NEET BIOLOGY

Detailed explanation-1: -In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls allow plants to have rigid structures as varied as wood trunks and supple leaves; and vacuoles allow plant cells to change size.

Detailed explanation-2: -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-3: -Cells of bacteria, fungi, algae, and higher plants are surrounded by rigid cell walls, which are an integral part of the cell. Although not encased in cell walls, animal cells in tissues are closely associated with an extracellular matrix composed of proteins and polysaccharides.

Detailed explanation-4: -Cell walls are the rigid outer covering layer of the plant cell. It is made up of cellulose and polysaccharides that makes it tough and gives rigidity to plant cells. This is the reason that plant cells remain more rigid than animal cells.