Write short note on the following?(a) …

Cytoplasm

Cytoplasm is a thick jelly-like fluid inside the cell membrane. Nearly 80% of the cytoplasm is water. It occupies the space between the cell membrane and the nucleus. All the life functions take place in the cytoplasm. There are many small cytoplasmic bodies in cytoplasm. These are called cell Organelles. All organelles in cytoplasm play an active role in the functioning of the cell.

Nucleus

Nucleus is a large, spherical organelle present in all the cells. 1)In animal cells, nucleus lies in the centre of the cell whereas in plant cells the nucleus may be on the periphery of the cell. 2)Nucleus is the largest organelle in a cell. 3)It can be stained and seen easily with the help of a microscope. 4)Nucleus is separated from the cytoplasm by a membrane called nuclear membrane. 5)The transmission of characteristics from the parents to the offsprings is called inheritance.Nucleus contains thread like structures called chromosomes 6)Chromosomes contain genes.The function of chromosomes is to transfer the characteristics from the parents to the offspring through the genes.The nucleus also contains a tiny round structure called nucleolus.

(a) Cytoplasm: It is a fluid that fills the cell and occurs between the plasma membrane and the nucleus. Cell organelles such as mitochondria, ribosomes, Golgi bodies, etc. are suspended in the cytoplasm. The cytoplasm helps in the exchange of materials between cell organelles.

(b) Nucleus of a cell: Nucleus is the master of the cell. It commands all the functioning of the cell. It is generally located in the center of the cell and is spherical in shape. A membrane called nuclear membrane separates it from cytoplasm. It contains the genetic material DNA and RNA in it. This porous membrane allows the transfer of material in the nucleus and cytoplasm. Nucleus contains a dense body called Nucleolus which actually contains chromosomes, the genetic material.