Find out the incorrect statements from the followings :-

Options

A. Heterotrophic bacteria are most abundant in nature.
B. Bacterial structure is very complex and they have very simple behaviour.
C. Bacteria reproduce mainly by fission
D. Archaebacteria differ from other bacteria in having different cell wall structure.

Answer

To find the incorrect statements about bacteria, let's analyze each statement step by step:

1. **Heterotropic bacteria are most abundant in nature.**
- This statement is correct. Heterotrophic bacteria, which obtain their food from organic substances, are indeed the most abundant type of bacteria found in various environments.

2. **Heterotropic bacteria are pathogenic.**
- This statement is partially correct. While many pathogenic bacteria are heterotrophic, not all heterotrophic bacteria are pathogenic. Therefore, this statement can be considered misleading but not entirely incorrect.

3. **Bacterial structure is very complex, and they have very simple behavior.**
- This statement is incorrect. Bacteria have a relatively simple structure (prokaryotic cells) but can exhibit complex behaviors, such as forming biofilms, communicating through quorum sensing, and exhibiting various metabolic pathways.

4. **Bacteria reproduce mainly by fission.**
- This statement is correct. Bacteria primarily reproduce asexually through binary fission, which is a simple and efficient method of reproduction.

5. **Archaebacteria are different from other bacteria in having different cell wall structure.**
- This statement is correct. Archaebacteria have cell walls that do not contain peptidoglycan, which is a characteristic feature that differentiates them from eubacteria.

**Conclusion:**
The incorrect statement from the options provided is:
- "Bacterial structure is very complex, and they have very simple behavior."