Define and Describe on Nucleus - QS Study
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The circular dense substance suspended on protoplasm is nucleus. It controls all the physiological functions of the cell. In a newly formed cell, nucleus is located at the centre of the cell. However, in a mature cell this location may Change. Nucleus is generally circular in shape: it can be also semicircular or tubular in shag under some circumstances. Some cells have no nucleus. A nucleus is usually consists of: a) nuclear membrane, b) nucleoplasm, c) chromosome and d) nucleolus.

Nuclear membrane: This membrane surrounds the nucleus. This membrane separates cytoplasm from the nucleus and also controls the passage of material in and out of the nucleus.

Nucleoplasm: The transparent, liquid material inside the nucleus is nucleoplasm. It contains Chromosomes and nucleolus.

Nucleolus: It is the small, dense round body that remains attached with the chromatin fibre.

Chromatin fibre – The thread like coiled structure that floats in the nucleoplasm is chromatin fibre. It carries the characteristics of the organisms and passes it on the next generation. It regulates cellular growth or any other activities.