How do Organisms Reproduce? - MODES OF REPRODUCTION USED BY SINGLE7.2 MODES OF REPRODUCTION USED BY SINGLE7.2 MODES OF REPRODUCTION USED BY SINGLE7.2 MODES OF REPRODUCTION USED BY SINGLE7.2 MODES OF REPRODUCTION USED BY SINGLE

Asexual Reproduction: A mode of reproduction where a single parent produces offspring without the involvement of gamete formation or fusion. The offspring are genetically identical to the parent.

Fission: A method where a unicellular organism splits into two or more daughter cells. It is of two types: $Binary$ $Fission$ (e.g., $Amoeba$, $Leishmania$) and $Multiple$ $Fission$ (e.g., $Plasmodium$).

Binary Fission in $Leishmania$: Unlike $Amoeba$, $Leishmania$ (which causes kala-azar) has a whip-like structure at one end, and binary fission occurs in a definite orientation in relation to this structure.

Fragmentation: Multicellular organisms with relatively simple body organization, like $Spirogyra$, simply break up into smaller pieces upon maturation. These pieces or fragments grow into new individuals.

Regeneration: The ability of a fully differentiated organism to give rise to new individual organisms from its body parts. If the individual is somehow cut or broken into many pieces, many of these pieces grow into separate individuals (e.g., $Hydra$ and $Planaria$).

Budding: Organisms such as $Hydra$ use regenerative cells for reproduction in the process of budding. A bud develops as an outgrowth due to repeated cell division at one specific site.

Vegetative Propagation: A process in which new plants are obtained from the parts of old plants (like roots, stems, and leaves) without the help of any reproductive organs. Examples include $Bryophyllum$ (leaf notches) and $Money$ $Plant$ (stem).

Spore Formation: In organisms like $Rhizopus$ (bread mould), thick-walled structures called spores are produced within $sporangia$. These spores are resistant to adverse conditions and germinate into new individuals upon reaching a moist surface.