Question

A fish, unlike a spirogyra, cannot reproduce through fragmentation process. The possible reason for inability of fish is:

• A. Complexity in body design
• B. Specialised cells are involved in fragmentation process
• C. Cells and tissues are well differentiated
• D. Unfavourable conditions like temperature

Answer 1

Answer: (A), (B), (C)

The correct options are
A Complexity in body design
B Specialised cells are involved in fragmentation process
C Cells and tissues are well differentiated

Multicellular organisms cannot simply divide cell-by-cell. The reason is that many multi-cellular organisms, as we have seen, are not simply a random collection of cells. Specialised cells are organised as tissues, and tissues are organised into organs, which then have to be placed at definite positions in the body. In such a carefully organised situation, cell-by-cell division would be impractical.