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

Step 1: J1 develops and moults inside the egg.
Step 2: J2 hatches and actively penetrates the host root, starting the parasitic phase.
Step 3: J3 and J4 continue that parasitic engagement with the root rather than becoming dormant.
Step 4: The correct option is Infective.