POST UTME BABCOCK UNIVERSITY 2018 Biology | Objective

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Question 1 View Details
In the xylem transport system, what is the primary function of the xylem parenchyma cells?
Correct A. To transport water and minerals from the roots to the leaves
B. To store food and water for the plant
C. To provide structural support to the plant
D. To produce hormones that regulate plant growth

Correct Answer: A

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Question 2 View Details
Which of the following is an example of a symbiotic relationship in the classification of living things?
A. Predator-prey relationship between a lion and a zebra
Correct B. Mutualism between bees and flowers
C. Competition between two species for resources
D. Commensalism between a remora fish and a shark

Correct Answer: B

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Question 3 View Details
In the nervous system, what is the primary function of the synapse?
Correct A. To transmit nerve impulses from one neuron to another
B. To store nerve impulses for later use
C. To provide structural support to the neuron
D. To produce hormones that regulate body functions

Correct Answer: A

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Question 4 View Details
In the process of growth and regulation, what is the primary function of the auxin hormone?
Correct A. To promote cell elongation and cell division
B. To inhibit cell growth and cell division
C. To regulate stomatal opening and clo\sing
D. To produce flowers and fruits

Correct Answer: A

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Question 5 View Details
In the classification of living things, what is the primary characteristic that distinguishes between prokaryotic and eukaryotic cells?
Correct A. The presence of a true nucleus
B. The absence of a true nucleus
C. The presence of mitochondria
D. The absence of chloroplasts

Correct Answer: A

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Question 6 View Details
In a population of Drosophila melanogaster, the frequency of the recessive allele 'r' is 0.2. If the population size is 1000, what is the expected number of homozygous recessive individuals?
Correct A. 180
B. 200
C. 220
D. 240

Correct Answer: A

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Question 7 View Details
A plant with the genotype AaBbCcc is crossed with a plant with the genotype AaBbDdd. What is the probability that the offspring will have the genotype AaBbCc?
A. 1/4
Correct B. 1/2
C. 3/4
D. 1

Correct Answer: B

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Question 8 View Details
A solution of 0.1 M NaCl is prepared by dissolving 5.84 g of NaCl in 1000 mL of water. What is the concentration of the solution in molarity?
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 9 View Details
A 2.5 L flask contains 0.5 g of O2 at 25°C and 1 atm. What is the partial pressure of O2?
A. 0.5 atm
B. 0.75 atm
Correct C. 1 atm
D. 1.25 atm

Correct Answer: C

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Question 10 View Details
A 10% solution of glu\cose is prepared by dissolving 10 g of glu\cose in 90 g of water. What is the concentration of the solution in molarity?
A. 0.1 M
Correct B. 0.5 M
C. 1 M
D. 5 M

Correct Answer: B

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Question 11 View Details
In a desert e\cosystem, what is the primary mechanism by which plants conserve water?
A. CAM photosynthesis
B. C4 photosynthesis
Correct C. Crassulacean acid metabolism
D. Stomatal closure

Correct Answer: C

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Question 12 View Details
A cell is placed in a hypertonic solution. What will happen to the cell?
Correct A. The cell will swell and eventually burst.
B. The cell will shrink and eventually die.
C. The cell will remain unchanged.
D. The cell will grow and divide.

Correct Answer: A

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Question 13 View Details
What is the process by which plants convert light energy into chemical energy?
A. Respiration
Correct B. Photosynthesis
C. Decomposition
D. Fermentation

Correct Answer: B

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Question 14 View Details
A diagram of a plant cell is shown below. Identify the part labeled 'A'.
Correct A. Nucleus
B. Mitochondria
C. Chloroplast
D. Vacuole

Correct Answer: A

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Question 15 View Details
What is the term for the movement of water from the roots to the leaves of a plant?
Correct A. Transpiration
B. Translocation
C. Osmosis
D. Diffusion

Correct Answer: A

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Question 16 View Details
In the context of evolutionary theory, what is the primary mechanism by which genetic drift acts on a population?
A. Mutation
B. Gene flow
Correct C. Genetic drift
D. Natural selection

Correct Answer: C

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Question 17 View Details
A diagram of the human eye is shown below. Identify the part labeled 'A'?
Correct A. Cornea
B. Iris
C. Retina
D. Lens

Correct Answer: A

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Question 18 View Details
In asexual reproduction, what is the primary mechanism by which genetic variation is introduced into a population?
A. Mutation
B. Gene flow
C. Genetic drift
Correct D. Genetic recombination

Correct Answer: D

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Question 19 View Details
A diagram of the xylem tissue is shown below. Identify the part labeled 'B'?
A. Tracheid
Correct B. Xylem vessel
C. Phloem fiber
D. Pith

Correct Answer: B

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Question 20 View Details
In the context of eco\logical succession, what is the primary mechanism by which a community changes over time?
A. Competition
B. Predation
C. Mutualism
Correct D. Succession

Correct Answer: D

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Question 21 View Details
The nervous system's ability to coordinate voluntary movements is primarily due to the integration of information from sensory receptors and motor neurons. Which of the following best describes the type of synapse involved in this process?
A. Chemical synapse
Correct B. Electrical synapse
C. Mechanoreceptor
D. Motor neuron

Correct Answer: B

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Question 22 View Details
The classification of living organisms into kingdoms is based on the following characteristics. Which of the following is NOT a characteristic used in the classification of living organisms?
A. Cell wall presence
B. Cell membrane presence
C. Mitochondria presence
Correct D. Photosynthesis

Correct Answer: D

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Question 23 View Details
The human body's ability to maintain homeostasis is primarily due to the regulation of body temperature. Which of the following organs plays a crucial role in this process?
A. Kidneys
B. Liver
C. Pancreas
Correct D. Hypothalamus

Correct Answer: D

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Question 24 View Details
The process of evolution is driven by the accumulation of genetic mutations over time. Which of the following best describes the type of mutation that results in a change in the DNA sequence?
Correct A. Point mutation
B. Frameshift mutation
C. Deletion
D. Insertion

Correct Answer: A

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Question 25 View Details
The human body's ability to respond to stress is primarily due to the activation of the hypothalamic-pituitary-adrenal (HPA) axis. Which of the following hormones plays a crucial role in this process?
A. Adrenaline
Correct B. Cortisol
C. Insulin
D. Growth hormone

Correct Answer: B

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