Question

write short note on nucleus....​

Answer 1

ANSWER

The nucleus is small, round and membrane bound structure found in cell. The fluid inside the nucleus surrounded by nuclear membrane is called nucleoplasm. It controls the cell's growth and reproduction because it contains cell's hereditary information.

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Answer 2

Nucleus was first observed by Leeuwenhoek in the RBCs of fishes.

The term 'Nucleus' was coined by Robert Brown in 1831.

Nucleus is a double membrane bound dense protoplasmic body.

It encloses the genetic information of the cell which means that the genetic material (DNA or RNA) is present in it.

It is absent in prokaryotes and mature RBCs in case of eukaryotes.

Depending upon the number of nucleus, a cell may be uninucleate, binucleate or multinucleate.

The shape of nucleus may be discoid, ovoid, spherical, bilobed or multilobed.

The outermost double layered covering of nucleus is called nuclear membrane or karyotheca or nuclear envelope.

The nuclear envelop consists of many pores called nuclear pores.

The nucleus is filled with nucleoplasm which contains chromatin i.e. thread like structures of DNA.

Within the nucleus is present nucleolus which is a spherical body seen during interphase.

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