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 the male gametophytes in seed plants, containing microspores. They are crucial for the process of fertilization.

2. **Layers of Pollen Grains**:
- Pollen grains consist of two main layers: the exine (outer layer) and the intine (inner layer).
- The exine is known for its toughness and is primarily composed of a substance called sporopollenin, which helps in the preservation of pollen grains.

3. **Composition of Intine**:
- The intine is the inner layer of the pollen grain and is generally softer than the exine.
- The primary components of the intine are polysaccharides, specifically cellulose and pectin.

4. **Analyzing the Options**:
- Option 1: Lipid and protein - Incorrect, as these are not the primary components of the intine.
- Option 2: Cellulose and pectin - Correct, as these are the main constituents of the intine.
- Option 3: Lignin and cutane - Incorrect, as these substances are not typically found in the intine.
- Option 4: Pectin and lignin - Incorrect, while pectin is correct, lignin is not a primary component of the intine.

5. **Conclusion**:
- Based on the analysis, the correct answer is that the intine of pollen grains is composed of cellulose and pectin.

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

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