Question:
Respiration
(A) Occurs only in cells with chloroplasts
(B) Oxygen is used and water is produced
(C) Occurs in dark and light
(D) Occurs in light only
Choose the correct answer from the options given below:
Respiration
(A) Occurs only in cells with chloroplasts
(B) Oxygen is used and water is produced
(C) Occurs in dark and light
(D) Occurs in light only
Choose the correct answer from the options given below:
(A) Occurs only in cells with chloroplasts
(B) Oxygen is used and water is produced
(C) Occurs in dark and light
(D) Occurs in light only
Choose the correct answer from the options given below:
Show Hint
Remember: Plants photosynthesize only in the presence of light, but they must respire continuously (day and night) to survive.
Updated On: Jul 23, 2026
- (A), (B) and (D) only.
- (B) and (C) only.
- (A), (B), (C) and (D).
- (B), (C) and (D) only.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Respiration is a vital metabolic process in all living organisms.
It involves breaking down organic molecules (like glucose) to release energy, which is stored as ATP to support cellular activities.
Step 2: Detailed Explanation:
Let us evaluate each statement regarding cellular respiration:
- Statement (A): Respiration occurs only in cells with chloroplasts. (False)
Respiration occurs in the mitochondria and cytoplasm of *all* living cells, including non-photosynthetic plant tissues (like roots) and animal cells that lack chloroplasts.
- Statement (B): Oxygen is used and water is produced. (True)
Aerobic respiration uses oxygen as a terminal electron acceptor to break down glucose, producing carbon dioxide, water, and ATP:
\[ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP} \]
- Statement (C): Occurs in dark and light. (True)
Unlike photosynthesis, which requires light, cellular respiration is a continuous process that occurs 24 hours a day, in both light and dark conditions, to keep cells alive.
- Statement (D): Occurs in light only. (False)
This contradicts Statement (C) and is biochemically incorrect.
Therefore, only statements (B) and (C) are correct.
Step 3: Final Answer:
The correct option is (B) and (C) only, corresponding to option (B).
Respiration is a vital metabolic process in all living organisms.
It involves breaking down organic molecules (like glucose) to release energy, which is stored as ATP to support cellular activities.
Step 2: Detailed Explanation:
Let us evaluate each statement regarding cellular respiration:
- Statement (A): Respiration occurs only in cells with chloroplasts. (False)
Respiration occurs in the mitochondria and cytoplasm of *all* living cells, including non-photosynthetic plant tissues (like roots) and animal cells that lack chloroplasts.
- Statement (B): Oxygen is used and water is produced. (True)
Aerobic respiration uses oxygen as a terminal electron acceptor to break down glucose, producing carbon dioxide, water, and ATP:
\[ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP} \]
- Statement (C): Occurs in dark and light. (True)
Unlike photosynthesis, which requires light, cellular respiration is a continuous process that occurs 24 hours a day, in both light and dark conditions, to keep cells alive.
- Statement (D): Occurs in light only. (False)
This contradicts Statement (C) and is biochemically incorrect.
Therefore, only statements (B) and (C) are correct.
Step 3: Final Answer:
The correct option is (B) and (C) only, corresponding to option (B).
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