POST UTME NOUN 2019 Biology | Objective

Practice these randomly selected questions to test your readiness.

Question 1
In a typical plant cell, the process of photosynthesis occurs in the following organelle:
A. Mitochondria
B. Chloroplast
C. Nucleus
D. Vacuole
Question 2
A 2.5 L flask contains 1.5 mol of an ideal gas at 27°C. If 1.0 mol of gas is added to the flask, what is the new pressure?
A. 101325 Pa
B. 1013250 Pa
C. 10132500 Pa
D. 101325000 Pa
Question 3
The process by which the body gets rid of waste products and excess subs\tances is called:
A. Respiration
B. Photosynthesis
C. Excretion
D. Osmosis
Question 4
The process by which the body gets rid of excess heat through sweating is called:
A. Respiration
B. Photosynthesis
C. Evaporation
D. Osmosis
Question 5
A diagram of the xylem tissue in a plant stem is shown below. What is the primary function of the xylem tissue in this context?
A. Transport of water and minerals
B. Support and structure
C. Storage of nutrients
D. Regulation of gas exchange
Question 6
In the context of evolutionary theories, what is the term for the process by which a species becomes reproductively isolated from other species?
A. Speciation
B. Adaptation
C. Gene flow
D. Mutation
Question 7
The sense organ responsible for detecting changes in light intensity is:
A. Eye
B. Ear
C. Nose
D. Skin
Question 8
The sense organ responsible for detecting changes in sound waves is:
A. Eye
B. Ear
C. Nose
D. Skin
Question 9
A researcher studying the eco\logy of a freshwater lake discovers that the primary producers are mostly algae and aquatic plants. What is the most likely reason for the dominance of these organisms?
A. High levels of dissolved nutrients
B. Low levels of dissolved oxygen
C. Presence of a dominant predator
D. High levels of water flow
Question 10
A cell is placed in a solution with a high concentration of glu\cose. What happens to the cell's membrane potential?
A. The membrane potential becomes more negative
B. The membrane potential becomes more positive
C. The membrane potential remains unchanged
D. The membrane potential becomes zero
Question 11
The process of cellular respiration can be represented by the following equation: \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \). What is the overall equation for the process?
A. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP \)
B. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 2ATP \)
C. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 3ATP \)
D. \( C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + 4ATP \)
Question 12
In the context of genetics, what is the term for the process by which a gene is expressed in a specific tissue or cell type?
A. Gene regulation
B. Gene expression
C. Gene mutation
D. Gene silencing
Question 13
A genetic cross is performed between two true-breeding lines of pea plants. One line has green pods and the other line has yellow pods. What is the probability that the offspring will have green pods?
A. 0.25
B. 0.5
C. 0.75
D. 1.0
Question 14
The cell wall of a plant cell is primarily composed of
A. Chitin
B. Cellulose
C. Pectin
D. Lignin
Question 15
The process by which the body gets rid of waste products through the kidneys is called:
A. Respiration
B. Photosynthesis
C. Excretion
D. Osmosis

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