POST UTME DELSU 2017 Biology | Objective

Are you preparing for POST UTME DELSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2017 Biology (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
In the context of evolutionary bio\logy, what is the primary mechanism by which species adapt to their environment?
Correct A. Natural Selection
B. Genetic Drift
C. Gene Flow
D. Mutation

Correct Answer: A

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Question 2
A diagram of the human eye is shown below. What is the function of the part labeled 'A'?
Correct A. To focus light on the retina
B. To detect movement
C. To regulate pupil size
D. To produce tears

Correct Answer: A

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Question 3
A plant has a root system that is adapted to absorb water from a dry soil. What is the name of this adaptation?
A. Taproot
B. Fibrous root
Correct C. Adventitious root
D. Mycoheterotrophy

Correct Answer: C

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Question 4
A diagram of the human circulatory system is shown below. What is the function of the part labeled 'A'?
A. To pump blood to the lungs
Correct B. To pump blood to the body
C. To regulate blood pressure
D. To produce blood cells

Correct Answer: B

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Question 5
A diagram of the human brain is shown below. What is the function of the part labeled 'A'?
Correct A. To process sensory information
B. To regulate body temperature
C. To produce hormones
D. To control movement

Correct Answer: A

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Question 6
In a population of 1000 individuals, 70% are heterozygous for the gene controlling the production of the enzyme lactase. If 20% of the population is homozygous recessive for this gene, what is the frequency of the recessive allele?
A. 0.2
Correct B. 0.3
C. 0.4
D. 0.5

Correct Answer: B

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Question 7
A researcher is studying the effect of pH on the growth of E. coli. The researcher measures the growth rate of the bacteria at different pH levels and plots the data on a graph. If the graph shows a sigmoidal curve, what type of growth is the bacteria exhibiting?
Correct A. Logistic growth
B. Exponential growth
C. Linear growth
D. No growth

Correct Answer: A

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Question 8
A patient is diagnosed with a disease caused by a virus that has a mutation in its genome. The mutation results in the production of a non-functional protein. Which of the following is a possible consequence of this mutation?
A. The virus becomes more virulent
Correct B. The virus becomes less virulent
C. The virus becomes resis\tant to antiviral drugs
D. The virus becomes more contagious

Correct Answer: B

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Question 9
A researcher is studying the effect of temperature on the rate of a chemical reaction. The researcher measures the rate of the reaction at different temperatures and plots the data on a graph. If the graph shows a straight line, what type of reaction is the researcher studying?
A. Exothermic reaction
Correct B. Endothermic reaction
C. Neutral reaction
D. No reaction

Correct Answer: B

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Question 10
A patient is diagnosed with a disease caused by a bacterium that has developed resis\tance to antibiotics. Which of the following is a possible consequence of this resis\tance?
A. The bacterium becomes more virulent
B. The bacterium becomes less virulent
Correct C. The bacterium becomes resis\tant to other antibiotics
D. The bacterium becomes more contagious

Correct Answer: C

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Question 11
In a population of 1000 individuals, 80% are homozygous dominant (BB), 15% are heterozygous (Bb), and 5% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have offspring with the BB genotype?
A. 0.25
Correct B. 0.5
C. 0.75
D. 0.9

Correct Answer: B

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Question 12
A plant grows in a nutrient-poor soil. Which of the following is a likely adaptation of the plant?
A. Deep roots to access water deep in the soil
B. Large leaves to maximize photosynthesis
Correct C. Small leaves to minimize water loss
D. Thick stems to store water

Correct Answer: C

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Question 13
A 2-year-old child is brought to the doctor with a history of frequent urination and thirst. The doctor suspects diabetes insipidus. Which of the following is a likely cause of this condition?
A. Lack of insulin
Correct B. Lack of antidiuretic hormone (ADH)
C. Kidney damage
D. Diabetes mellitus

Correct Answer: B

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Question 14
A population of 1000 individuals is divided into 10 groups of 100 individuals each. Each group has a different allele frequency for a particular gene. Which of the following is a likely outcome of this situation?
A. The population will become more homogeneous
Correct B. The population will become more heterogeneous
C. The population will remain the same
D. The population will become extinct

Correct Answer: B

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Question 15
A 30-year-old woman is brought to the doctor with a history of irregular periods and infertility. The doctor suspects polycystic ovary syndrome (PCOS). Which of the following is a likely characteristic of this condition?
A. High levels of estrogen
B. High levels of progesterone
Correct C. High levels of androgens
D. Low levels of insulin

Correct Answer: C

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Question 16
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. 0.04

Correct Answer: A

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Question 17
The diagram below shows the structure of a mitochondrion. Which of the following is NOT a function of the cristae?
A. Protein synthesis
B. Electron transport
C. ATP synthesis
Correct D. Cell signaling

Correct Answer: D

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Question 18
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. 0.5
Correct B. 0.25
C. 0.75
D. 0.33

Correct Answer: B

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Question 19
The diagram below shows the structure of a neuron. Which of the following is the function of the d\endrites?
A. To transmit signals to other neurons
Correct B. To receive signals from other neurons
C. To synthesize neurotransmitters
D. To store genetic information

Correct Answer: B

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Question 20
A solution of 0.1 M NaCl is diluted to 0.01 M. What is the new concentration of Na+ ions?
Correct A. 0.01 M
B. 0.1 M
C. 0.05 M
D. 0.005 M

Correct Answer: A

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Question 21
In a population of 1000 individuals, 80% are heterozygous for the gene controlling the flower color, while 20% are homozygous recessive. If 10% of the heterozygous individuals and 5% of the homozygous recessive individuals are expected to be affected by a disease, what is the expected frequency of the disease in the population?
Correct A. 0.12
B. 0.15
C. 0.18
D. 0.20

Correct Answer: A

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Question 22
A cell in the G2 phase of the cell cycle has a DNA content of 8C. If the cell proceeds to mitosis, what will be the DNA content of the daughter cells?
A. 4C
B. 8C
Correct C. 16C
D. 32C

Correct Answer: C

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Question 23
A 2-year-old child is diagnosed with a rare genetic disorder that affects the production of a specific enzyme. The child's parents are both carriers of the recessive allele. What is the probability that their next child will be affected by the disorder?
A. 0.25
Correct B. 0.50
C. 0.75
D. 0.90

Correct Answer: B

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Question 24
A researcher is studying the effect of a new pesticide on a population of insects. The pesticide kills 20% of the insects in the first week, 30% in the second week, and 40% in the third week. What is the total percentage of insects killed after three weeks?
A. 60%
B. 70%
Correct C. 80%
D. 90%

Correct Answer: C

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Question 25
A bio\logist is studying the effect of light on the growth of plants. She measures the growth of 10 plants under different light conditions and obtains the following data: Plant 1: 5 cm, Plant 2: 7 cm, Plant 3: 3 cm, Plant 4: 9 cm, Plant 5: 4 cm, Plant 6: 6 cm, Plant 7: 8 cm, Plant 8: 2 cm, Plant 9: 10 cm, Plant 10: 1 cm. What is the mean growth of the plants?
A. 5 cm
B. 6 cm
Correct C. 7 cm
D. 8 cm

Correct Answer: C

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