Colocasia is a

Turmeric powder is obtained from which part of the plant?

Provide definitions/explanations for the following terms:
$(i)$ Spine
$(ii)$ Bulb

$A$ non-green stem branch that grows obliquely or sometimes grows horizontally inside the soil and then comes out of the soil as a leafy shoot is called:

Describe the modifications of the stem for protection.

$A$ sucker,which is a subaerial stem modification for vegetative propagation,is seen in: