Read the passage and answer the following questions:
A typical microsporangium, when observed in a transverse section, has a nearly circular shape. It is typically surrounded by four layers of walls: the epidermis, endothecium, middle layers, and the tapetum. The outer three wall layers serve to protect the microsporangium and aid in the anther's opening to release the pollen. The innermost wall layer, known as the tapetum, provides nourishment to the developing pollen grains. Tapetum cells are characterized by their dense cytoplasm and often contain multiple nuclei. In angiosperms, an anther usually consists of two lobes, each with two theca, making it dithecous. The theca are often separated by a longitudinal groove. The anther itself has a tetragonal shape with four microsporangia situated at its corners, two in each lobe. These microsporangia undergo further development and transform into pollen sacs.

What is the chemical composition of intine ?

Cellulose and pectin.

The correct answer is Option (2) - Cellulose and pectin.

The intine is the inner layer of the pollen grain. It is made up of cellulose and pectin. Cellulose is a long, chain-like molecule made up of repeating glucose units. Pectin is a complex carbohydrate that is made up of sugar molecules and acids.

The intine is a thin layer that is located between the exine and the cytoplasm of the pollen grain. It is responsible for providing support and protection to the pollen grain. The intine is also involved in the germination of the pollen grain.

The intine is a very important part of the pollen grain. It provides the pollen grain with the strength and flexibility it needs to survive and germinate.