The process by which plants release oxygen is: MCQ with Answer and Explanation

Question
The process by which plants release oxygen is:
A. Respiration
B. Nitrogen fixation
C. Photosynthesis
D. Transpiration
Answer: Option C
Solution (By JKExamLibrary)
During photosynthesis, water is split (photolysis), releasing oxygen as a byproduct. Respiration consumes oxygen, nitrogen fixation uses nitrogenase, transpiration releases water vapor.
This question belongs to: Science Biology
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Question #1
The process of water loss as vapor from leaves is:
A. Guttation
B. Evaporation
C. Transpiration
D. Translocation
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Correct Answer: Option C

Explanation:
Transpiration mainly occurs through stomata and drives the transpiration pull for water movement. Guttation is liquid loss, evaporation from free surface.
This question belongs to: Science Biology
Question #2
A virus particle (virion) consists of genetic material enclosed in a protein coat called:
A. Plasmid
B. Cell wall
C. Capsid
D. Envelope
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Correct Answer: Option C

Explanation:
A virus is an obligate intracellular parasite. The basic structure of a virus particle, or virion, consists of genetic material (either DNA or RNA, but never both) enclosed in a protective protein coat called a capsid, made of subunits called capsomeres. Some viruses also have an outer lipid envelope derived from the host cell membrane.
This question belongs to: Science Biology
Question #3
Consider the following statements about the human kidneys:
1. They are located in the abdominal cavity.
2. They produce the hormone renin.
3. They filter approximately 180 liters of blood per day.
Which of the above is/are correct?
A. 1 and 2 only
B. 1 and 3 only
C. 2 and 3 only
D. 1, 2, and 3
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Correct Answer: Option C

Explanation:
Kidneys are retroperitoneal, not in the abdominal cavity proper. They produce renin, and filter ~180 L/day (GFR ~125 mL/min). So 1 is incorrect.
This question belongs to: Science Biology
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