The intine of pollen grains is composed of

Options

A. Lipid and protein
B. Cellulose and pectin
C. Lignin and cutin
D. Pectin and lignin

Answer

To solve the question regarding the composition of the intine of pollen grains, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Pollen Grains**:
- Pollen grains are microscopic structures that carry the male gametes (reproductive cells) of plants. They are crucial for the process of fertilization in flowering plants.

2. **Layers of Pollen Grains**:
- Pollen grains consist of two main layers: the outer layer known as the exine (or exospore) and the inner layer known as the intine (or endospore).

3. **Composition of Intine**:
- The intine is the inner layer of the pollen grain. It is primarily composed of two substances: cellulose and pectin. These materials provide structural support and help in the hydration of the pollen grain.

4. **Composition of Exine**:
- In contrast, the exine is made up of a highly resistant material called sporopollenin, which is known for its durability and resistance to decay.

5. **Identifying the Correct Answer**:
- Given the options:
a. lipid and protein
b. cellulose and pectin
c. lignin and cutin
d. pectin and lignin
- The correct answer is **b. cellulose and pectin**, as these are the components that make up the intine of pollen grains.

### Final Answer:
The intine of pollen grains is composed of **cellulose and pectin**.

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