POST UTME CHRISTOPHER UNIVERSITY 2020 Biology | Objective

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Question 1
In a population of Drosophila melanogaster, the frequency of the recessive allele 'a' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
A. 100
B. 200
Correct C. 400
D. 800

Correct Answer: C

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Question 2
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of the gas is removed, what is the new pressure?
A. 1.5 atm
Correct B. 2.0 atm
C. 2.5 atm
D. 3.0 atm

Correct Answer: B

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Question 3
A plant with the genotype 'AaBb' is crossed with a plant with the genotype 'AaBb'. What is the probability that the offspring will have the genotype 'AABB'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 4
A 10 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 1.0 m/s
Correct B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s

Correct Answer: B

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Question 5
A 5 L flask contains 3 mol of an ideal gas at 37°C. If the gas is compressed to 2 L, what is the new temperature?
A. 27°C
B. 37°C
Correct C. 47°C
D. 57°C

Correct Answer: C

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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. 0.16
B. 0.36
Correct C. 0.64
D. 0.84

Correct Answer: C

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Question 7
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'Tt'. What is the probability that the offspring will have the genotype 'tt'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 8
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the function of the xylem tissue?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and storage
D. Protection from pathogens

Correct Answer: A

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Question 9
A diagram of the human excretory system is shown below. What is the function of the kidneys?
Correct A. Filtering waste from the blood
B. Regulating blood pressure
C. Producing hormones
D. Absorbing nutrients

Correct Answer: A

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Question 10
A diagram of the human eye is shown below. What is the function of the lens?
Correct A. B\ending light to focus on the retina
B. Regulating the amount of light entering the eye
C. Producing tears
D. Absorbing excess light

Correct Answer: A

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Question 11
In the context of asexual reproduction, what is the primary advantage of budding in yeast?
A. Increased genetic diversity
B. Efficient use of resources
Correct C. Rapid reproduction
D. Improved survival rates

Correct Answer: C

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Question 12
A patient has been diagnosed with a bacterial infection. Which of the following antibiotics would be most effective in treating the infection?
A. Penicillin
B. Erythromycin
C. Ciprofloxacin
Correct D. Vancomycin

Correct Answer: D

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Question 13
In the human body, what is the primary function of the xylem tissue in plants?
Correct A. Transport of water and minerals
B. Production of glu\cose through photosynthesis
C. Storage of nutrients and water
D. Regulation of body temperature

Correct Answer: A

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Question 14
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 produce tears for lubrication
C. To regulate body temperature
D. To detect movement

Correct Answer: A

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Question 15
A diagram of the human brain is shown below. What is the primary function of the cerebellum?
A. To regulate body temperature
B. To produce hormones
Correct C. To control movement and balance
D. To detect pain

Correct Answer: C

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Question 16
In a population of 1000 individuals, 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 genotype AA in the next generation?
Correct A. 0.36
B. 0.42
C. 0.48
D. 0.54

Correct Answer: A

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Question 17
A 2.0 M solution of HCl is mixed with a 1.0 M solution of NaOH. What is the pH of the resulting solution?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 18
A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours. What is the expected effect on the plant's growth rate?
Correct A. Increased growth rate
B. Decreased growth rate
C. No effect on growth rate
D. Variable growth rate

Correct Answer: A

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Question 19
A 50-g sample of a subs\tance is dissolved in 100 mL of water. What is the molarity of the resulting solution?
Correct A. 0.05 M
B. 0.1 M
C. 0.5 M
D. 1.0 M

Correct Answer: A

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Question 20
A 1.0 M solution of NaOH is mixed with a 2.0 M solution of HCl. What is the resulting pH?
A. 1.0
Correct B. 2.0
C. 3.0
D. 4.0

Correct Answer: B

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Question 21
In a population of Drosophila melanogaster, the frequency of the recessive allele 'b' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the frequency of the homozygous recessive genotype 'bb'?
Correct A. 0.04
B. 0.08
C. 0.12
D. 0.16

Correct Answer: A

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Question 22
A plant with the genotype 'Tt' is crossed with a plant with the genotype 'tt'. What is the probability that the offspring will have the genotype 'TT'?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 23
A diagram of the xylem and phloem tissues in a plant stem is shown below. What is the function of the xylem tissue?
Correct A. Transport of water and minerals
B. Transport of sugars and amino acids
C. Support and storage
D. Protection from pathogens

Correct Answer: A

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Question 24
A diagram of the human circulatory system is shown below. What is the function of the pulmonary veins?
Correct A. Transport of oxygenated blood from the lungs to the heart
B. Transport of deoxygenated blood from the heart to the lungs
C. Transport of nutrients from the digestive system to the cells
D. Transport of waste products from the cells to the kidneys

Correct Answer: A

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Question 25
A diagram of the human digestive system is shown below. What is the function of the pancreas?
A. Production of bile to aid in fat digestion
Correct B. Production of digestive enzymes to aid in protein digestion
C. Production of hormones to regulate blood sugar levels
D. Production of mucus to aid in the movement of food through the digestive system

Correct Answer: B

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