The process by which plants synthesize food using light energy is: MCQ with Answer and Explanation

The process by which plants synthesize food using light energy is:
A. Photosynthesis
B. Chemosynthesis
C. Respiration
D. Transpiration
Answer: Option A
Solution (By JKSSB Mock Tests)
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy (glucose) using carbon dioxide and water, releasing oxygen. It occurs in chloroplasts. Respiration releases energy from organic molecules. Transpiration is water loss. Chemosynthesis uses chemical energy (by some bacteria).

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Practice More Biology Questions

Question #1
Consider the following statements about the pancreas:
1. It has both endocrine and exocrine functions.
2. Alpha cells secrete insulin.
3. Beta cells secrete glucagon.
Which of the above is/are correct?
A. 1 only
B. 2 only
C. 2 and 3
D. 3 only

Correct Answer: Option A


Explanation:
The pancreas is a mixed gland (1). Alpha cells secrete glucagon, beta cells insulin. Thus, 2 and 3 are swapped and incorrect.

This question belongs to: Science Biology
Question #2
The scientist who proposed the 'chemiosmotic hypothesis' for ATP synthesis was:
A. Peter Mitchell
B. Hans Krebs
C. Melvin Calvin
D. Fritz Lipmann

Correct Answer: Option A


Explanation:
Peter Mitchell proposed the chemiosmotic theory (1961), explaining that a proton gradient across a membrane drives ATP synthesis. Krebs discovered the citric acid cycle, Calvin the Calvin cycle, Lipmann discovered coenzyme A.

This question belongs to: Science Biology
Question #3
Consider statements about plant biology: 1. The stigma is the receptive part of the carpel. 2. The anther is the pollen-producing part of the stamen. 3. The ovary develops into the seed after fertilization. Which are correct?
A. 2 and 3 only
B. 1 and 3 only
C. 1, 2 and 3
D. 1 and 2 only

Correct Answer: Option D


Explanation:
The carpel is the female reproductive organ of a flower, consisting of the ovary, style, and stigma; the stigma is the terminal, sticky receptive surface where pollen grains land and germinate. The stamen is the male reproductive organ, consisting of the filament and the anther; the anther is the terminal sac where pollen grains (male gametophytes) are produced. After fertilization, the ovule develops into the seed, while the ovary wall matures and develops into the fruit. Thus, statements 1 and 2 are correct.

This question belongs to: Science Biology