Question

Sweet potato is modified
A)Tap root
B)Adventitious root
C)Stem 
D)Rhizome

Answer 1

Hint: Sweet potato is a dicotyledonous plant belonging to the family Convolvulaceae. The sweet potato is modified for food storage. The food stored is in the form of starch.

Complete answer:
To solve this question, we must know about the modification in plants.

The roots of the plants get modified for storage, mechanical support or any other specialised function. Several parts of the plant are modified for food storage. The food stored is in the form of carbohydrates. For example-

Modified tap root- The tap roots of carrots turnips are swollen to store food. The secondary roots developed remain thin.

Adventitious roots- The roots of the plant like sweet potato are modified to store food and water. It is known as a root tuber. The roots of sweet potato grow from any other part of the plant.

Stem- In potato, the stem is modified as a stem tuber for food storage. The potato is called a stem tuber because it consists of buds from which the leaves grow.

Rhizome-An example of rhizome is ginger. The stem is either located at the soil surface or underground.

Hence, the correct answer is option (B)

Note: Plants have three types of root.
1.Tap root- In this the main root grows larger. The secondary rootlets develop from the main root. Example carrot.
2.Fibrous root- in this the roots are like small hairs and are numerous in number. Example grass.
3.Adventitious roots- These roots develop from any other part of the plant. Example- sweet potato.