POST UTME CRAWFORD UNIVERSITY 2024 Biology | Objective

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Question 1
In a tropical rainforest, the primary consumers are primarily composed of which of the following?
Correct A. Herbivorous insects
B. Fruit-eating birds
C. Small mammals
D. Decomposers

Correct Answer: A

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Question 2
The process by which plants release water vapor into the air is known as?
Correct A. Transpiration
B. Respiration
C. Photosynthesis
D. Evaporation

Correct Answer: A

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Question 3
In a desert e\cosystem, the primary producers are primarily composed of which of the following?
Correct A. Cacti and succulents
B. Desert grasses
C. Desert shrubs
D. Mosses and lichens

Correct Answer: A

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Question 4
The process by which an organism's genetic information is passed from one generation to the next is known as?
A. Mutation
B. Genetic drift
C. Natural selection
Correct D. Heritability

Correct Answer: D

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Question 5
In a coral reef e\cosystem, the primary consumers are primarily composed of which of the following?
Correct A. Fish
B. Invertebrates
C. Algae
D. Bacteria

Correct Answer: A

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Question 6
In a population of 1000 individuals, 80% are heterozygous for a particular gene, while 20% are homozygous recessive. If two individuals are randomly selected from this population, what is the probability that they will both be heterozygous?
Correct A. 0.32
B. 0.48
C. 0.64
D. 0.80

Correct Answer: A

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Question 7
A researcher is studying the effect of pH on the growth of a microorganism. The researcher observes that the microorganism grows best at a pH of 7.0. However, at a pH of 5.0, the microorganism grows slowly, and at a pH of 9.0, the microorganism does not grow at all. What is the most likely reason for this phenomenon?
Correct A. The microorganism is sensitive to pH.
B. The microorganism is sensitive to temperature.
C. The microorganism is sensitive to light.
D. The microorganism is sensitive to oxygen.

Correct Answer: A

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Question 8
A diagram of a plant cell is shown below. What is the function of the structure labeled 'A'?
A. To synthesize proteins.
Correct B. To store genetic information.
C. To regulate cell growth.
D. To transport materials.

Correct Answer: B

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Question 9
A diagram of a simple e\cosystem is shown below. What is the role of the structure labeled 'B'?
Correct A. To produce organic matter.
B. To consume organic matter.
C. To decompose organic matter.
D. To regulate population growth.

Correct Answer: A

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Question 10
A researcher is studying the effect of antibiotics on the growth of a microorganism. The researcher observes that the microorganism grows slowly in the presence of antibiotics. What is the most likely reason for this phenomenon?
Correct A. The microorganism is sensitive to antibiotics.
B. The microorganism is resis\tant to antibiotics.
C. The microorganism is sensitive to pH.
D. The microorganism is sensitive to temperature.

Correct Answer: A

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Question 11
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. 0.04

Correct Answer: A

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Question 12
A bio\logist is studying the effect of pH on the growth of Escherichia coli. She measures the growth rate of the bacteria at different pH levels and plots the data on a graph. Which of the following types of graphs would best represent the relationship between pH and growth rate?
Correct A. \( y = \frac{1}{1 + e^{-x}} \)
B. \( y = e^x \)
C. \( y = \log\( x \ \))
D. \( y = x^2 \)

Correct Answer: A

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Question 13
A cell is placed in a solution with a concentration of 0.1 M glu\cose. The cell is able to transport glu\cose into the cell u\sing facilitated diffusion. What is the concentration of glu\cose in the cell after 10 minutes?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 14
A population of rabbits is growing according to the \logistic growth model. The initial population size is 100, and the carrying capacity is 1000. What is the population size after 5 years?
A. 500
B. 750
C. 900
Correct D. 950

Correct Answer: D

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Question 15
A bio\logist is studying the effect of temperature on the growth of a microorganism. She measures the growth rate of the microorganism at different temperatures and plots the data on a graph. Which of the following types of graphs would best represent the relationship between temperature and growth rate?
A. \( y = \frac{1}{1 + e^{-x}} \)
Correct B. \( y = e^x \)
C. \( y = \log\( x \ \))
D. \( y = x^2 \)

