POST UTME CRAWFORD UNIVERSITY 2019 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. 0.36
B. 0.64
C. 0.72
D. 0.84

Correct Answer: A

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Question 2 View Details
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 3 View Details
SHARED STIMULUS
[pH, Activity] = [(6, 0.5), (7, 1), (8, 1.5), (9, 2), (10, 2.5), (11, 3)]
In a study on the effect of pH on enzyme activity, the following data were collected:
A. pH 7
Correct B. pH 9
C. pH 11
D. pH 13

Correct Answer: B

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Question 4 View Details
A diagram of a human eye is shown below. Identify the part labeled 'B'.
A. Cornea
Correct B. Iris
C. Lens
D. Retina

Correct Answer: B

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Question 5 View Details
In a population of E. coli, the frequency of the recessive allele 'b' is 0.1. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'bb'?
A. 0.01
Correct B. 0.09
C. 0.19
D. 0.29

Correct Answer: B

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Question 6 View Details
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
Correct C. No gene flow
D. No genetic drift

Correct Answer: C

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Question 7 View Details
The diagram below shows a cross-section of a plant root.
A. The root hair cells are responsible for absorbing water and minerals from the soil.
B. The root cap protects the root from injury as it grows through the soil.
Correct C. The xylem transports water and minerals from the roots to the rest of the plant.
D. The phloem transports sugars and other organic compounds produced by photosynthesis.

Correct Answer: C

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Question 8 View Details
The process of cellular respiration can be represented by the equation: \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \). What is the net ATP yield from the complete breakdown of one glu\cose molecule?
A. 36 ATP
B. 38 ATP
Correct C. 40 ATP
D. 42 ATP

Correct Answer: C

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Question 9 View Details
The diagram below shows a simple e\cosystem.
Correct A. The plant is the primary producer and the animal is the primary consumer.
B. The animal is the primary producer and the plant is the primary consumer.
C. The plant and animal are both primary producers.
D. The plant and animal are both primary consumers.

Correct Answer: A

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Question 10 View Details
The human body has a unique ability to maintain a stable internal environment despite changes in the external environment. This ability is known as homeostasis. Which of the following is an example of a negative feedback mechanism that helps to maintain homeostasis?
A. Thermoregulation
B. Osmoregulation
Correct C. Blood pressure regulation
D. Respiratory rate regulation

Correct Answer: C

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Question 11 View Details
In the context of hormonal coordination, what is the primary function of the hypothalamus?
A. Regulation of body temperature
B. Control of hunger and thirst
Correct C. Regulation of hormone secretion
D. Maintenance of blood pressure

Correct Answer: C

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Question 12 View Details
A plant is placed in a solution containing 0.1 M glu\cose. If the plant absorbs 5 mL of the solution in 10 minutes, what is the total amount of glu\cose absorbed?
A. 0.25 mmol
Correct B. 0.5 mmol
C. 1 mmol
D. 2 mmol

Correct Answer: B

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Question 13 View Details
A diagram of a plant's xylem is shown below. What is the primary function of the xylem?
Correct A. Transport of water and minerals
B. Transport of glu\cose and amino acids
C. Support and storage of plant cells
D. Protection of plant cells from pathogens

Correct Answer: A

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Question 14 View Details
A diagram of a human e\cosystem is shown below. What is the primary producer in this e\cosystem?
Correct A. Plant
B. Herbivore
C. Carnivore
D. Decomposer

Correct Answer: A

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Question 15 View Details
A diagram of a human cell is shown below. What is the primary function of the mitochondria?
Correct A. Production of ATP
B. Regulation of cell growth
C. Transport of materials across the cell membrane
D. Defense against pathogens

Correct Answer: A

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Question 16 View Details
In a tropical rainforest, the primary consumers are typically small animals that feed on the primary producers. Which of the following is NOT a primary consumer in this e\cosystem?
A. Fruit bats
B. Fruit flies
C. Fruit worms
Correct D. Fruit trees

Correct Answer: D

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Question 17 View Details
In asexual reproduction, the offspring are genetically identical to the parent. Which of the following is an example of asexual reproduction?
Correct A. Binary fission
B. Mitosis
C. Meiosis
D. Fertilization

Correct Answer: A

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Question 18 View Details
In the process of cellular respiration, which of the following is the byproduct of glycolysis?
A. ATP
B. NADH
C. FADH2
Correct D. Pyruvate

Correct Answer: D

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Question 19 View Details
In the process of photosynthesis, which of the following is the byproduct of the light-dep\endent reactions?
Correct A. ATP
B. NADPH
C. O2
D. H2O

Correct Answer: A

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Question 20 View Details
In the process of mitosis, which of the following is the stage where the chromosomes are condensed and aligned at the metaphase plate?
A. Prophase
Correct B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: B

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Question 21 View Details
The process of osmoregulation in animals involves the regulation of water and salt balance in the body. Which of the following is a key mechanism involved in osmoregulation?
Correct A. The reabsorption of water and ions in the kidneys
B. The excretion of excess salt through the skin
C. The regulation of hormone levels in the body
D. The movement of ions across cell membranes

Correct Answer: A

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Question 22 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. Natural selection
Correct D. Heritability

Correct Answer: D

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Question 23 View Details
The xylem is a type of vascular tissue found in plants that is responsible for transporting water and minerals from the roots to the leaves. Which of the following is a key component of the xylem?
A. Tracheids
Correct B. Vessel elements
C. Xylem parenchyma
D. Phloem fibers

Correct Answer: B

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Question 24 View Details
The nervous system is responsible for transmitting signals throughout the body. Which of the following is a key type of neuron found in the nervous system?
A. Motor neuron
B. Sensory neuron
Correct C. Interneuron
D. Glia cell

Correct Answer: C

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Question 25 View Details
The process of excretion involves the removal of waste products from the body. Which of the following is a key organ involved in excretion?
Correct A. Kidneys
B. Liver
C. Lungs
D. Skin

Correct Answer: A

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