The abscission layer is covered by a leaf scar which is composed of

Options

A. Pectose and cellulose
B. Suberin
C. Pectin
D. Cutin

Explanation

To answer the question about the composition of the leaf scar that covers the abscission layer, we can follow these steps:

### Step 1: Understand the Abscission Layer
The abscission layer is a specialized layer of cells that forms at the base of the petiole (the stalk that attaches the leaf to the plant). This layer is responsible for the separation of the leaf from the plant during the process of leaf fall.

**Hint:** Think about what happens to leaves in autumn and how they detach from the plant.

### Step 2: Identify the Composition of the Leaf Scar
The leaf scar is the mark left on the stem after the leaf has fallen. It is formed from the cells that were part of the abscission layer. The composition of the leaf scar is primarily made up of substances that provide a protective barrier.

**Hint:** Consider what materials in plants are known for their protective qualities.

### Step 3: Analyze the Options Given
The options provided are:
- Pectogen cellulose
- Swearing
- Pectin
- Cutin

We need to determine which of these materials is primarily involved in the formation of the leaf scar.

**Hint:** Look for a substance that is known to be involved in cell wall structure and protection.

### Step 4: Determine the Correct Answer
Among the options, **Cutin** is the correct answer. Cutin is a waxy substance that forms a protective layer on the surface of plant organs, including leaf scars. It helps to prevent water loss and protects the underlying tissues.

**Hint:** Recall that cutin is often associated with the outer layers of plant tissues and provides a waterproof barrier.

### Final Answer
The abscission layer is covered by a leaf scar which is composed of **Cutin**.