Cell – The Basic Unit Of Life.Done ByG.SRI HARSHA [ IX Grade]

What Is A Cell????

Cell is the structural and functional unit of life.

Cell is a Latin word for ‘ A Little Room’.Cell may seem to be very small and Insignificant incident but it is very important in the History of Science.

Robert Hooke- The first Person to see and identify cork cells.

Structure And Function Of Any Two Organelles.

NucleusThe Nucleus is the largest organelle in a cell.It contains a dense structure called the nucleolus and is surrounded by the Nuclear Envelope, A structure composed of two membranes,seperated by fluid,which contain a number of nuclear pores that can allow relatively large molecules through.The nucleus contains nearly all of the cells genetic material.The nucleolus creates Ribonucleic acid and Ribosomes.

Structure of Nucleus

The Endoplasmic Reticulum (ER) is found near the Nucleus and is made up of a number of flattened sacs called Cisternae, which are continuous with the Nuclear Envelope. The Rough Endoplasmic Reticulum is called so because it has a lot of Ribosomes on its outer surface. The Smooth Endoplasmic Reticulum however, does not have Ribosomes. The Rough transports proteins that are synthesised in the Ribosomes, and the Smooth synthesises Lipids.

Endoplasmic Reticulum [ER]

Rough And Smooth Endoplasmic Reticulum.

Animal And Plant Cell

Plant and animal cells have several differences and similarities. For example, animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are round and irregular in shape while plant cells have fixed, rectangular shapes.

Plant and animal cells are both eukaryotic cells, so they have several features in common, such as the presence of a cell membrane, and cell organelles, like the nucleus, mitochondria and endoplasmic reticulum.

Animal And Plant Cell