Question

The $3^{rd}$ and $4^{th}$ stage juveniles of root-knot nematodes are:

• A. Feeding
• B. Non-feeding
• C. Quiescent
• D. Infective

Hint:

Root-knot nematodes induce giant cell formation in roots, creating their feeding sites.

Answer 1

The Correct Option is D

Root
knot nematode life stages:
J1: Hatches from egg
J2: Infective stage (penetrates roots)
J3: Sedentary, begins feeding
J4: Develops into adult The $3^{rd}$ and $4^{th}$ stages are the infective juvenile forms that penetrate plant roots.