Practice post utme nile university biology 2021 Past Questions

Question 1

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

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

Correct A. Xylem

B. Phloem

C. Cortex

D. Endodermis

Correct Answer: A

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Question 3

A population of E. coli is grown in a nutrient-rich medium. The growth curve of the population is shown below. What is the phase of growth during which the population is increa\sing exponentially?

A. Lag phase

Correct B. Log phase

C. Stationary phase

D. Decline phase

Correct Answer: B

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Question 4

The diagram below shows a simple harmonic motion. What is the amplitude of the motion?

A. 2 cm

Correct B. 4 cm

C. 6 cm

D. 8 cm

Correct Answer: B

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Question 5

A solution of 0.1 M NaCl is prepared by dissolving 5.85 g of NaCl in 1 L of water. What is the concentration of the solution in mol/L?

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 6

In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is triggered by the activation of the

A. anaphase-promoting complex (APC)

Correct B. cyclin-dep\endent kinase (CDK)

C. histone deacetylase (HDAC)

D. proteasome

Correct Answer: B

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Question 7

A plant cell has a cell wall composed of cellulose, hemicellulose, and pectin. Which of the following is NOT a function of the cell wall?

A. providing structural support

B. regulating gas exchange

C. controlling water loss

Correct D. facilitating cell division

Correct Answer: D

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Question 8

A genetic trait is determined by a \single gene with two alleles, one dominant and one recessive. If an individual has the genotype

A. AA or Aa

Correct B. aa

C. Aa or aa

D. AA or aa

Correct Answer: B

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Question 9

A diagram of a cell membrane is shown below. Which of the following is a characteristic of the cell membrane?

Correct A. selectively permeable

B. impermeable

C. rigid

D. flexible

Correct Answer: A

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Question 10

A diagram of a plant root is shown below. Which of the following is a function of the root hair?

Correct A. absorbing water and minerals

B. producing hormones

C. supporting the plant

D. regulating gas exchange

Correct Answer: A

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Question 11

In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant plant life. However, some primary consumers are carnivores that feed on other primary consumers. Which of the following is an example of a carnivorous primary consumer in a tropical rainforest?

Correct A. A snake that feeds on a lizard

B. A lizard that feeds on a leaf

C. A bird that feeds on a fruit

D. A frog that feeds on a mosquito

Correct Answer: A

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Question 12

The nervous system of an organism consists of two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS includes the brain and spinal cord, while the PNS includes nerves that connect the CNS to the rest of the body. Which of the following is a function of the PNS?

A. Regulation of body temperature

Correct B. Transmission of nerve impulses

C. Production of hormones

D. Maintenance of posture

Correct Answer: B

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Question 13

The human eye has several sense organs that work together to enable us to see the world around us. Which of the following sense organs is responsible for detecting light and transmitting signals to the brain?

A. Cornea

B. Iris

Correct C. Retina

D. Lens

Correct Answer: C

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Question 14

In genetics, heredity refers to the pas\sing of traits from parents to offspring through the transmission of genetic information. Which of the following is an example of a trait that is determined by a \single gene?

A. Eye color

B. Hair color

C. Height

Correct D. Blood type

Correct Answer: D

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Question 15

Photosynthesis is the process by which plants, algae, and some bacteria convert light energy from the sun into chemical energy in the form of glu\cose. Which of the following is a byproduct of photosynthesis?

Correct A. Oxygen

B. Carbon dioxide

C. Water

D. Nitrogen

Correct Answer: A

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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'?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 17

A researcher is studying the effect of pH on the growth of E. coli. The graph below shows the growth of E. coli at different pH levels. What is the pH level at which the growth rate is maximum?

A. 6.5

Correct B. 7.0

C. 7.5

D. 8.0

Correct Answer: B

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Question 18

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 power output of the bird?

A. 100 W

B. 200 W

Correct C. 500 W

D. 1000 W

Correct Answer: C

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Question 19

A researcher is studying the effect of temperature on the growth of a microorganism. The graph below shows the growth of the microorganism at different temperatures. What is the temperature at which the growth rate is maximum?

A. 30°C

B. 35°C

Correct C. 40°C

D. 45°C

Correct Answer: C

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Question 20

A species of fish has a body length of 0.5 meters. If the fish is swimming at a speed of 20 km/h, what is the power output of the fish?

A. 50 W

B. 100 W

Correct C. 200 W

D. 500 W

Correct Answer: C

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Question 21

In a tropical rainforest, the presence of a large number of microorganisms in the soil is due to the high levels of which of the following?

A. Temperature

B. Humidity

C. pH

Correct D. Organic matter

Correct Answer: D

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Question 22

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

A. Respiration

Correct B. Photosynthesis

C. Transpiration

D. Evaporation

Correct Answer: B

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Question 23

The type of tissue that connects, supports, and binds other tissues together is known as?

A. Epithelial tissue

Correct B. Connective tissue

C. Muscle tissue

D. Nervous tissue

Correct Answer: B

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Question 24

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. Gene flow

Correct D. Heritability

Correct Answer: D

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Question 25

The type of reproduction in which an organism produces offspring without the involvement of gametes is known as?

A. Mitosis

B. Meiosis

Correct C. Binary fission

D. Budding

Correct Answer: C

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