Question

Define cell.

Answer 1

Cell:

1. The cell is defined as an autonomous self-replicating structure that forms the structural, functional, and biological unit of all living organisms.
2. Robert Hooke was the first biologist who discovered cells in 1665.
3. All organisms are made up of cells. Cells may be unicellular or multicellular. An organism having a single cell is known as a unicellular organism whereas an organism having many cells is known as a multicellular organism.
4. Cells are of two types namely prokaryotic and eukaryotic cells.
5. The characteristics of prokaryotic cells are nucleus is absent, reproduces asexually, is small in size i.e.1 to 10mm, is unicellular(single-celled organisms), and cell organelles are absent.
6. The characteristics of eukaryotic cells are nucleus is present, reproduces sexually as well as asexually, is large in size ranging from 5 to 100mm, and cell organelles are present.