Pectocellulosencert line in sexual reproduction in flowering plants⭐💯💯💯⭐💯⭐💯💯⭐⭐⭐💯💯⭐⭐⭐💯💯⭐⭐⭐💯💯⭐⭐⭐💯💯⭐⭐⭐⭐⭐⭐⭐💯💯💯⭐💯💯⭐💯💯💯💯⭐💯💯💯💯⭐💯💯💯💯⭐💯💯⭐💯💯💯⭐⭐⭐⭐⭐⭐⭐💯💯💯⭐💯💯⭐💯💯💯💯⭐💯💯💯💯⭐💯💯💯💯⭐💯💯⭐💯💯💯⭐

Intine of pollen grain composed of cellulose and pectin.

Explanation:
The pollen grain is the male gametophyte of the flowering plants. It consists of two layers, the outer layer called exine and the inner layer called intine. The intine is the innermost layer of the pollen grain, which surrounds the cytoplasm and the male gametes. It is composed of cellulose and pectin.

Cellulose:
Cellulose is a complex carbohydrate that is the main structural component of the cell walls of plants. It is a linear polymer of glucose molecules and provides rigidity and strength to the plant cell walls. The presence of cellulose in the intine layer of the pollen grain makes it tough and resistant to mechanical damage.

Pectin:
Pectin is a complex polysaccharide that is found in the cell walls of plants. It is a heterogeneous group of acidic polysaccharides, which are highly hydrated and gel-forming. Pectin helps to bind water molecules in the intine layer of the pollen grain, which helps to maintain the turgidity and elasticity of the cell.

Function of intine:
The intine layer of the pollen grain performs several functions, such as:

1. Protection: The intine layer protects the male gametes and the cytoplasm of the pollen grain from mechanical damage and desiccation.

2. Nutrient supply: The intine layer provides nutrients to the developing male gametes.

3. Pollen tube formation: The intine layer is responsible for the formation of the pollen tube, which is the structure that allows the male gametes to reach the female gametes in the ovary.

Conclusion:
Thus, the intine layer of the pollen grain is composed of cellulose and pectin, which provides strength, elasticity, and protection to the male gametes and helps in the fertilization process.