LIFE SCIENCE

Detailed explanation-1: -The cell wall is an additional protective layer in the cells of the plant. It is a tough, rigid structure made up chiefly of cellulose, pectin, and hemicellulose. The cell wall of plants is comprised of one or two layers. The first layer is called the primary cell wall.

Detailed explanation-2: -The organelles found only in plant cells include chloroplast, cell wall and a vacuole. The chloroplasts contain a green pigment chlorophyll that is responsible for the process of photosynthesis. Plant cells are rigid and have a hexagonal shape because of the presence of cell wall.

Detailed explanation-3: -Secondary cell walls contain additional components, such as lignin, which is hard and occupies the interstices between the other components, making the walls rigid and permanent.

Detailed explanation-4: -A cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell. The cell wall contains not only cellulose and protein, but other polysaccharides a s well . The cell wall provides structural support and protection.