Practice post utme esut biology 2018 Past Questions

Question 1

In the context of the human eye, what is the primary function of the ciliary muscles?

Correct A. To contract and relax the lens

B. To regulate the amount of light entering the eye

C. To focus light on the retina

D. To control the shape of the cornea

Correct Answer: A

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Question 2

A plant's xylem is responsible for transporting water and minerals from the roots to the leaves through the process of

A. Transpiration

B. Photosynthesis

C. Osmosis

Correct D. Capillary action

Correct Answer: D

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Question 3

The process of cell division that results in the production of four daughter cells, each with the same number of chromosomes as the parent cell, is called

Correct A. Mitosis

B. Meiosis

C. Binary fission

D. Endoreduplication

Correct Answer: A

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Question 4

The diagram below shows the structure of a typical plant cell. Identify the organelle responsible for protein synthesis.

A. Mitochondria

B. Chloroplast

Correct C. Ribosome

D. Lysosome

Correct Answer: C

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Question 5

The theory of evolution by natural selection was first proposed by

Correct A. Charles Darwin

B. Gregor M\endel

C. Jean-Baptiste Lamarck

D. Alfred Russel Wallace

Correct Answer: A

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Question 6

In a population of 1000 individuals, 70% are heterozygous for the gene controlling the production of a certain enzyme, while 30% are homozygous recessive. If the gene is inherited in an autosomal recessive manner, what is the frequency of the recessive allele?

Correct A. 0.15

B. 0.20

C. 0.25

D. 0.30

Correct Answer: A

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Question 7

A certain species of plant has a growth rate of 2.5 cm/day. If the plant is 15 cm tall after 5 days, what is its growth rate?

A. 2.0 cm/day

Correct B. 2.5 cm/day

C. 3.0 cm/day

D. 3.5 cm/day

Correct Answer: B

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Question 8

A diagram of a plant's root system is shown below. What is the function of the root labeled 'A'?

Correct A. absorbing water and nutrients from the soil

B. anchoring the plant in the soil

C. producing hormones that regulate plant growth

D. storing food for the plant

Correct Answer: A

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Question 9

A certain species of animal has a population growth rate of 20% per year. If the population is 1000 individuals initially, what will be the population after 5 years?

A. 1638

B. 1862

Correct C. 2000

D. 2200

Correct Answer: C

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Question 10

A diagram of a cell's structure is shown below. What is the function of the organelle labeled 'B'?

Correct A. producing energy for the cell

B. regulating cell growth and division

C. storing genetic information

D. transporting subs\tances into and out of the cell

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'?

A. 0.36

Correct B. 0.64

C. 0.48

D. 0.52

Correct Answer: B

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Question 12

A cell in the G2 phase of the cell cycle has a DNA content of 8C. What is the stage of the cell cycle that the cell will enter next?

A. G1

B. S

C. G2

Correct D. M

Correct Answer: D

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Question 13

A species of bird has a beak length of 5 cm. If the beak length is directly proportional to the square root of the bird's body mass, and the bird's body mass is 100 g, what is the beak length of a bird with a body mass of 400 g?

A. 5

Correct B. 10

C. 15

D. 20

Correct Answer: B

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Question 14

A population of bacteria is growing exponentially with a growth rate of 0.5 per hour. If the initial population size is 1000 cells, what is the population size after 3 hours?

A. 1000

B. 1500

Correct C. 2250

D. 3000

Correct Answer: C

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Question 15

A species of plant has a photosynthetic rate of 10 mg CO2 per hour. If the plant is exposed to light for 8 hours, what is the total amount of CO2 fixed by the plant?

A. 5

B. 10

C. 20

Correct D. 80

Correct Answer: D

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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. 0.36

Correct B. 0.64

C. 0.72

D. 0.80

Correct Answer: B

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Question 17

A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell is in a culture medium with a glu\cose concentration of 1 g/L, what is the rate of glu\cose uptake by the cell?

Correct A. 0.125 g/L

B. 0.250 g/L

C. 0.500 g/L

D. 1.000 g/L

Correct Answer: A

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Question 18

A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If a random sample of 50 individuals is taken from this population, what is the probability that the sample mean height is greater than 175 cm?

Correct A. 0.0576

B. 0.0960

C. 0.1440

D. 0.1920

Correct Answer: A

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Question 19

A plant has a photosynthetic rate of 10 mg CO2/h. If the concentration of CO2 in the air is 400 ppm, what is the rate of photosynthesis?

A. 20 ppm

Correct B. 40 ppm

C. 60 ppm

D. 80 ppm

Correct Answer: B

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Question 20

A river has a flow rate of 1000 m3/s and a water temperature of 20°C. If the river is 10 km long, what is the rate of heat transfer?

Correct A. 836400 W

B. 1672800 W

C. 2512000 W

D. 3350400 W

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 size is 1000, what is the expected number of homozygous recessive individuals?

Correct A. 0.4

B. 0.8

C. 1.6

D. 2.0

Correct Answer: A

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Question 22

A researcher is studying the effect of pH on the growth of Escherichia 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 statements is true about the graph?

A. The graph is a straight line.

Correct B. The graph is a curve.

C. The graph has a peak at pH 7.

D. The graph has a trough at pH 7.

Correct Answer: B

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Question 23

A species of bird has a wing span of 1.5 meters. If the bird is flying at a speed of 50 km/h, what is the angular velocity of the bird's wings?

A. 10 rad/s

Correct B. 20 rad/s

C. 30 rad/s

D. 40 rad/s

Correct Answer: B

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Question 24

A researcher is studying the effect of temperature on the rate of chemical reaction. The researcher measures the rate of reaction at different temperatures and plots the data on a graph. Which of the following statements is true about the graph?

A. The graph is a straight line.

Correct B. The graph is a curve.

C. The graph has a peak at 50°C.

D. The graph has a trough at 50°C.

Correct Answer: B

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Question 25

A species of plant has a photosynthetic rate of 10 mg CO2/h. If the plant is exposed to light for 8 hours, how much CO2 is absorbed by the plant?

A. 80 mg

Correct B. 100 mg

C. 120 mg

D. 140 mg

Correct Answer: B

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