Which plant is commonly propagated using a tuberous root?

• A. Carrot
• B. Potato
• C. Sweet potato
• D. Onion

Answer: (C)

Storage organs used for vegetative propagation are a key idea here. A tuberous root is a thickened root that stores nutrients, and some plants use this root to generate new plants. The sweet potato has such a storage root, and gardeners propagate it by producing slips—shoot cuttings from the storage root—that root and grow into new plants. The other options don’t use a tuberous root for propagation: the carrot is a taproot, not a tuberous root; the potato is a stem tuber formed from underground stems, not a tuberous root; and onions form bulbs from leaves. So the plant commonly propagated using a tuberous root is the sweet potato.