Which one of the following is resistant to enzyme action?

Options

A. Cork
B. Wood fibre
C. Pollen exine
D. Leaf cuticle

Explanation

To solve the question "Which one of the following is resistant to enzyme action?", we can follow these steps:

### Step 1: Understand the Options
We have four options to consider:
1. Cork
2. Wood fiber
3. Pollen exine
4. Leaf cuticle

### Step 2: Define Enzyme Action
Enzymes are biological catalysts that speed up chemical reactions. They can break down various organic materials, but some substances are resistant to their action.

### Step 3: Analyze Each Option
- **Cork**: This is a protective layer derived from the bark of trees. It can be affected by enzymes.
- **Wood Fiber**: This is made up of cellulose and can also be broken down by enzymes.
- **Pollen Exine**: This is the outer layer of pollen grains, known for its toughness and resistance to degradation.
- **Leaf Cuticle**: This is a waxy layer on leaves that protects against water loss and can be affected by certain enzymes.

### Step 4: Identify the Resistant Material
Among the options, **Pollen Exine** is known to be resistant to enzyme action due to its composition of sporopollenin, which is one of the most durable organic materials. It can withstand high temperatures and harsh chemicals, including strong acids and alkalis.

### Step 5: Conclusion
Thus, the correct answer to the question is **Pollen Exine**.

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