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POST UTME UNN 2024 Biology | Objective

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Question 1

In a population of 1000 individuals, 20% are homozygous dominant (BB), 40% are heterozygous (Bb), and 40% are homozygous recessive (bb). What is the frequency of the recessive allele (b)?

A. 0.2

B. 0.4

Correct C. 0.6

D. 0.8

Correct Answer: C

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Question 2

A diagram of the human brain is shown below. Which part of the brain is responsible for regulating body temperature?

Correct A. Hypothalamus

B. Cerebellum

C. Pons

D. Medulla Oblongata

Correct Answer: A

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Question 3

In a study on the effects of light intensity on plant growth, the following data were collected:

Correct A. y = 2x + 1

B. y = 3x - 2

C. y = 4x + 3

D. y = 5x - 4

Correct Answer: A

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Question 4

A diagram of the human digestive system is shown below. Which part of the digestive system is responsible for absorbing nutrients from food?

Correct A. Small intestine

B. Large intestine

C. Stomach

D. Liver

Correct Answer: A

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Question 5

A diagram of the human excretory system is shown below. Which part of the excretory system is responsible for removing waste from the body?

Correct A. Kidneys

B. Liver

C. Lungs

D. Skin

Correct Answer: A

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Question 6

The diagram below represents a cross-section of the human eye. Identify the structure labeled 'A' that is responsible for detecting light and color.

A. Cornea

B. Iris

Correct C. Retina

D. Optic Nerve

Correct Answer: C

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Question 7

A population of bacteria is growing exponentially according to the equation ( N(t) = N_0 e^{kt} ), where \( N_0 \) is the initial population, ( k ) is the growth rate, and ( t ) is time in hours. If the population doubles every 2 hours, what is the value of ( k )?

A. 0.173

B. 0.346

Correct C. 0.693

D. 1.386

Correct Answer: C

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Question 8

In a genetic cross, a tall plant (TT) is crossed with a short plant (tt). What is the probability that the offspring will be tall?

A. 0.25

Correct B. 0.5

C. 0.75

D. 1.0

Correct Answer: B

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Question 9

The diagram below represents a simple 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 A to B to C

B. From C to B to A

C. From B to A to C

D. From C to A to B

Correct Answer: A

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Question 10

A plant has a genotype of Rr for a certain trait. What is the probability that the offspring will be homozygous dominant (RR) if crossed with a plant that is homozygous recessive (rr)?

A. 0.25

Correct B. 0.5

C. 0.75

D. 1.0

Correct Answer: B

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Question 11

In a population of 1000 individuals, 70% have the dominant allele for brown eye color (B) and 30% have the recessive allele (b). If two individuals are randomly selected, what is the probability that they will both have brown eye color?

Correct A. 0.49

B. 0.51

C. 0.67

D. 0.75

Correct Answer: A

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Question 12

A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of E. coli at different pH levels and plots the data on a graph. Which of the following best describes the relationship between pH and growth rate?

A. Directly proportional

Correct B. Inversely proportional

C. No relationship

D. U-shaped curve

Correct Answer: B

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Question 13

A plant has a genotype of BB and a phenotype of red flowers. If the plant is crossed with a plant having the genotype of bb and the phenotype of white flowers, what is the probability that the offspring will have red flowers?

Correct A. 0.5

B. 0.75

C. 0.25

D. 0.0

Correct Answer: A

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Question 14

A researcher is studying the effect of temperature on the rate of photosynthesis in plants. The researcher measures the rate of photosynthesis at different temperatures and plots the data on a graph. Which of the following best describes the relationship between temperature and rate of photosynthesis?

Correct A. Directly proportional

B. Inversely proportional

C. No relationship

D. U-shaped curve

Correct Answer: A

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Question 15

A population of 1000 individuals has a mean height of 170 cm and a s\tandard deviation of 10 cm. If a random sample of 50 individuals is taken from this population, what is the probability that the sample mean will be greater than 175 cm?

Correct A. 0.05

B. 0.01

C. 0.005

D. 0.0005

Correct Answer: A

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Question 16

In a tropical rainforest e\cosystem, the primary producers are plants that undergo photosynthesis. What is the net result of photosynthesis in terms of oxygen and glu\cose production?

Correct A. Glu\cose and oxygen are produced in equal amounts

B. Glu\cose is produced, but oxygen is consumed

C. Oxygen is produced, but glu\cose is consumed

D. Glu\cose and oxygen are consumed in equal amounts

Correct Answer: A

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Question 17

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

A. 1000

B. 2000

C. 4000

Correct D. 8000

Correct Answer: D

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Question 18

A diagram shows a cross-section of a plant root. Which of the following structures is responsible for the absorption of water and minerals from the soil?

A. A

Correct B. B

C. C

D. Both A and B

Correct Answer: B

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Question 19

A diagram shows a simple circuit with a battery, a resistor, and a light bulb. If the battery has a voltage of 9V and the resistor has a resis\tance of 10Ω, what is the current flowing through the circuit?

A. 0.9A

Correct B. 1.0A

C. 1.1A

D. 1.2A

Correct Answer: B

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Question 20

A diagram shows a cross-section of a human heart. Which of the following structures is responsible for the regulation of blood pressure?

A. A

B. B

Correct C. C

D. Both A and B

Correct Answer: C

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Question 21

A study on the genetic variation of a population found that the frequency of the dominant allele (A) is 0.6, and the frequency of the recessive allele (a) is 0.4. What is the expected frequency of the heterozygous genotype (Aa) in the population?

A. 0.24

Correct B. 0.36

C. 0.48

D. 0.60

Correct Answer: B

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Question 22

A plant has a photosynthetic rate of 10 μmol CO2 s-1. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?

A. 20 μmol CO2 s-1

Correct B. 40 μmol CO2 s-1

C. 60 μmol CO2 s-1

D. 80 μmol CO2 s-1

Correct Answer: B

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Question 23

A neuron has a resting membrane potential of -70 mV. If the membrane potential is depolarized by 10 mV, what is the new membrane potential?

Correct A. -60 mV

B. -50 mV

C. -40 mV

D. -30 mV

Correct Answer: A

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Question 24

A population of bacteria has a growth rate of 0.5 h-1. If the initial population size is 100 cells, what is the population size after 2 hours?

A. 200 cells

B. 400 cells

Correct C. 600 cells

D. 800 cells

Correct Answer: C

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Question 25

A plant has a stomatal density of 100 stomata cm-2. If the stomatal index is 0.5, what is the total leaf area?

A. 200 cm2

Correct B. 400 cm2

C. 600 cm2

D. 800 cm2

Correct Answer: B

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