All living organisms are made of self-contained units of life called cells. Some, sucha s the amoeba, consist of a single-cell, while others, such as humans, are made up of billions of cells. Each cell has a nucleus that contains the genetic material DNA, which provides the instructions the cell needs to maintain itself. Surrounding the nucleus is the cytoplasm, which contains the matter that makes the cell function. Forming a layer around the cytoplasm is the cell membrane, which forms the cell's boundary. In plant cell, there is an additional hard, rigid outer covering called Cell wall which gives plant turgidity and strength against environmental calamities.
Specialised Cells Edit
Most plants and animals consist of many cell types, each specialised to perform a specific task. Neurons are long cells that carry nerve impulses around an animals' body; guard cells are rigid box-like structures filled with fluid. They open and close pores on the surface of plant leaves.
Cell Structure Edit
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Most cells have similar structures. They consist of a fluid called cytoplasm, a surrounding cell membrane, and a nucleus. Cytoplasm contains small structures known as organelles. Plant cells, unlike animal cells, have a rough outer wall and chloroplasts.