Dead cells of cork contain a chemical in their wall that makes them impervious to gases and water. The chemical is :

Options

A. Lignin
B. Suberin
C. Mucilage
D. Sucrose

Explanation

To solve the question about the chemical found in the dead cells of cork that makes them impervious to gases and water, we can follow these steps:

### Step 1: Identify the structure of cork
Cork is made up of dead cells that are part of the outer bark of trees. These cells are known for their protective properties.

**Hint:** Consider the role of cork in protecting the plant and preventing water loss.

### Step 2: Understand the composition of cork cells
The cell walls of cork cells contain specific substances that contribute to their impermeability.

**Hint:** Think about what materials are commonly associated with plant cell walls that provide strength and protection.

### Step 3: Consider the chemicals in cork
The primary chemical that makes cork impermeable to gases and water is suberin. Suberin is a waxy substance that forms a barrier, preventing the passage of water and gases.

**Hint:** Recall that suberin is often discussed in the context of cork and its protective functions.

### Step 4: Confirm the properties of suberin
Suberin is a hydrophobic (water-repelling) compound, which is why cork cells can effectively prevent water loss and gas exchange.

**Hint:** Reflect on how this property is beneficial for the plant's survival in various environments.

### Conclusion
The chemical in the dead cells of cork that makes them impervious to gases and water is **suberin**.

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