EVERYDAY SCIENCE

Detailed explanation-1: -A strong, stiff nonliving layer outside the cell membrane; in plants, made of cellulose. It supports and protects the cell membrane. nucleolus. Small dark area in the nucleus where ribosomes, RNA and proteins are made.

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: -Chloroplasts are found in plant cells, but not in animal cells. The purpose of the chloroplast is to make sugars that feed the cell’s machinery. Photosynthesis is the process of a plant taking energy from the Sun and creating sugars.

Detailed explanation-4: -The cell wall is the structure that surrounds the cell membrane and gives support to the cell. The cell wall provides tensile strength as well as protection to the cell. Cell wall is a stiff and rigid structure and is present in plant cells.