Purple cabbage leaves do not loose their colour in cold water but do so in boiling water because

Options

A. boiling water enters the cell easily
B. plasmalemma is killed in boiling water
C. pigment is not soluble in cold water
D. cell wall is coagulated in boiling water

Answer

### Step-by-Step Solution:

1. **Understanding the Composition of Water**:
- Water (H2O) remains chemically the same whether it is cold or boiling. This means that both cold and hot water can enter the cells of the purple cabbage.

2. **Role of the Plasma Lemma**:
- The plasma lemma (or plasma membrane) is a protective membrane that surrounds the cell. It regulates what enters and exits the cell.

3. **Effect of Temperature on the Plasma Lemma**:
- When the cabbage leaves are placed in boiling water, the high temperature causes the plasma lemma to become inactivated or damaged. This means that the membrane can no longer effectively contain the pigments within the cell.

4. **Release of Pigments**:
- The pigments responsible for the purple color in cabbage are released into the boiling water because the damaged plasma lemma allows them to escape. In contrast, in cold water, the plasma lemma remains intact, so the pigments do not leak out.

5. **Conclusion**:
- Therefore, the reason purple cabbage leaves do not lose their color in cold water but do so in boiling water is that the plasma lemma is damaged in boiling water, allowing the pigments to escape.

### Final Answer:
Purple cabbage leaves do not lose their color in cold water but do so in boiling water because the plasma lemma is damaged in boiling water, allowing the pigments to leak out.

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