POST UTME BOWEN UNIVERSITY 2017 Biology | Objective

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Question 1 View Details
The Hardy-Weinberg principle states that the frequency of alleles in a population will remain cons\tant from generation to generation if five conditions are met. Which of the following is NOT one of the conditions?
Correct A. Large population size
B. No mutation
C. No gene flow
D. Random mating

Correct Answer: A

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Question 2 View Details
In a freshwater e\cosystem, the primary producers are typically what type of organisms?
A. Herbivores
B. Decomposers
Correct C. Phytoplankton
D. Zooplankton

Correct Answer: C

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Question 3 View Details
The process by which an organism's genetic information is passed from one generation to the next is called what?
A. Mutation
B. Gene expression
C. Genetic drift
Correct D. Heritability

Correct Answer: D

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Question 4 View Details
In a typical e\cosystem, what is the role of decomposers?
A. Primary producers
B. Consumers
Correct C. Decomposers
D. Scavengers

Correct Answer: C

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Question 5 View Details
The process by which an organism's genetic information is altered by external factors is called what?
Correct A. Mutation
B. Gene expression
C. Genetic drift
D. Epigenetics

Correct Answer: A

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Question 6 View Details
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?
Correct A. 200
B. 400
C. 600
D. 800

Correct Answer: A

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Question 7 View Details
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If 1.5 mol of the gas is added to the flask, what is the new pressure?
A. 1.5 atm
Correct B. 2.5 atm
C. 3.5 atm
D. 4.5 atm

Correct Answer: B

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Question 8 View Details
In a study on the effect of pH on enzyme activity, the following data were collected:
A. pH 7
Correct B. pH 9
C. pH 11
D. pH 13

Correct Answer: B

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Question 9 View Details
A 10% solution of glu\cose is diluted to 5% by adding water. What is the ratio of the initial volume to the final volume?
A. 1:2
Correct B. 1:3
C. 2:3
D. 3:4

Correct Answer: B

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Question 10 View Details
A 2.5 L flask contains 0.5 mol of an ideal gas at 27°C. If the gas is heated to 37°C, what is the new volume?
A. 2.5 L
Correct B. 3.5 L
C. 4.5 L
D. 5.5 L

Correct Answer: B

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Question 11 View Details
In a population of 1000 individuals, 200 are infected with a disease that has a 20% mortality rate. What is the expected number of deaths due to this disease?
A. 30
Correct B. 40
C. 50
D. 60

Correct Answer: B

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Question 12 View Details
A 5-year-old child is diagnosed with a rare genetic disorder that affects the production of a crucial enzyme. Which of the following is a likely consequence of this disorder?
A. Impaired vision
Correct B. Severe muscle weakness
C. Abnormal skin pigmentation
D. Respiratory failure

Correct Answer: B

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Question 13 View Details
A researcher is studying the effects of pollution on a local e\cosystem. Which of the following is a likely consequence of pollution on the e\cosystem?
Correct A. Decreased biodiversity
B. Increased population growth
C. Improved water quality
D. Enhanced soil fertility

Correct Answer: A

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Question 14 View Details
A patient is diagnosed with a bacterial infection that requires antibiotic treatment. Which of the following antibiotics is most likely to be effective against this infection?
A. Penicillin
B. Erythromycin
Correct C. Ciprofloxacin
D. Vancomycin

Correct Answer: C

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Question 15 View Details
A 30-year-old woman is experiencing symptoms of menopause, including hot flashes and vaginal dryness. Which of the following is a likely cause of these symptoms?
Correct A. Hormonal imbalance
B. Genetic predisposition
C. Environmental factors
D. Lifestyle choices

Correct Answer: A

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Question 16 View Details
In a tropical rainforest, the primary consumers are primarily herbivores that feed on the abundant plant life. Which of the following is a characteristic of these primary consumers?
A. They have a high metabolic rate
B. They have a low reproductive rate
C. They have a large body size
Correct D. They have a specialized digestive system

Correct Answer: D

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Question 17 View Details
A plant cell has a large central vacuole that contains a high concentration of solutes. What is the primary function of this vacuole?
Correct A. To maintain cell turgor pressure
B. To store excess water
C. To regulate cell pH
D. To synthesize proteins

Correct Answer: A

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Question 18 View Details
A diagram of a plant's xylem and phloem is shown below. What is the primary function of the xylem?
Correct A. To transport water and minerals
B. To transport sugars and amino acids
C. To regulate cell pH
D. To synthesize proteins

Correct Answer: A

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Question 19 View Details
A diagram of a human eye is shown below. What is the primary function of the retina?
A. To focus light on the retina
Correct B. To detect light and transmit signals to the brain
C. To regulate pupil size
D. To synthesize proteins

Correct Answer: B

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Question 20 View Details
A diagram of a human brain is shown below. What is the primary function of the cerebral cortex?
A. To regulate body temperature
B. To control voluntary movements
Correct C. To process sensory information
D. To synthesize proteins

Correct Answer: C

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Question 21 View Details
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. 0.64
B. 0.36
C. 0.16
D. 0.84

Correct Answer: A

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Question 22 View Details
A 2.5 L flask contains 0.5 M NaOH. If 25 mL of 1.5 M HCl is slowly added to the flask, what is the resulting concentration of the solution?
A. 0.6 M
Correct B. 0.8 M
C. 1.0 M
D. 1.2 M

Correct Answer: B

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Question 23 View Details
A plant grows in a pot with a mixture of 70% sand and 30% clay. If the plant absorbs 100 mL of water, what is the amount of water absorbed by the sand?
Correct A. 60 mL
B. 70 mL
C. 80 mL
D. 90 mL

Correct Answer: A

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Question 24 View Details
A 50 g sample of a mixture of NaCl and KCl is dissolved in 100 mL of water. If the solution has a conductivity of 0.5 S/m, what is the molar concentration 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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Question 25 View Details
A 10 mL sample of a solution containing 0.5 M glu\cose is added to a 90 mL sample of 0.2 M glu\cose. What is the resulting concentration of the solution?
A. 0.3 M
B. 0.4 M
Correct C. 0.5 M
D. 0.6 M

Correct Answer: C

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