Practice Post UTME UNILORIN biology 2017 Past Questions

Question 1

In the context of eco\logy, what is the primary function of a keystone species?

A. To regulate the population of other species

B. To provide a source of food for other species

C. To create a habitat for other species

Correct D. To maintain the balance of the e\cosystem

Correct Answer: D

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Question 2

A patient has been diagnosed with a bacterial infection. Which of the following antibiotics would be most effective against this type of infection?

A. Penicillin

B. Erythromycin

C. Ciprofloxacin

Correct D. Vancomycin

Correct Answer: D

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Question 3

In the human body, what is the primary function of the kidneys?

Correct A. To filter waste products from the blood

B. To regulate the balance of fluids in the body

C. To produce hormones that stimulate the growth of red blood cells

D. To maintain the pH balance of the body

Correct Answer: A

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Question 4

A diagram of the human eye is shown below. What is the primary function of the lens?

Correct A. To focus light on the retina

B. To regulate the amount of light that enters the eye

C. To produce tears that lubricate the eye

D. To maintain the shape of the eye

Correct Answer: A

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Question 5

In the context of eco\logy, what is the term for the process by which plants convert sunlight into energy?

Correct A. Photosynthesis

B. Respiration

C. Decomposition

D. Fermentation

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. 0.36

Correct B. 0.64

C. 0.48

D. 0.52

Correct Answer: B

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Question 7

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.25 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 0.5 m/s

Correct B. 1.25 m/s

C. 2.5 m/s

D. 5 m/s

Correct Answer: B

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Question 8

A bio\logist is studying the effect of pH on the growth of a certain microorganism. The growth rate of the microorganism is measured in terms of the rate of increase in biomass. If the growth rate is given by the equation \( \frac{dX}{dt} = k \left\( \frac{X}{K} \right \)^2 \), where X is the biomass, K is the carrying capacity, and k is a cons\tant, what is the value of k if the growth rate is 0.5 g/h and the biomass is 10 g?

Correct A. 0.01 h^{-1}

B. 0.1 h^{-1}

C. 0.5 h^{-1}

D. 1 h^{-1}

Correct Answer: A

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Question 9

A 5-liter solution contains 3 moles of glu\cose (C6H12O6) and 2 moles of fructose (C6H12O6). What is the concentration of glu\cose in the solution?

A. 0.3 M

Correct B. 0.6 M

C. 0.9 M

D. 1.2 M

Correct Answer: B

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Question 10

A 10-kg block is moving at a speed of 5 m/s on a horizontal surface. If the coefficient of kinetic friction is 0.2, what is the force of friction acting on the block?

A. 5 N

Correct B. 10 N

C. 15 N

D. 20 N

Correct Answer: B

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Question 11

In a tropical rainforest e\cosystem, the primary consumers are primarily herbivores that feed on the abundant vegetation. However, some primary consumers are known to be carnivores. What is the most likely reason for this adaptation?

A. To avoid competition with other herbivores for food resources

Correct B. To exploit a new food source and increase energy intake

C. To reduce predation pressure from carnivorous predators

D. To adapt to changing environmental conditions

Correct Answer: B

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Question 12

A species of bird has a unique mating ritual where the male bird performs a complex dance to attract a female. What is the most likely reason for this behavior?

A. To establish dominance over other males

Correct B. To demonstrate genetic fitness to potential mates

C. To signal the availability of food resources

D. To communicate with other birds in the flock

Correct Answer: B

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Question 13

A population of rabbits is growing exponentially, with a birth rate of 0.05 and a death rate of 0.01. What is the carrying capacity of the environment?

A. 100

B. 200

Correct C. 500

D. 1000

Correct Answer: C

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Question 14

A species of plant has a unique adaptation where it can change its leaf shape in response to changes in light intensity. What is the most likely reason for this adaptation?

Correct A. To optimize photosynthesis in low-light conditions

B. To reduce water loss in high-light conditions

C. To attract pollinators in high-light conditions

D. To deter herbivores in low-light conditions

Correct Answer: A

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Question 15

A species of fish has a unique mating ritual where the male fish builds a complex nest to attract a female. What is the most likely reason for this behavior?

A. To establish dominance over other males

Correct B. To demonstrate genetic fitness to potential mates

C. To signal the availability of food resources

D. To communicate with other fish in the school

Correct Answer: B

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Question 16

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?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 17

A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.15 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, what is the maximum speed of the block?

A. 0.5 m/s

B. 1.0 m/s

Correct C. 1.5 m/s

D. 2.0 m/s

Correct Answer: C

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Question 18

A solution containing 0.1 M glu\cose and 0.2 M fructose is separated by a semipermeable membrane. If the osmotic pressure of the solution is 1.5 atm, what is the concentration of the solute on the other side of the membrane?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 19

A 10 mL sample of a solution containing 0.5 M NaCl is diluted to 50 mL. What is the concentration of the solution after dilution?

A. 0.05 M

Correct B. 0.1 M

C. 0.15 M

D. 0.2 M

Correct Answer: B

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Question 20

A 2.0 L sample of a gas at 1.5 atm and 25°C is compressed to 0.5 L. What is the new pressure of the gas?

A. 3.0 atm

B. 4.0 atm

Correct C. 5.0 atm

D. 6.0 atm

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 recessive genotype 'aa'?

Correct A. 0.04

B. 0.16

C. 0.36

D. 0.64

Correct Answer: A

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Question 22

A 1.5 m long wire is connected to a 9 V battery. If the wire has a resis\tance of 0.5 Ω, what is the current flowing through the wire?

A. 6 A

Correct B. 12 A

C. 18 A

D. 24 A

Correct Answer: B

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Question 23

A plant with the genotype 'Rr' is crossed with a plant with the genotype 'RR'. What is the probability that the offspring will have the genotype 'Rr'?

A. 0.25

Correct B. 0.5

C. 0.75

D. 0.9

Correct Answer: B

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Question 24

A 2.5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.5 m from its equilibrium position, what is the potential energy stored in the spring?

A. 12.5 J

B. 25 J

Correct C. 37.5 J

D. 50 J

Correct Answer: C

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Question 25

A population of bacteria is growing exponentially with a growth rate of 0.05/h. If the initial population is 1000 bacteria, what is the population after 3 hours?

A. 1000

B. 2000

Correct C. 5000

D. 10000

Correct Answer: C

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