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POST UTME ABU 2017 Biology | Objective

Are you preparing for POST UTME ABU 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.

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Question 1

In the context of cell division, what is the primary function of the spindle fibers during anaphase?

A. To separate the sister chromatids

B. To align the chromosomes at the metaphase plate

Correct C. To pull the chromosomes apart during anaphase

D. To form the nuclear envelope during telophase

Correct Answer: C

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Question 2

What is the primary difference between a prokaryotic and eukaryotic cell?

Correct A. The presence of a nucleus

B. The absence of a cell wall

C. The presence of mitochondria

D. The absence of ribosomes

Correct Answer: A

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Question 3

In the context of genetics, 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. Natural selection

Correct D. Heritability

Correct Answer: D

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Question 4

What is the primary function of the mitochondria in a cell?

A. To synthesize proteins

B. To store genetic information

Correct C. To generate energy for the cell

D. To regulate cell growth

Correct Answer: C

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Question 5

In the context of photosynthesis, what is the primary function of the light-dep\endent reactions?

A. To produce glu\cose

Correct B. To synthesize ATP and NADPH

C. To regulate stomatal opening

D. To control transpiration

Correct Answer: B

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Question 6

In a population of 1000 organisms, 80% are heterozygous for the gene controlling flower color, while 20% are homozygous recessive. If 10% of the population is randomly sampled, what is the probability that the sample will contain at least one homozygous recessive individual?

A. 0.1

Correct B. 0.2

C. 0.3

D. 0.4

Correct Answer: B

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Question 7

A researcher studying the effects of pollution on a freshwater e\cosystem notices that the concentration of a particular pollu\tant in the water is directly proportional to the square root of the number of organisms present. If the concentration of the pollu\tant is 10 mg/L when there are 100 organisms, what is the concentration of the pollu\tant when there are 400 organisms?

A. 5 mg/L

B. 10 mg/L

Correct C. 15 mg/L

D. 20 mg/L

Correct Answer: C

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Question 8

A plant has a genotype of BB and a phenotype of red flowers. If the plant is crossed with a plant having a genotype of bb and a phenotype of white flowers, what is the probability that the offspring will have red flowers?

A. 0.5

Correct B. 0.75

C. 0.9

D. 0.95

Correct Answer: B

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Question 9

A population of 1000 organisms is divided into 10 groups of 100 organisms each. If 10% of the organisms in each group are randomly sampled, what is the probability that at least one group will contain no homozygous recessive individuals?

A. 0.1

B. 0.2

C. 0.3

Correct D. 0.4

Correct Answer: D

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Question 10

A researcher studying the effects of temperature on the growth of a microorganism notices that the growth rate is directly proportional to the square of the temperature. If the growth rate is 10 units when the temperature is 20°C, what is the growth rate when the temperature is 40°C?

A. 20 units

B. 30 units

C. 40 units

Correct D. 50 units

Correct Answer: D

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Question 11

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 12

A 2.5 L flask contains a mixture of N2 and O2 gases at 25°C and 1 atm. If 1.5 L of the mixture is removed and replaced with N2, what is the new mole \fraction of O2?

A. 0.12

Correct B. 0.15

C. 0.18

D. 0.21

Correct Answer: B

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Question 13

A diagram of the human brain is shown below. Which part of the brain is responsible for regulating body temperature?

Correct A. Hypothalamus

B. Cerebellum

C. Pons

D. Medulla oblongata

Correct Answer: A

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Question 14

A 10 μL sample of a DNA solution contains 1.2 × 10^6 molecules of DNA. If the molecular weight of the DNA is 3.2 × 10^6 g/mol, what is the concentration of the DNA solution in g/L?

A. 0.00012

Correct B. 0.0012

C. 0.012

D. 0.12

Correct Answer: B

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Question 15

A diagram of a plant cell is shown below. Which part of the cell is responsible for photosynthesis?

A. Mitochondria

Correct B. Chloroplast

C. Endoplasmic reticulum

D. Golgi apparatus

Correct Answer: B

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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 dominant allele 'A'?

Correct A. 0.8

B. 0.6

C. 0.4

D. 0.2

Correct Answer: A

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Question 17

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 18

A cell is placed in a solution with a concentration of 0.1 M glu\cose. If the cell is permeable to glu\cose, what is the concentration of glu\cose inside the cell after 30 minutes?

A. 0.05 M

B. 0.075 M

Correct C. 0.1 M

D. 0.125 M

Correct Answer: C

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Question 19

A diagram of a plant cell is shown below. Identify the part labeled 'A'.

A. Mitochondria

B. Chloroplast

C. Vacuole

Correct D. Nucleus

Correct Answer: D

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Question 20

A diagram of a human eye is shown below. Identify the part labeled 'B'.

A. Cornea

Correct B. Iris

C. Lens

D. Retina

Correct Answer: B

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Question 21

In a tropical rainforest e\cosystem, what is the primary mechanism by which nutrients are cycled between organisms?

Correct A. Decomposition

B. Photosynthesis

C. Respiration

D. Transpiration

Correct Answer: A

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Question 22

A species of plant has a reproductive strategy that involves producing large numbers of small seeds. What type of reproduction is this an example of?

Correct A. Asexual reproduction

B. Sexual reproduction

C. Parthenogenesis

D. Apomixis

Correct Answer: A

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Question 23

In a human being, what is the primary function of the xylem tissue in the vascular system?

Correct A. Transport of water and minerals from roots to leaves

B. Transport of oxygen and carbon dioxide between lungs and tissues

C. Production of hormones and growth factors

D. Absorption of nutrients from the gut

Correct Answer: A

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Question 24

What is the primary mechanism by which oxygen is transported from the lungs to the tissues in the human body?

A. Diffusion through the plasma membrane

B. Active transport by the heart

Correct C. Passive transport through the bloodstream

D. Osmosis through the capillary walls

Correct Answer: C

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Question 25

In a desert e\cosystem, what is the primary mechanism by which water is conserved in plants?

Correct A. Transpiration

B. Photosynthesis

C. Respiration

D. Osmosis

Correct Answer: A

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