POST UTME MOUNTAIN TOP UNIVERSITY 2024 Biology | Objective

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Question 1 View Details
In the xylem transport system, what is the primary function of the tracheids?
Correct A. Transport of water and minerals from roots to leaves
B. Transport of sugars and other organic compounds from leaves to roots
C. Support and structural function of the plant
D. Production of hormones and other signaling molecules

Correct Answer: A

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Question 2 View Details
A population of bacteria is growing exponentially. If the initial population size is 100 and the population doubles every 2 hours, what is the population size after 6 hours?
A. 1000
B. 2000
Correct C. 4000
D. 8000

Correct Answer: C

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Question 3 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 4 View Details
A genetic cross is performed between two true-breeding lines of plants. One line has red flowers and the other line has white flowers. What is the probability that the offspring will have pink flowers?
A. 0.25
Correct B. 0.5
C. 0.75
D. 1.0

Correct Answer: B

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Question 5 View Details
A diagram of a human respiratory system is shown below. Identify the part labeled B.
A. Trachea
Correct B. Lungs
C. Diaphragm
D. Bronchi

Correct Answer: B

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Question 6 View Details
In a tropical rainforest e\cosystem, what is the primary role of the emergent layer in maintaining the balance of the entire e\cosystem?
A. To provide shade and shelter for the understory plants
Correct B. To intercept and absorb most of the sunlight, reducing the amount available to the understory plants
C. To act as a windbreak, protecting the understory plants from strong winds
D. To serve as a food source for the herbivores that live in the understory

Correct Answer: B

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Question 7 View Details
A cell has a membrane potential of -70 mV. If the cell is stimulated to fire an action potential, what is the direction of the rapid depolarization phase?
A. The membrane potential becomes more negative
Correct B. The membrane potential becomes less negative
C. The membrane potential remains the same
D. The membrane potential becomes more positive

Correct Answer: B

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Question 8 View Details
A population of rabbits is growing \logistically. If the carrying capacity of the environment is 1000 rabbits, and the initial population size is 100 rabbits, what is the population size after 5 years?
A. 500
B. 750
C. 900
Correct D. 1000

Correct Answer: D

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Question 9 View Details
A plant has a photosynthetic rate of 10 μmol CO2/s. If the light intensity is increased by a factor of 4, what is the new photosynthetic rate?
A. 20 μmol CO2/s
B. 40 μmol CO2/s
C. 80 μmol CO2/s
Correct D. 160 μmol CO2/s

Correct Answer: D

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Question 10 View Details
A species of bird has a clutch size of 4 eggs. If the reproductive rate of the species is 0.8, what is the expected number of offspring per breeding pair after 3 generations?
A. 4
B. 8
C. 16
Correct D. 32

Correct Answer: D

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Question 11 View Details
In a population of 1000 individuals, 20% are homozygous dominant (BB), 40% are heterozygous (Bb), and 40% are homozygous recessive (bb). What is the probability that two individuals chosen at random will have offspring with the BB genotype?
Correct A. 0.2
B. 0.4
C. 0.6
D. 0.8

Correct Answer: A

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Question 12 View Details
A 2.0-mL sample of a solution containing 0.1 M NaCl is added to a 10.0-mL sample of a solution containing 0.05 M NaCl. What is the resulting concentration of NaCl in the mixture?
A. 0.01 M
Correct B. 0.015 M
C. 0.02 M
D. 0.025 M

Correct Answer: B

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Question 13 View Details
A diagram of a plant cell is shown below. Identify the part labeled A.
A. Mitochondria
B. Chloroplast
Correct C. Nucleus
D. Vacuole

Correct Answer: C

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Question 14 View Details
A 5.0-mL sample of a solution containing 0.2 M glu\cose is added to a 15.0-mL sample of a solution containing 0.1 M glu\cose. What is the resulting concentration of glu\cose in the mixture?
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 15 View Details
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 16 View Details
In a typical mammalian kidney, which of the following structures is primarily responsible for the reabsorption of glu\cose from the filtrate?
Correct A. Proximal convoluted tubule
B. Distal convoluted tubule
C. Loop of Henle
D. Collecting duct

Correct Answer: A

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Question 17 View Details
The process by which plants convert light energy into chemical energy is known as?
Correct A. Photosynthesis
B. Respiration
C. Transpiration
D. Translocation

Correct Answer: A

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Question 18 View Details
The hormone responsible for the stimulation of appetite is?
A. Insulin
B. Glucagon
Correct C. Ghrelin
D. Leptin

Correct Answer: C

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Question 19 View Details
The process by which the body maintains a stable internal environment despite changes in the external environment is known as?
Correct A. Homeostasis
B. Regulation
C. Adaptation
D. Acclimatization

Correct Answer: A

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Question 20 View Details
The type of connective tissue that provides support and structure to the body is?
Correct A. Bone
B. Cartilage
C. Ligament
D. T\endon

Correct Answer: A

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Question 21 View Details
In a eukaryotic cell, the process of mitosis is initiated by the breakdown of the nuclear envelope, which is mediated by the action of which of the following proteins?
A. Histone deacetylase
B. Conden\sin
Correct C. Separase
D. Topoisomerase

Correct Answer: C

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Question 22 View Details
The diagram below shows the structure of a plant cell. Which of the following organelles is responsible for the synthesis of proteins?
A. Mitochondria
B. Chloroplast
Correct C. Ribosome
D. Endoplasmic reticulum

Correct Answer: C

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Question 23 View Details
The process of photosynthesis in plants involves the conversion of light energy into chemical energy, which is stored in the form of which of the following molecules?
A. ATP
B. NADPH
Correct C. Glu\cose
D. Oxygen

Correct Answer: C

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Question 24 View Details
The diagram below shows the structure of a human eye. Which of the following parts is responsible for detecting light and transmitting visual signals to the brain?
A. Lens
B. Cornea
Correct C. Retina
D. Optic nerve

Correct Answer: C

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Question 25 View Details
The process of cellular respiration in cells involves the breakdown of glu\cose to produce energy, which is stored in the form of which of the following molecules?
Correct A. ATP
B. NADH
C. FADH2
D. Pyruvate

Correct Answer: A

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