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POST UTME LASU 2018 Biology | Objective

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Question 1

In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous dominant genotype?

Correct A. 0.36

B. 0.64

C. 0.72

D. 0.84

Correct Answer: A

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Question 2

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

A. Mitochondria

B. Chloroplast

Correct C. Nucleus

D. Vacuole

Correct Answer: C

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Question 3

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

A. 0.06 M

Correct B. 0.075 M

C. 0.1 M

D. 0.15 M

Correct Answer: B

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Question 4

A diagram of a human eye is shown below. Identify the part labeled 'B'.

A. Cornea

Correct B. Iris

C. Retina

D. Lens

Correct Answer: B

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Question 5

A 5.0 g sample of a compound is found to have a mass of 2.5 g after being dried in an oven at 105°C for 30 minutes. What is the percentage of water in the compound?

A. 10%

Correct B. 20%

C. 30%

D. 40%

Correct Answer: B

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Question 6

The Hardy-Weinberg principle states that allele and genotype frequencies in a population will remain cons\tant from generation to generation in the absence of other evolutionary influences. Which of the following is a necessary condition for the Hardy-Weinberg principle to hold?

A. Random mating

Correct B. No mutation

C. No gene flow

D. No genetic drift

Correct Answer: B

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Question 7

In the process of cellular respiration, which of the following is the primary source of energy for the cell?

Correct A. Glu\cose

B. ATP

C. NADH

D. FADH2

Correct Answer: A

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Question 8

The nervous system is responsible for transmitting signals from one part of the body to another. Which of the following types of fibers is responsible for transmitting sensory information?

A. A-\alpha

B. A-\beta

C. A-\gamma

Correct D. A-delta

Correct Answer: D

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Question 9

The process of meiosis results in the production of gametes with half the number of chromosomes as the parent cell. Which of the following is a result of meiosis?

Correct A. Increased genetic variation

B. Decreased genetic variation

C. No change in genetic variation

D. Increased genetic drift

Correct Answer: A

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Question 10

The hormone insulin is produced by the pancreas and plays a crucial role in regulating blood sugar levels. Which of the following is a function of insulin?

A. Increa\sing blood glu\cose levels

Correct B. Decrea\sing blood glu\cose levels

C. Regulating protein synthesis

D. Regulating lipid metabolism

Correct Answer: B

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Question 11

A population of Drosophila melanogaster is maintained in a laboratory. The population size is 1000 individuals, and the sex ratio is 1:1. The average lifespan of the flies is 30 days. If the population is allowed to grow exponentially, what is the carrying capacity of the population?

A. 1000

B. 5000

Correct C. 10000

D. 20000

Correct Answer: C

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Question 12

A 2.5 L solution of 0.1 M glu\cose is prepared. What is the mass of glu\cose in the solution?

Correct A. 62.5 g

B. 125 g

C. 250 g

D. 500 g

Correct Answer: A

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Question 13

A diagram of the human respiratory system is shown below. What is the function of the alveoli?

Correct A. Exchange of oxygen and carbon dioxide

B. Filtering of dust particles

C. Production of mucus

D. Regulation of body temperature

Correct Answer: A

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Question 14

A 5.0 L solution of 0.2 M NaCl is prepared. What is the concentration of Na+ ions in the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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Question 15

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

A. Production of bile

Correct B. Production of digestive enzymes

C. Absorption of nutrients

D. Storage of waste products

Correct Answer: B

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Question 16

In a closed e\cosystem, the rate of respiration in a population of organisms is directly proportional to the square root of the population size. If the population size doubles, what is the new rate of respiration?

A. Increases by a factor of 2

Correct B. Increases by a factor of 4

C. Increases by a factor of 8

D. Remains the same

Correct Answer: B

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Question 17

A researcher is studying the effect of pH on the growth of a microorganism. The growth rate is measured in terms of the rate of increase in cell density. If the pH of the medium is increased by 1 unit, what is the new growth rate?

A. Increases by a factor of 2

B. Increases by a factor of 4

C. Increases by a factor of 8

Correct D. Remains the same

Correct Answer: D

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Question 18

A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is permeable to glu\cose, what is the equilibrium concentration of glu\cose inside the cell?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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Question 19

A population of rabbits is growing exponentially. If the initial population size is 100 and the growth rate is 20% per year, what is the population size after 5 years?

A. 1000

B. 2000

Correct C. 4000

D. 8000

Correct Answer: C

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Question 20

A plant is placed in a solution with a concentration of 0.1 M salt. If the plant is permeable to salt, what is the equilibrium concentration of salt inside the plant?

A. 0.05 M

Correct B. 0.1 M

C. 0.2 M

D. 0.5 M

Correct Answer: B

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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'?

A. 0.2

B. 0.4

Correct C. 0.6

D. 0.8

Correct Answer: C

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Question 22

A 2.5-liter solution of 0.1 M NaCl is diluted by adding 2.5 liters of water. What is the new concentration of NaCl in the solution?

A. 0.02 M

Correct B. 0.04 M

C. 0.06 M

D. 0.08 M

Correct Answer: B

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Question 23

In a study on the effect of light on plant growth, the following data were collected: Light (hours) | Growth (cm) 0 | 2 4 | 4 8 | 6 12 | 8. What is the rate of growth per hour of light?

A. 0.5 cm/h

Correct B. 1 cm/h

C. 1.5 cm/h

D. 2 cm/h

Correct Answer: B

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Question 24

A 5-kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 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 25

A 0.5 M solution of glu\cose (C6H12O6) is prepared by dissolving 18 g of glu\cose in 100 mL of water. What is the molarity of the solution?

A. 0.1 M

Correct B. 0.2 M

C. 0.3 M

D. 0.4 M

Correct Answer: B

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