Practice Post UTME LASU 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

A diagram of the human respiratory system is shown below. Identify the structure labeled 'X'.

Correct A. Bronchus

B. Trachea

C. Diaphragm

D. Pleura

Correct Answer: A

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Question 3

The graph below shows the relationship between the concentration of a substrate and the rate of enzyme activity. What is the name of the enzyme?

A. Amylase

B. Lactase

Correct C. Tryp\sin

D. None of the above

Correct Answer: C

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Question 4

A population of E. coli is growing in a nutrient-rich environment. If the initial population size is 100 cells and the growth rate is 0.5 h^-1, what is the population size after 2 hours?

A. 100

B. 150

Correct C. 200

D. 250

Correct Answer: C

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Question 5

A diagram of the human eye is shown below. Identify the structure labeled 'Y'.

Correct A. Retina

B. Iris

C. Lens

D. None of the above

Correct Answer: A

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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. 0.2

B. 0.4

C. 0.6

Correct D. 0.8

Correct Answer: D

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Question 7

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?

Correct A. 101325 Pa

B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: A

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Question 8

A plant grows in a soil with a pH of 6.5. If the plant requires a pH of 5.5 to grow optimally, what is the direction of the pH gradient?

A. From A to B

Correct B. From B to A

C. No gradient

D. Unknown

Correct Answer: B

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Question 9

A 10% solution of glu\cose in water is diluted to 5%. What is the ratio of the initial volume to the final volume?

A. 2:1

Correct B. 1:2

C. 1:1

D. 2:3

Correct Answer: B

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Question 10

A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. What is the pressure of the gas?

Correct A. 101325 Pa

B. 202650 Pa

C. 303875 Pa

D. 405100 Pa

Correct Answer: A

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Question 11

In a terrestrial e\cosystem, what is the primary role of decomposers in the nutrient cycle?

A. To break down organic matter into simpler compounds

B. To synthesize complex organic molecules from inorganic compounds

C. To absorb and store nutrients for future use

Correct D. To release nutrients back into the environment

Correct Answer: D

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Question 12

A researcher is studying the behavior of a specific species of bird in a forest e\cosystem. Which of the following is an example of a habitat modification that could affect the bird's behavior?

A. The presence of a nearby stream

Correct B. The density of tree cover

C. The availability of food sources

D. The presence of a predator

Correct Answer: B

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Question 13

In a human eye, what is the primary function of the lens?

Correct A. To focus light onto the retina

B. To regulate the amount of light entering the eye

C. To detect changes in color

D. To produce tears

Correct Answer: A

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Question 14

A plant is undergoing photosynthesis in a controlled environment. What is the primary role of the stomata in this process?

A. To release oxygen into the atmosphere

Correct B. To absorb carbon dioxide from the atmosphere

C. To release water vapor into the atmosphere

D. To regulate the amount of light entering the plant

Correct Answer: B

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Question 15

A researcher is studying the nervous system of a specific species of animal. Which of the following is an example of a synapse?

Correct A. The connection between two neurons

B. The release of neurotransmitters

C. The reception of signals by a neuron

D. The transmission of signals along a neuron

Correct Answer: A

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Question 16

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

B. No mutation

Correct C. No gene flow

D. No natural selection

Correct Answer: C

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Question 17

In a tropical rainforest, the average temperature is 25°C, and the relative humidity is 80%. What is the approximate vapor pressure of the air?

A. 20 kPa

Correct B. 25 kPa

C. 30 kPa

D. 35 kPa

Correct Answer: B

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Question 18

A plant grows in a pot with a mixture of soil and sand. The plant's roots absorb water and nutrients from the soil, but the sand prevents the soil from becoming too dense. What is the name of this type of soil?

A. Loam

Correct B. Sandy loam

C. Clay loam

D. Silt loam

Correct Answer: B

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Question 19

The human eye has a blind spot located in the center of the visual field. What is the name of the nerve that is responsible for transmitting visual information from the retina to the brain?

Correct A. Optic nerve

B. Olfactory nerve

C. Auditory nerve

D. Trigeminal nerve

Correct Answer: A

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Question 20

The hypothalamus is a region of the brain that regulates body temperature, hunger, and thirst. What is the name of the hormone that is released by the hypothalamus to stimulate appetite?

A. Insulin

B. Glucagon

Correct C. Ghrelin

D. Leptin

Correct Answer: C

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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?

Correct A. 0.36

B. 0.64

C. 0.16

D. 0.84

Correct Answer: A

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Question 22

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 this cell will enter next?

A. G1

B. S

C. G2

Correct D. M

Correct Answer: D

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Question 23

A person has a blood type of AB and a Rh factor of positive. What is the genotype of this person?

Correct A. I^A I^A i i

B. I^A i I^B i

C. I^A I^A I^B I^B

D. i i I^A I^A

Correct Answer: A

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Question 24

A diagram of the human eye is shown below. What is the function of the part labeled 'A'?

Correct A. To focus light on the retina

B. To detect movement

C. To regulate pupil size

D. To produce tears

Correct Answer: A

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Question 25

A person has a blood pressure of 120/80 mmHg. What is the diastolic pressure?

A. 80

Correct B. 90

C. 100

D. 110

Correct Answer: B

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