Practice Post UTME ACHIEVERS UNIVERSITY biology 2024 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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 2

A diagram shows a plant with 4 petals, 5 sepals, and 3 stamens. What is the correct classification of this plant?

A. Monocot

Correct B. Dicot

C. Gymnosperm

D. Angiosperm

Correct Answer: B

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Question 3

A cell is placed in a solution with a pH of 5.5. What is the concentration of hydrogen ions in this solution?

Correct A. 10^-5.5 M

B. 10^-5.0 M

C. 10^-4.5 M

D. 10^-6.5 M

Correct Answer: A

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Question 4

A diagram shows a circuit with a battery, a resistor, and a switch. If the switch is closed, what is the direction of the current flow?

Correct A. From the battery to the resistor

B. From the resistor to the battery

C. From the battery to the switch

D. From the switch to the resistor

Correct Answer: A

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Question 5

A diagram shows a graph with a parabola opening upwards. What is the equation of this parabola?

Correct A. y = x^2 + 2x + 1

B. y = x^2 - 2x - 1

C. y = x^2 + 4x + 4

D. y = x^2 - 4x - 4

Correct Answer: A

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Question 6

In a population of bacteria, the growth rate is modeled by the \logistic equation \( \frac{dP}{dt} = rPleft\( 1 - \frac{P}{K}\right \ \) ). If the carrying capacity ( K ) is 1000 and the initial population is 100, find the time ( t ) at which the population reaches 900.

A. \frac{1}{r}

B. \frac{1}{r} \ln\left\( \frac{900}{100}\right \)

Correct C. \frac{1}{r} \ln\left\( \frac{1000}{900}\right \)

D. \frac{1}{r} \ln\left\( \frac{900}{1000}\right \)

Correct Answer: C

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Question 7

A plant has a root system that consists of a taproot and a network of smaller roots. The taproot grows at a rate of 2 cm/day, while the smaller roots grow at a rate of 1 cm/day. If the taproot is 10 cm long and the smaller roots are 5 cm long, how long will it take for the taproot to be twice as long as the smaller roots?

A. 10 days

Correct B. 20 days

C. 30 days

D. 40 days

Correct Answer: B

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Question 8

A person has a blood pressure of 120/80 mmHg. If the systolic pressure is 20% higher than the diastolic pressure, what is the diastolic pressure?

A. 60 mmHg

Correct B. 80 mmHg

C. 100 mmHg

D. 120 mmHg

Correct Answer: B

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Question 9

A solution contains 2 M NaCl and 1 M glu\cose. If 10 mL of the solution is diluted to 100 mL, what is the concentration of NaCl in the final solution?

A. 0.2 M

Correct B. 0.5 M

C. 1 M

D. 2 M

Correct Answer: B

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Question 10

A plant has a root system that consists of a taproot and a network of smaller roots. The taproot grows at a rate of 2 cm/day, while the smaller roots grow at a rate of 1 cm/day. If the taproot is 10 cm long and the smaller roots are 5 cm long, how long will it take for the taproot to be twice as long as the smaller roots?

A. 10 days

Correct B. 20 days

C. 30 days

D. 40 days

Correct Answer: B

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Question 11

In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?

Correct A. To regulate the concentration of ions in the blood

B. To excrete excess water and maintain blood pressure

C. To reabsorb glu\cose and amino acids from the filtrate

D. To produce hormones that stimulate thirst

Correct Answer: A

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Question 12

Asexual reproduction in plants can occur through the production of

A. seeds

Correct B. spores

C. buds

D. runners

Correct Answer: B

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Question 13

The process of gas exchange in the lungs involves the diffusion of

A. oxygen into the blood

B. carbon dioxide out of the blood

Correct C. both oxygen and carbon dioxide

D. neither oxygen nor carbon dioxide

Correct Answer: C

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Question 14

The nervous system is responsible for

A. regulating body temperature

B. controlling blood pressure

Correct C. transmitting nerve impulses

D. producing hormones

Correct Answer: C

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Question 15

The hormone insulin is produced by the

Correct A. pancreas

B. adrenal glands

C. thyroid gland

D. pituitary gland

Correct Answer: A

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Question 16

In the context of hormonal coordination, what is the primary function of the hypothalamic-pituitary-adrenal (HPA) axis?

A. Regulation of body temperature

B. Maintenance of blood pressure

Correct C. Response to stress and regulation of the immune system

D. Control of appetite and satiety

Correct Answer: C

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Question 17

A researcher studying the eco\logy of a freshwater lake observes that the lake's water level is fluctuating between 10 and 20 meters. What is the most likely cause of this fluctuation?

A. Changes in precipitation patterns

B. Evaporation from the lake surface

C. Inflow of water from surrounding rivers

Correct D. Outflow of water through a nearby dam

Correct Answer: D

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Question 18

A population of birds is observed to have a mean beak length of 5 cm with a s\tandard deviation of 1 cm. If a sample of 10 birds is taken from this population, what is the probability that the sample mean beak length will be greater than 6 cm?

Correct A. 0.05

B. 0.10

C. 0.20

D. 0.30

Correct Answer: A

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Question 19

A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the primary function of the xylem tissue?

Correct A. Transport of water and minerals from the roots to the leaves

B. Transport of sugars and other organic compounds from the leaves to the rest of the plant

C. Support and structure for the plant

D. Storage of nutrients and water

Correct Answer: A

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Question 20

A diagram of the human digestive system is shown below. What is the primary function of the pancreas?

Correct A. Production of digestive enzymes

B. Absorption of nutrients

C. Storage of nutrients and water

D. Regulation of blood sugar levels

Correct Answer: A

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Question 21

In the context of osmoregulation, what is the primary function of the kidneys in maintaining electrolyte balance?

A. To regulate the amount of water in the body

Correct B. To maintain the balance of electrolytes in the body

C. To regulate blood pressure

D. To remove waste products from the body

Correct Answer: B

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Question 22

Which of the following types of tissue is responsible for the production of hormones in the \endocrine system?

A. Connective tissue

Correct B. Epithelial tissue

C. Muscle tissue

D. Nervous tissue

Correct Answer: B

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Question 23

In the context of evolutionary theory, what is the term for the process by which a species becomes better adapted to its environment?

Correct A. Natural selection

B. Genetic drift

C. Mutation

D. Gene flow

Correct Answer: A

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Question 24

Which of the following microorganisms is responsible for the production of botulism toxin?

A. Bacillus cereus

Correct B. Clostridium botulinum

C. Escherichia coli

D. Staphylococcus aureus

Correct Answer: B

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Question 25

In the context of nervous system coordination, what is the term for the process by which the nervous system integrates and interprets sensory information?

Correct A. Sensory integration

B. Motor control

C. Cognitive proces\sing

D. Emotional regulation

Correct Answer: A

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