In the establishment of rhizobia in a legume, infection threads are found in the:

A) stele.
B) cortex.
C) root hairs.
D) xylem.
E) phloem.

Infection Threads

Filamentous structures formed by certain bacteria during the infection process of plant roots, facilitating microbial entry.

Legume

(1) A simple, dry fruit that develops from a single carpel and splits open at maturity along two sutures to release seeds. (2) Any member of the pea family (e.g., pea, bean, peanut, alfalfa).