Question

Important characteristics of phytopathogenic bacteria are- A. They are saprophytes
B. They do not infect animals
C. They are invariably rod-shaped and flagellate
D. All are Gram -ve

• A. A, B and D only
• B. A, B and C only
• C. A, B, C and D
• D. B, C and D only

Hint:

Phytopathogenic bacteria = Plant specific, rod-shaped, Gram-negative, motile with flagella.

Answer 1

The Correct Option is D

Step 1: About phytopathogenic bacteria.
These are bacteria that cause diseases in plants.
They are different from human/animal pathogens.
Step 2: Key characteristics.
- B: They do not infect animals → Correct, restricted to plants.
- C: They are mostly rod-shaped and flagellate → Correct.
- D: Almost all plant pathogenic bacteria are Gram-negative → Correct.
- A: They are saprophytes → Wrong, phytopathogenic bacteria are parasitic, not saprophytic.
Step 3: Conclusion.
Thus, the important characteristics are B, C and D only.