Which of the following root modifications store food?

The correct answer is Option (4) → All of these

Roots that store food become swollen. All three shapes are such storage roots:

• Conical — broad at the top and tapering below, as in the carrot.

• Napiform — nearly round at the top with a sudden taper, as in the turnip.

• Tuberous — a swollen adventitious root without a regular shape, as in the sweet potato.