POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2025 Biology | Objective

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Question 1 View Details
In a closed system, what is the net effect of cellular respiration on the concentration of ATP?
A. Increases ATP concentration
Correct B. Decreases ATP concentration
C. Has no effect on ATP concentration
D. Increases ATP concentration, but only in the mitochondria

Correct Answer: B

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Question 2 View Details
A plant cell is placed in a solution with a high concentration of glu\cose. What is the expected outcome?
A. The plant cell will undergo mitosis
B. The plant cell will undergo meiosis
Correct C. The plant cell will produce more ATP
D. The plant cell will produce more glu\cose

Correct Answer: C

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Question 3 View Details
A diagram of a plant root system is shown below. What is the function of the xylem in this system?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport glu\cose from the leaves to the roots
C. To produce ATP in the mitochondria
D. To synthesize proteins in the ribosomes

Correct Answer: A

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Question 4 View Details
A diagram of a human circulatory system is shown below. What is the function of the heart in this system?
A. To pump blood from the heart to the lungs
Correct B. To pump blood from the heart to the rest of the body
C. To filter waste products from the blood
D. To regulate body temperature

Correct Answer: B

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Question 5 View Details
A diagram of a human digestive system is shown below. What is the function of the pancreas in this system?
Correct A. To produce digestive enzymes
B. To absorb nutrients from the small intestine
C. To regulate blood sugar levels
D. To produce hormones that stimulate digestion

Correct Answer: A

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Question 6 View Details
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. 0.16
C. 0.36
D. 0.64

Correct Answer: A

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Question 7 View Details
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 0.5 mol of the gas is removed, what is the new pressure of the gas?
A. 2.5 atm
Correct B. 3.5 atm
C. 4.5 atm
D. 5.5 atm

Correct Answer: B

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Question 8 View Details
A plant grows in a nutrient-poor soil. Which of the following is a likely adaptation of the plant?
Correct A. Deep roots to access water and nutrients
B. Large leaves to increase photosynthesis
C. Small leaves to reduce transpiration
D. Thorns to protect from herbivores

Correct Answer: A

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Question 9 View Details
A 50-year-old man has a family history of prostate cancer. His prostate-specific antigen (PSA) level is 10 ng/mL. What is the most likely diagnosis?
A. Benign prostatic hyperplasia
Correct B. Prostate cancer
C. Prostatitis
D. Prostatic calculi

Correct Answer: B

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Question 10 View Details
A 25-year-old woman has a history of recurrent urinary tract infections (UTIs). She has a family history of kidney stones. What is the most likely diagnosis?
A. Urinary tract infection
Correct B. Kidney stone
C. Bladder cancer
D. Urethral stricture

Correct Answer: B

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Question 11 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. 0.24

Correct Answer: A

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Question 12 View Details
A plant cell has a vacuole that contains 0.5 M sucrose. If the cell membrane is permeable to sucrose, what is the concentration of sucrose in the cytosol after 30 minutes?
Correct A. 0.25 M
B. 0.5 M
C. 0.75 M
D. 1.0 M

Correct Answer: A

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Question 13 View Details
A diagram of a plant root system is shown below. Identify the part labeled 'A'.
Correct A. Root hair
B. Stem
C. Leaf
D. Xylem

Correct Answer: A

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Question 14 View Details
A population of bacteria is growing exponentially. If the initial population size is 100 and the growth rate is 0.2 per hour, what is the population size after 2 hours?
A. 200
Correct B. 400
C. 600
D. 800

Correct Answer: B

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Question 15 View Details
A diagram of a cell membrane is shown below. Identify the part labeled 'B'.
A. Phospholipid
Correct B. Protein
C. Cell membrane
D. Cholesterol

Correct Answer: B

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Question 16 View Details
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Reabsorption of ions in the proximal convoluted tubule
B. Secretion of ions in the distal convoluted tubule
C. Regulation of ion channels in the collecting duct
D. Excretion of ions in the urine

Correct Answer: A

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Question 17 View Details
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 18 View Details
In the xylem, what is the primary mechanism by which water and minerals are transported from the roots to the leaves?
Correct A. Transpiration pull
B. Root pressure
C. Capillary action
D. Osmosis

Correct Answer: A

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Question 19 View Details
What is the term for the process by which an organism's genetic information is altered by external factors?
Correct A. Mutation
B. Genetic drift
C. Gene flow
D. Epigenetics

Correct Answer: A

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Question 20 View Details
In the process of reproduction, what is the term for the fusion of male and female gametes to form a zygote?
Correct A. Fertilization
B. Meiosis
C. Mitosis
D. Syngamy

Correct Answer: A

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Question 21 View Details
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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Question 22 View Details
In the process of osmoregulation, what is the primary mechanism by which the kidneys regulate the concentration of ions in the blood?
Correct A. Reabsorption of ions in the proximal convoluted tubule
B. Secretion of ions in the distal convoluted tubule
C. Regulation of ion channels in the collecting duct
D. Excretion of ions in the urine

Correct Answer: A

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Question 23 View Details
What is the term for the process by which an organism's genetic information is altered by external factors?
Correct A. Mutation
B. Genetic drift
C. Gene flow
D. Epigenetics

Correct Answer: A

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Question 24 View Details
In the process of reproduction, what is the term for the fusion of male and female gametes to form a zygote?
Correct A. Fertilization
B. Meiosis
C. Mitosis
D. Syngamy

Correct Answer: A

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Question 25 View Details
What is the term for the process by which an organism's genetic information is passed from one generation to the next?
A. Mutation
B. Genetic drift
C. Gene flow
Correct D. Heritability

Correct Answer: D

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