How are the modes for reproduction different in unicellular and multicellular organisms?
The modes for reproduction in unicellular oganisms are:
(i) Binary fission: In this the parent undergoes a simple division into two daughters of equal size. It consists of division of the nucleus followed by cleavage of cytoplasm into equal parts, each having a daughter nucleus. Beg- amoeba.
(ii) Multiple fission: Tthe parent divides into many daughter cells simultaneously. eg in plasmodium.
The modes of reproduction in multicellular organisms are:
(i) Regeneration: The organism gives rise to new individual organisms from cut or broken body parts. eg in Hydra.
(ii) Fragmentation: The mature Spirogyra (an alga) breaks into two or more pieces (fragments). Each fragment grows into new individual. The process is called Fragmentation.
(iii) Sexual Reproduction: This is the mode which involves male and female gametes which fuse to from the zygote.
