define fragmentation and please distinguish it from fission and regeneration

Asked by vasundhra | 27th Dec, 2013, 09:15: PM

Expert Answer:

Regeneration

Fragmentation

Fission

Regeneration is the ability of the organisms to generate lost or damaged parts.

It occurs by the process of growth and development.

The cells from the part that has been cut off begin to divide rapidly and form a ball of cells.

The cells move to their proper places where they have to form different organs and body parts.

They then change their shapes, get specialised and start forming various tissue types.

The tissues in turn form organs and the different body parts of the living organisms.

The breaking up of body of organisms into two or more pieces or fragments on maturing, each of which subsequently can grow into a complete new organism is called fragmentation.

Fragmentation is a method of rapid multiplication that occurs naturally on its own when the parent organism matures.

During fragmentation, the parent organism undergoes accidental breakage into small pieces or fragments.

Each fragment then develops into a new individual plant.

 

Binary fission

Binary fission is the division of the parent cell.

When the organism matures, it grows in size. Its nucleus duplicates. Cytoplasm divides in the middle.

A single parent organism gives rise to two identical daughter organisms.

E.g. Amoeba, Paramoecium

 

Multiple fission

The parent cell divides to produce many identical new individuals.

E.g. Lizard, Starfish, Planaria, Hydra

E.g. Spirogyra, Oscillatoria, Hydrilla

E.g. Plasmodium

 

Answered by Sheetal Kolte | 28th Dec, 2013, 10:35: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.