cell wall, nucleous,cytoplasm

What is a cell wall?

Plant cells, in addition to the plasma membrane, have another rigid outer covering called the cell wall. The cell wall lies outside the plasma membrane. The plant cell wall is mainly composed of cellulose. Cellulose is a complex substance and provides structural strength to plants.

What is nucleus?

Nucleus is the largest cell organelle. It is spherical in shape or oval in initial stage (also known as nucleoid). It is usually located in the centre of the cell. Important parts of nucleus are nuclear membrane and chromatin material.

What is cytoplasm?

The cytoplasm is the fluid content inside the plasma membrane. It also contains many specialised cell organelles. Each of these organelles performs a specific function for the cell.