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Assertion :- Long distance transport of ...

Assertion :- Long distance transport of substances within plant cannot be by diffusion alone.
Reason:- Diffusion is a slow process

A

(A)If both Assertion & Reason are True &the Reason is a correct explanation of the Assertion.

B

(B)If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

C

(C)If Assertion is True but the Reason is False.

D

(D)If both Assertion & Reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Text Solution: 1. **Understanding the Assertion**: The assertion states that "long distance transport of substances within plants cannot be by diffusion alone." This implies that for transporting substances over long distances within a plant, other mechanisms must be involved. 2. **Understanding the Reason**: The reason provided is that "diffusion is a slow process." This indicates that diffusion, which is the movement of substances from an area of higher concentration to an area of lower concentration, does not occur quickly enough to facilitate long-distance transport in plants. 3. **Analyzing Diffusion**: Diffusion is indeed a natural process that occurs due to the concentration gradient. However, it is limited by the distance over which it can effectively transport substances. The farther the distance, the longer it takes for substances to diffuse, which is not efficient for the needs of a plant. 4. **Need for Other Transport Mechanisms**: For long-distance transport, plants utilize mechanisms such as bulk flow, which is driven by pressure differences (e.g., transpiration pull in xylem for water transport). These mechanisms are much faster and more efficient than diffusion alone. 5. **Conclusion**: Since the assertion is true (long-distance transport cannot rely solely on diffusion) and the reason correctly explains why (because diffusion is a slow process), we can conclude that both the assertion and the reason are correct, and the reason is indeed the correct explanation for the assertion. ### Final Answer: Both the assertion and the reason are true, and the reason is the correct explanation for the assertion.
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