___________ are segmented stem that grows horizontally underground.

Correct option is B

The correct answer is (b) Rhizome.
· A rhizome is a segmented stem that grows horizontally underground and is capable of producing new shoots and roots.
· Plants like ginger, turmeric, and bamboo propagate through rhizomes.
Additional Knowledge:
· Tuber: Incorrect, tubers are swollen underground stems or roots (e.g., potatoes) used for storing nutrients.
· Sucker: Incorrect, suckers are shoots that grow from the base of a plant, not underground stems.
· Bulb: Incorrect, bulbs are rounded underground storage organs consisting of layers (e.g., onions).