2021 · Q24
Which one of the following statements about life processes in single-celled organisms is not correct?
general-sciencebiology-human-body
- AThey require separate organ for food uptake.
- BSeparate organ is not needed for respiration.
- CWaste of excretory material is produced by these organisms.
- DThey remain in contact with external environment.
Explanation
Single-celled organisms have no specialized organs; their entire body is one cell, so food uptake occurs directly across the cell surface and they require no separate organ for it. They carry out respiration, produce excretory waste, and remain in direct contact with the external environment through the same single cell. Hence the statement that they require a separate organ for food uptake is not correct.