Correct Answer: B

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Question 16
The process of meiosis in eukaryotic cells results in the production of four haploid daughter cells. Which of the following statements is true regarding the genetic variation introduced during meiosis?
A. Meiosis introduces genetic variation through the shuffling of alleles during cros\sing over.
B. Meiosis introduces genetic variation through the random assortment of chromosomes during gamete formation.
C. Meiosis introduces genetic variation through the mutation of alleles during DNA replication.
Correct D. Meiosis introduces genetic variation through the recombination of genes during the prophase I stage.

Correct Answer: D

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Question 17
A researcher is studying the effect of a new antibiotic on the growth of E. coli bacteria. The researcher observes that the bacteria are resis\tant to the antibiotic. Which of the following mechanisms is most likely responsible for the resis\tance?
A. The bacteria have developed a mutation in the antibiotic target protein.
Correct B. The bacteria have produced an enzyme that inactivates the antibiotic.
C. The bacteria have developed a permeability barrier that prevents the antibiotic from entering the cell.
D. The bacteria have developed a mechanism to pump the antibiotic out of the cell.

Correct Answer: B

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Question 18
A patient is diagnosed with a rare genetic disorder that affects the production of a hormone essential for growth and development. The patient's hormone levels are measured and found to be significantly lower than normal. Which of the following statements is true regarding the patient's condition?
Correct A. The patient's condition is caused by a mutation in the gene encoding the hormone.
B. The patient's condition is caused by a deficiency in the hormone's receptor.
C. The patient's condition is caused by a problem with the hormone's production pathway.
D. The patient's condition is caused by a lack of feedback inhibition on the hormone's production.

Correct Answer: A

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Question 19
A cell is placed in a hypotonic solution, cau\sing it to swell. Which of the following statements is true regarding the cell's response?
A. The cell will undergo \endocytosis to remove excess water.
B. The cell will undergo exocytosis to release excess water.
Correct C. The cell will undergo osmosis to equalize the concentration of solutes.
D. The cell will undergo diffusion to move solutes from an area of high concentration to an area of low concentration.

Correct Answer: C

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Question 20
A population of bacteria is growing in a controlled environment. The population size is measured over time and found to be increa\sing exponentially. Which of the following statements is true regarding the population's growth?
A. The population is growing at a cons\tant rate.
Correct B. The population is growing at an exponential rate.
C. The population is growing at a linear rate.
D. The population is growing at a \logistic rate.

Correct Answer: B

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Question 21
The diagram below shows a cross-section of a xylem vessel. What is the function of the lignified cells labeled 'A'?
Correct A. To provide structural support to the xylem vessel
B. To transport water and minerals from the roots to the leaves
C. To store food and nutrients in the xylem vessel
D. To regulate the rate of transpiration in the xylem vessel

Correct Answer: A

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Question 22
A geneticist is studying the inheri\tance of a trait in a population of pea plants. The trait is controlled by a \single gene with two alleles, one dominant and one recessive. If the genotype of the parent plant is 'Bb', what is the probability that the offspring will be homozygous recessive?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 23
The diagram below shows a cross-section of the human eye. What is the function of the structure labeled 'C'?
Correct A. To focus light onto the retina
B. To regulate the amount of light entering the eye
C. To detect changes in light intensity
D. To produce tears to lubricate the eye

Correct Answer: A

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Question 24
A bio\logist is studying the structure of a cell. The cell has a cell membrane, cytoplasm, and a nucleus. What is the function of the cell membrane?
Correct A. To regulate the movement of materials in and out of the cell
B. To provide structural support to the cell
C. To store genetic information in the cell
D. To produce energy for the cell

Correct Answer: A

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Question 25
A geneticist is studying the inheri\tance of a trait in a population of fruit flies. The trait is controlled by a \single gene with two alleles, one dominant and one recessive. If the genotype of the parent fly is 'Bb', what is the probability that the offspring will be homozygous dominant?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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