'Cells are the basic structural units of living organisms'. Explain.

AcademicBiologyNCERTClass 8

A cell is the basic building block of an organism. It contains various sub-cellular organelles performing various functions required for the growth and survival of an organism. Hence, according to the cell theory, all living organisms are made up of one or more cells.

Viruses are the only living organisms that do not have cells. Non-living things do not need any such processes as they do not grow, or reproduce.

Therefore, cells are the basic structural units of living organisms.

Robert Hooke was the first person to notice cells in cork. He called them "microscopic pores." He called them "cells" because he thought they looked like the rooms in a monastery.

Cell theory came about when different scientists looked at cells through a microscope. The three scientists—Matthias Schleiden, Theodor Schwann, and Rudolf Virchow—contributed to the development of cell theory.

Here are the main ideas of cell theory:

1. The cell is all living organisms' basic structural and functional unit.

2. New cells are formed from pre-existing cells.

3. All metabolic reactions take place inside cells.

One of the ideas behind cell theories is that the cell is the building block and working unit of all living things. The main reason is that all the cellular and metabolic processes that are necessary for life happen inside the cells. This makes the cells grow, which makes the organism grow as a whole.

Tissues are made up of cells, which are the smallest parts. These tissues change and grow into organs and organ systems that do very specific things.

Updated on 10-Oct-2022 12:46:31