POST UTME BABCOCK UNIVERSITY 2017 Biology | Objective

Are you preparing for POST UTME BABCOCK UNIVERSITY 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 cellular respiration, what is the primary function of the electron transport chain?
A. To generate ATP through substrate-level phosphorylation
Correct B. To pump protons across the mitochondrial membrane, creating a proton gradient
C. To reduce NADH and FADH2 to NAD+ and FAD
D. To produce water and carbon dioxide as byproducts

Correct Answer: B

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Question 2
A researcher is studying the effects of climate change on a specific e\cosystem. Which of the following biomes is most likely to be affected by changes in temperature and precipitation patterns?
A. Tropical rainforest
B. Temperate grassland
Correct C. Boreal forest
D. Desert

Correct Answer: C

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Question 3
A cell is in the process of mitosis. Which stage of mitosis is characterized by the condensation of chromosomes and the formation of the spindle apparatus?
Correct A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

Correct Answer: A

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Question 4
A population of rabbits is growing exponentially. If the initial population is 100 rabbits and the growth rate is 20% per year, what will be the population size after 5 years?
A. 1000
B. 2000
Correct C. 4000
D. 8000

Correct Answer: C

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Question 5
A diagram of the human circulatory system is shown below. What is the function of the pulmonary valve?
Correct A. To regulate blood flow from the heart to the lungs
B. To regulate blood flow from the lungs to the heart
C. To regulate blood flow from the heart to the aorta
D. To regulate blood flow from the aorta to the heart

Correct Answer: A

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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'?
Correct A. 0.64
B. 0.36
C. 0.16
D. 0.04

Correct Answer: A

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Question 7
A 2.5 L flask contains 0.5 mol of an ideal gas at 25°C. If 1.0 mol of the gas is added to the flask, what is the new pressure of the gas?
A. 2.5 atm
Correct B. 3.0 atm
C. 4.0 atm
D. 5.0 atm

Correct Answer: B

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Question 8
A plant grows in a controlled environment with a cons\tant temperature of 25°C and a photoperiod of 12 hours. If the plant is grown for 30 days, what is the expected growth rate?
A. 0.5 cm/day
Correct B. 1.0 cm/day
C. 1.5 cm/day
D. 2.0 cm/day

Correct Answer: B

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Question 9
A 50 mL sample of a solution containing 0.1 M NaCl is added to a 100 mL sample of a solution containing 0.2 M NaOH. What is the resulting pH?
A. 8.0
Correct B. 9.0
C. 10.0
D. 11.0

Correct Answer: B

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Question 10
A population of rabbits is growing at a rate of 20% per year. If the initial population is 100 rabbits, what is the population after 5 years?
A. 163.9
B. 164.9
Correct C. 165.9
D. 166.9

Correct Answer: C

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Question 11
In the context of eco\logy, what is the primary function of a keystone species?
A. To regulate the population of other species
B. To provide a source of food for other species
C. To create a habitat for other species
Correct D. To influence the structure of its e\cosystem

Correct Answer: D

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Question 12
A plant cell is placed in a solution containing 0.5 M glu\cose. If the cell membrane is permeable to glu\cose, what will happen to the concentration of glu\cose inside the cell?
A. The concentration of glu\cose will increase
B. The concentration of glu\cose will decrease
Correct C. The concentration of glu\cose will remain the same
D. The concentration of glu\cose will increase and then decrease

Correct Answer: C

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Question 13
A diagram of a plant's xylem is shown below. What is the primary function of the xylem in this plant?
Correct A. To transport water and minerals from the roots to the leaves
B. To transport sugars and other organic compounds from the leaves to the roots
C. To provide structural support to the plant
D. To regulate the plant's water balance

Correct Answer: A

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Question 14
A diagram of a human eye is shown below. What is the primary function of the retina in this eye?
A. To focus light onto the lens
Correct B. To detect light and transmit signals to the brain
C. To regulate the amount of light entering the eye
D. To provide structural support to the eye

Correct Answer: B

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Question 15
A diagram of a human brain is shown below. What is the primary function of the cerebral cortex in this brain?
A. To regulate the body's autonomic functions
Correct B. To process sensory information and control movement
C. To store and retrieve memories
D. To regulate the body's emotional responses

Correct Answer: B

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Question 16
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population is in Hardy-Weinberg equilibrium, what is the expected frequency of the homozygous dominant genotype?
Correct A. 0.36
B. 0.64
C. 0.16
D. 0.48

Correct Answer: A

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Question 17
A solution containing 0.1 M NaCl is added to a solution containing 0.1 M KNO3. What is the expected pH of the resulting solution?
A. 4.5
Correct B. 5.5
C. 6.5
D. 7.5

Correct Answer: B

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Question 18
A cell is placed in a solution containing 0.1 M glu\cose. The cell membrane is permeable to glu\cose. What is the expected concentration of glu\cose inside the cell after 1 hour?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 19
A plant is placed in a solution containing 0.1 M KNO3. The plant's roots are permeable to K+ ions. What is the expected concentration of K+ ions in the plant's xylem after 1 hour?
A. 0.05 M
Correct B. 0.1 M
C. 0.15 M
D. 0.2 M

Correct Answer: B

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Question 20
A diagram of a plant's root system is shown below. What is the function of the labeled structure?
A. absorption of water
Correct B. absorption of nutrients
C. transport of water
D. transport of nutrients

Correct Answer: B

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Question 21
In a tropical rainforest, the energy flow from producers to primary consumers is typically described by which of the following trophic levels?
Correct A. Producers > Primary Consumers > Secondary Consumers
B. Producers > Primary Consumers > Tertiary Consumers
C. Producers > Herbivores > Carnivores
D. Producers > Decomposers > Detritivores

Correct Answer: A

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Question 22
The process by which plants convert light energy into chemical energy is called?
A. Respiration
Correct B. Photosynthesis
C. Transpiration
D. Translocation

Correct Answer: B

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Question 23
The structure that connects the phloem and xylem tissues in a plant is called?
A. Cortex
B. Endodermis
C. Pericycle
Correct D. Phloem-Xylem Bundle

Correct Answer: D

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Question 24
The process by which the body regulates the amount of water in the blood is called?
A. Osmosis
B. Diffusion
C. Active Transport
Correct D. Hormonal Regulation

Correct Answer: D

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Question 25
The type of tissue that provides support and structure to the body is called?
A. Epithelial Tissue
Correct B. Connective Tissue
C. Muscle Tissue
D. Nervous Tissue

Correct Answer: B

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