Practice post utme aaua biology 2023 Past Questions

Question 1

In a tropical rainforest, the primary producers are primarily composed of which of the following?

A. Grasses and other herbaceous plants

Correct B. Tall trees and shrubs

C. Cacti and succulents

D. Mosses and liverworts

Correct Answer: B

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Question 2

The process by which plants convert light energy into chemical energy is known as?

Correct A. Photosynthesis

B. Respiration

C. Transpiration

D. Osmosis

Correct Answer: A

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Question 3

The diagram below shows a cross-section of a plant root. Which of the following tissues is responsible for the absorption of water and minerals?

Correct A. Xylem

B. Cortex

C. Endodermis

D. Pericycle

Correct Answer: A

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Question 4

The genetic principle that states that the characteristics of an organism are determined by the interaction of two or more genes is known as?

A. Incomplete dominance

B. Codominance

C. Epistasis

Correct D. Polygenic inheri\tance

Correct Answer: D

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Question 5

The diagram below shows a simple circuit. Which of the following components is responsible for the flow of electrons?

A. Battery

B. Resistor

Correct C. Wire

D. Switch

Correct Answer: C

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Question 6

In the context of evolutionary theory, what is the primary mechanism by which genetic variation is introduced into a population?

Correct A. Mutation

B. Gene flow

C. Genetic drift

D. Natural selection

Correct Answer: A

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Question 7

A diagram of the human eye is shown below. Which part of the eye is responsible for adjusting the size of the pupil?

A. A

B. B

Correct C. C

D. D

Correct Answer: C

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Question 8

In a population of 100 individuals, 20 have the genotype AA, 40 have the genotype Aa, and 40 have the genotype aa. What is the frequency of the recessive allele 'a'?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 9

A diagram of a plant cell is shown below. Which part of the cell is responsible for photosynthesis?

A. A

B. B

Correct C. C

D. D

Correct Answer: C

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Question 10

In a species of bird, the wing length is normally distributed with a mean of 10 cm and a s\tandard deviation of 2 cm. What is the probability that a randomly selected bird will have a wing length greater than 12 cm?

Correct A. 0.0228

B. 0.1587

C. 0.3413

D. 0.5

Correct Answer: A

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Question 11

In a typical terrestrial e\cosystem, what is the primary mechanism by which plants convert light energy into chemical energy?

A. Respiration

Correct B. Photosynthesis

C. Decomposition

D. Fermentation

Correct Answer: B

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Question 12

A 2.5 L solution of 0.15 M NaCl is diluted to 5 L. What is the new concentration of NaCl?

Correct A. 0.075 M

B. 0.15 M

C. 0.3 M

D. 0.45 M

Correct Answer: A

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Question 13

A population of 500 rabbits is introduced to a new habitat. The population grows at a rate of 20% per year. What is the population after 3 years?

A. 900

B. 1000

Correct C. 1200

D. 1500

Correct Answer: C

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Question 14

A 10 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 15

A 5 L solution of 0.1 M HCl is mixed with a 3 L solution of 0.2 M NaOH. What is the resulting pH?

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 16

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'?

A. 0.2

B. 0.4

C. 0.6

Correct D. 0.8

Correct Answer: D

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Question 17

A cell is placed in a medium containing 0.1 M glu\cose and 0.1 M fructose. If the cell is able to transport glu\cose but not fructose, what will be the concentration of glu\cose in the cell after 1 hour?

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 18

A plant has a genotype of 'RR' and is crossed with a plant having the genotype 'rr'. What is the probability that the offspring will have the genotype 'Rr'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 19

A nerve impulse travels from the d\endrite to the axon hillock. What is the direction of the impulse?

Correct A. From d\endrite to axon hillock

B. From axon hillock to d\endrite

C. In a circular motion

D. In a zigzag motion

Correct Answer: A

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Question 20

A muscle fiber is stimulated to contract. What is the sequence of events that occurs?

Correct A. Stimulation → Depolarization → Action Potential → Contraction

B. Stimulation → Action Potential → Depolarization → Contraction

C. Stimulation → Contraction → Depolarization → Action Potential

D. Stimulation → Depolarization → Contraction → Action Potential

Correct Answer: A

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Question 21

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. 0.88

Correct Answer: A

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Question 22

A researcher is studying the effect of pH on the growth of E. coli. The researcher 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 data?

A. Line graph

B. Bar graph

Correct C. Scatter plot

D. Histogram

Correct Answer: C

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Question 23

A plant has a genotype of 'Rr' for the flower color gene. What is the probability that the plant will produce a seed with the genotype 'RR'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 1.0

Correct Answer: B

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Question 24

A researcher is studying the effect of temperature on the growth of a microorganism. The researcher 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 data?

A. Line graph

B. Bar graph

Correct C. Scatter plot

D. Histogram

Correct Answer: C

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Question 25

A plant has a genotype of 'Rr' for the flower color gene. What is the probability that the plant will produce a seed with the genotype 'rr'?

Correct A. 0.25

B. 0.5

C. 0.75

D. 1.0

Correct Answer: A

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