

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Question 22
The process by which plants make their own food from sunlight is called
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Translocation

Correct Answer: B

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Question 23
The type of tissue that is found in the walls of blood vessels and is responsible for the contraction and relaxation of the vessels is called
A. Epithelial Tissue
B. Connective Tissue
Correct C. Muscle Tissue
D. Nervous Tissue

Correct Answer: C

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Question 24
The system of the body that is responsible for the production of hormones that regulate growth and development is called
A. Nervous System
Correct B. Endocrine System
C. Circulatory System
D. Respiratory System

Correct Answer: B

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Question 25
The process by which an organism's genetic information is passed from one generation to the next is called
A. Mutation
B. Genetic Drift
C. Gene Flow
Correct D. Heritability

Correct Answer: D

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