Question

Which of the following plants shows both stem and root modifications for storage?

• A. Carrot, Turnip
• B. Potato, Ginger
• C. Sweet potato, Colocasia
• D. Sweet potato, Potato

Hint:

Distinguish stem and root modifications by their origin: stems have nodes and buds, roots do not. This helps identify storage organs correctly.

Answer 1

The Correct Option is C

Step 1: Understand stem and root modifications for storage 
Stem modifications for storage include tubers (e.g., potato), rhizomes (e.g., ginger), bulbs, and corms. 
Root modifications for storage include tuberous roots and fleshy roots (e.g., carrot, sweet potato).
Step 2: Identify stem and root modifications in each pair 
(1) Carrot, Turnip: Both are root modifications (tuberous roots), no stem modification. 
(2) Potato, Ginger: Both are stem modifications (potato is stem tuber, ginger is rhizome), no root modification. 
(3) Sweet potato, Colocasia: Sweet potato has tuberous root (root modification) and Colocasia has corm (stem modification). 
(4) Sweet potato, Potato: Sweet potato (root modification), Potato (stem modification). 
Step 3: Check which pair has both stem and root modifications 
Pair (3) and (4) show both stem and root modifications. 
However, Colocasia's storage organ is a corm (a modified stem), making (3) the best example of both types. 
Sweet potato and Potato (4) also fit, but Colocasia is a clearer example of stem modification as a corm, while Potato is a tuber. 
Conclusion: The pair Sweet potato and Colocasia shows both root and stem modifications for storage.