Question

Underground stem that has contractile roots is

• A. Rhizome
• B. Corm
• C. Stem tuber
• D. Bulb

Answer 1

The correct option is B Corm

The meanings of the following stem modifications are:

-Rhizome: It is a fleshy and horizontal stem found under the soil. Small nodes and internodes are found which are covered with scaly leaves. Ex- Ginger, Turmeric, Canna, Water lily and Banana.

-Corm: It is a condensed structure which grows vertically under the soil surface. They possess spherical node and internode and they possess contractile roots. Ex- Colocasia, Alocasia, Zaminkand, etc.

-Stem tuber: The tip of underground branches become swollen in the soil. Eyes are found on them which are axillary buds and they are covered with scaly leaves. Ex- Potato.

-Bulb: The stem is reduced and has a disc-like structure which surrounds with numerous fleshy scaly leaves. Many roots arise from its base. Food is stored in their fleshy leaves. They show apical growth. Ex- Onion and Garlic.

So, the correct answer is 'Option B- Corm'.