Question

A segment of nematode species differing from the rest of the species in some physiological characteristic such as pathogenicity is called:

• A. Biotype
• B. Pathotype
• C. Race
• D. Pathovar

Hint:

Nematode biotypes can develop resistance to host plants, making management challenging.

Answer 1

The Correct Option is A

Step 1: Fungi use "race" and bacteria use "pathovar" for physiologically distinct but morphologically similar populations.
Step 2: "Pathotype" is a broader, less specific term not tied to nematodes in particular.
Step 3: For nematodes, the accepted term for such a physiologically distinct segment is biotype.
\[ \boxed{\text{Biotype}} \]