It is tapering in shape and grows directly downward. Fusiform root is widest in the middle and tapers towards the top and the bottom. Napiform type of storage root has a top-like appearance. It is very broad at the top and tapers suddenly like a tail at the bottom.

Napiform: A little-used but useful adjective meaning turnip-shaped. “A napiform root is one when much swollen at the base, so as to become broader than long, as that of the turnip.” (The Complete Herbalist by Dr. O.

The root transports water and minerals from soil to other parts of the plant, and in some plants like turnip and carrot is modified to store food.

– Napiform roots are the modifications of taproot which become swollen and spherical at the upper end while their lower end is tapered like a thread. Some examples of napiform roots are- turnip (Brassica rapa), sugar beet. – Taproot- It is the central and dominant root.

Conical root: this type of root tuber is conical in shape, i.e. widest at the top and tapering steadily towards the bottom: e.g. carrot. Napiform root: the root has a top-like appearance. It is very broad at the top and tapers suddenly like a tail at the bottom: e.g. turnip.

– Napiform roots: These roots are globular or spherical in structure. It is very broad at the top and the bottom. e.g., Turnip.

Assimilatory roots are type of modified root. These roots grow chlorophyll and turn into photosynthesis. They synthesize carbon dioxide, water and carbohydrates in the presence of sunlight. Examples: Tinospora, podostemon and Taeniphyllum.

– Napiform roots: These roots are globular or spherical in structure. It is very broad at the top and the bottom. – Conical roots: In this root tuber is in conical shape i.e. wider at the top and tapering towards the bottom. e.g., Carrot.

Fusiform root is the modification of tap root for food storage. The fusiform root is swollen in the middle and tapering towards both ends forming spindle shaped structure. e.g. Radish (Raphanus sativus).

So, what types of roots are assimilatory roots. Well, these are modified adventitious roots, which when exposed to the sun, turn green and photosynthetic in function. They appear like green threads hanging from the plant. These can be found in terrestrial plants, aquatic plants and epiphytes like orchids.

Tinospora has climbing photosynthetic roots which are aerial. In Trapa, roots are underwater and called as hydrophytes. In epiphytes, like Taeniophyllum the roots are flat ribbon-like green velamen roots.

Option (D)Fusiform root: Radish is an example of a fusiform tap root. The edible part of radish may be a modified tap root. During a plant with a taproot system, the taproot is the central and dominant root. There are several types of modified tap roots like fusiform, napiform, conical, tuberous roots.