Practice Post UTME RHEMA 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. 0.64

B. 0.36

C. 0.16

D. 0.04

Correct Answer: A

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Question 2

A diagram of a plant cell is shown below. Identify the part labeled 'B'.

A. Mitochondria

Correct B. Nucleus

C. Ribosome

D. Lysosome

Correct Answer: B

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Question 3

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 frequency of the bird's wing beat per second?

A. 2.5 Hz

B. 5 Hz

Correct C. 10 Hz

D. 20 Hz

Correct Answer: C

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Question 4

A diagram of a simple harmonic motion is shown below. Identify the part labeled 'A'.

Correct A. Spring

B. Mass

C. Damping Force

D. Friction

Correct Answer: A

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Question 5

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

A. 80 mg

B. 160 mg

C. 320 mg

Correct D. 640 mg

Correct Answer: D

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Question 6

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. 0.8

D. 0.16

Correct Answer: B

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Question 7

A species of bird has a beak length of 10 cm. If the beak length is normally distributed with a mean of 12 cm and a s\tandard deviation of 2 cm, what is the probability that a randomly selected bird will have a beak length greater than 14 cm?

Correct A. 0.1587

B. 0.3413

C. 0.5

D. 0.8413

Correct Answer: A

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Question 8

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

Correct A. 1628.89

B. 2000

C. 2500

D. 3000

Correct Answer: A

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Question 9

A species of plant has a photosynthetic rate of 10 mg CO2/h. If the light intensity is increased by 50%, what is the new photosynthetic rate?

A. 5

B. 10

Correct C. 15

D. 20

Correct Answer: C

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Question 10

A species of fish has a respiratory rate of 20 breaths/min. If the water temperature is increased by 10°C, what is the new respiratory rate?

A. 15

B. 20

Correct C. 25

D. 30

Correct Answer: C

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Question 11

The process of photosynthesis in plants involves the conversion of light energy into chemical energy in the form of glu\cose. Which of the following is a byproduct of this process?

Correct A. Oxygen

B. Carbon dioxide

C. Water

D. Nitrogen

Correct Answer: A

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Question 12

In the context of evolutionary theory, what is the term for the process by which a species becomes reproductively isolated from other species?

Correct A. Speciation

B. Adaptation

C. Mutation

D. Genetic drift

Correct Answer: A

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Question 13

The human respiratory system is responsible for exchanging gases between the body and the environment. Which of the following is a critical component of this process?

A. Lungs

B. Trachea

Correct C. Diaphragm

D. Bronchi

Correct Answer: C

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Question 14

In the context of classification of living things, what is the term for the study of the structure and organization of living organisms?

A. Taxonomy

B. Phy\logeny

C. Anatomy

Correct D. Morpho\logy

Correct Answer: D

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Question 15

The process of digestion in the human body involves the breakdown of food into smaller molecules that can be absorbed and utilized by the body. Which of the following enzymes plays a critical role in this process?

A. Amylase

B. Lipase

Correct C. Tryp\sin

D. Pep\sin

Correct Answer: C

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Question 16

In the context of the human visual system, what is the primary function of the optic nerve?

Correct A. To transmit visual information from the retina to the brain

B. To regulate the amount of light entering the eye

C. To focus light onto the retina

D. To detect movement in the visual field

Correct Answer: A

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Question 17

A plant's xylem is responsible for transporting water and minerals from the roots to the leaves. What is the primary mechanism by which this transport occurs?

Correct A. Transpiration pull

B. Root pressure

C. Capillary action

D. Osmosis

Correct Answer: A

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Question 18

A patient is diagnosed with a bacterial infection. The bacteria are gram-positive and have a characteristic 'chain of beads' appearance under the microscope. What is the most likely cause of the infection?

A. Staphylococcus aureus

Correct B. Streptococcus pneumoniae

C. Escherichia coli

D. Pseudomonas aeruginosa

Correct Answer: B

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Question 19

A plant grows in a controlled environment with limited light. To optimize its growth, what is the most effective way to increase the plant's photosynthetic rate?

A. Increase the temperature

Correct B. Increase the light intensity

C. Increase the CO2 concentration

D. Increase the water availability

Correct Answer: B

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Question 20

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

Correct A. To absorb water and minerals from the soil

B. To anchor the plant in the soil

C. To produce hormones that regulate plant growth

D. To store food for the plant

Correct Answer: A

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Question 21

The kidneys play a crucial role in osmoregulation by regulating the concentration of what in the blood?

A. sodium ions

B. potassium ions

Correct C. water

D. urea

Correct Answer: C

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Question 22

The process by which the nervous system coordinates the contraction of skeletal muscles is called what?

A. synaptic transmission

B. neurotransmission

C. muscle contraction

Correct D. reflex arc

Correct Answer: D

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Question 23

In genetics, what is the term for the process by which a gene is turned off or silenced?

A. gene expression

B. gene regulation

Correct C. gene silencing

D. gene mutation

Correct Answer: C

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Question 24

The classification of living things into kingdoms is based on what characteristic?

Correct A. cell structure

B. metabolism

C. cell wall composition

D. DNA structure

Correct Answer: A

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Question 25

In eco\logy, what is the term for the process by which plants convert light energy into chemical energy?

Correct A. photosynthesis

B. respiration

C. transpiration

D. translocation

Correct Answer: A

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