Which is the incorrect statement regarding fungi ?

Options

A. Wheat rust causing agent in Puccinia
B. Penicillium is a source of antibiotic
C. The cell wall of fungi are composed of peptidoglycans
D. Fungi prefer to grow in warm and humid places

Answer

To determine the incorrect statement regarding fungi, let's analyze the provided statements one by one:

1. **Statement 1**: "We trust causing agent in Pachynaea."
- This statement refers to a fungal disease affecting crops like wheat and barley. This is correct as certain fungi are known to cause diseases in plants.

2. **Statement 2**: "Penicillin is a source of antibiotic."
- This statement is also correct. Penicillin, which is derived from the fungus Penicillium, was the first antibiotic discovered and is widely used to treat bacterial infections.

3. **Statement 3**: "The cell wall of the fungi is composed of peptidoglycan."
- This statement is incorrect. The cell walls of fungi are primarily composed of chitin, not peptidoglycan. Peptidoglycan is found in the cell walls of bacteria, not fungi.

4. **Statement 4**: "Fungi prefer to grow in warm and humid places."
- This statement is correct. Fungi thrive in warm and humid environments, which provide the necessary conditions for their growth.

Based on this analysis, the incorrect statement regarding fungi is the third one: "The cell wall of the fungi is composed of peptidoglycan."

### Final Answer:
The incorrect statement regarding fungi is: "The cell wall of the fungi is composed of peptidoglycan."