Refer to the given dichotomous key and select the incorrect statement regarding it.
(i) (a) It is a fibre obtained from plant source -Go to (ii)
(b) It is a fibre obtained from animal source - Go to (iii)
(ii) (a) Fibre is obtained from fruit of the plant-Q
(b) Fibre is obtained from stem of the plant - R
(iii) (a) Fibre is obtained from an insect-S
(b) Fibre is obtained from a mammal - T

Options

A. Q could be obtained without harming the source plant whereas R could be obtained by harming the source plant.
B. S could be a fibre that has maximum water absorbing capacity and the fabric made from it, is the most preferred one for wearing in winters.
C. T could be a proteinaceous fibre and could trap air in the pockets formed between individual fibres, thus provides us warmth.
D. Retting can be involved in the processing of fibre R whereas shearing and scouring can be involved in the processing of fibre T.

Explanation

To solve the question regarding the dichotomous key and select the incorrect statement, we will analyze each part of the key step by step.

### Step-by-Step Solution:

1. **Understanding the Dichotomous Key:**
- The key is structured to help identify fibers based on their source (plant or animal) and further classify them based on specific characteristics.

2. **Analyzing Plant Source (Go to ii):**
- **(ii) (a)**: "Fibre is obtained from fruit of the plant - Q"
- This refers to fibers like cotton, which is derived from the fruit (bolls) of the cotton plant.
- **(ii) (b)**: "Fibre is obtained from stem of the plant - R"
- This refers to fibers like jute or flax, which are obtained from the stem of the plant.

3. **Analyzing Animal Source (Go to iii):**
- **(iii) (a)**: "Fibre is obtained from an insect - S"
- This typically refers to silk, which is produced by silkworms (insects).
- **(iii) (b)**: "Fibre is obtained from a mammal - T"
- This refers to fibers like wool, which is obtained from sheep (mammals).

4. **Identifying Incorrect Statements:**
- We need to evaluate the statements derived from the key to find the incorrect one.
- **Statement Q**: "Fibre obtained from fruit (cotton) does not harm the plant."
- **Statement R**: "Fibre obtained from stem (jute/flax) requires cutting the plant."
- **Statement S**: "Fibre obtained from insect (silk) has maximum water-absorbing capacity."
- This is likely incorrect as silk does not have high water-absorbing capacity.
- **Statement T**: "Fibre obtained from mammal (wool) is preferred for winter wear."
- **Processing Statements**:
- R (flax/jute) involves retting.
- T (wool) involves shearing and scoring.

5. **Conclusion:**
- The incorrect statement is regarding **S**: "Fibre obtained from insect has maximum water-absorbing capacity." This is false as silk does not absorb water well.

### Final Answer:
The incorrect statement is: "Fibre obtained from insect (S) has maximum water-absorbing capacity."

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