Question

Why is cell know a self-contained unit or an autonomous body

Answer 1

Answer:

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Explanation:

Each cell, whether of unicellular or multicellular organisms, acts as an autonomous unit i.e. able to carry out activities independent for its own survivalist.

This can be justified from following fact

1.Each cell obtains food, oxidize them to produce energy and store this energy in the form of Atp

2. Each cell can respire and exchange gases with its surrounding.

3.Each cell synthesize the own macromolecules from macromolecules.

5. Metabolic wastes are discarded by each through its own mechanism.

6. Each cell may undergo division, producing identical daughter cells.

7. Each cell can maintain homeostasis.

8. Cells regulate their activity through (i) flow of energy and (ii) flow of information.

9. The whole genetic information is contained in a cell and can be made to grow into a fully develop and organism (a phenomenon called totipotency).

10. Each cell has its own life span. A cell may grow, divide and die while its surrounding cells may be in a different state.

Cellular Autonomy in Unicellular Organism:

A cell of a unicellular (single celled) organism has absolute independent existence. It does not depend upon any other cell for any function, material or information. Except for sexual reproduction, all activities are carried out by the same cell.

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4. With the help of its lysosomes, each cell discards it’s worn out components.

Answer 2

Cell is know a self-contained unit or an autonomous body because:

• Even though the functions of cells are integral for the survival of organisms, each and every cell is capable of independent existence and acts as an autonomous unit.
• Each cell is rightly capable to carry out the fundamental biological processes.
• Cells are capable of dividing and producing further daughter cells with similar hereditary material.
• In unicellular organisms the cell depends on its own intrinsic information and responds to the surrounding with which it is in direct contact. All the activities are carried out by the same cell.
• In multicellular organisms, the cells do not lead to a totally autonomous existence. They cooperate and interact and exhibit division of labor. Due to this division, they become specialized to carry out different functions like protection in epidermal cells, contraction in muscle cells or conducting stimulus in a nerve cell.

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