Question

Which one set represents the modified tap root?
A) Daucus, sweet potato, wolffia
B) Raphanus, Beta vulgaris, Daucus
C) Sweet potato, Utricularia, Raphanus
D) Beta vulgaris, Wolffia, Daucus

Answer 1

Hint: A taproot is a large, central, and dominant root that sprouts other roots laterally. A taproot is typically somewhat straight and very thick, tapering in shape, and grows directly downward.

Complete Answer:
The root is an underground part of the plant that absorbs water and minerals from the soil and serves as a strong anchor for the plant.
Some plants' roots change shape and become modified in order to absorb and transport water and minerals from the soil to various parts of the plant. They have also been modified to provide support, food storage, and respiration.
Tap Root Modifications for Food Storage:
The absorption of food material causes the roots of some plants to become fleshy. Due to unfavourable environmental conditions, the aerial parts of these plants have worn out. When the conditions are favourable, new buds emerge from the fleshy root or from a small portion of the stem above.
Taproots of carrots and turnips, for example, swell to store food.
They are classified based on their shapes as follows:
Conical roots, such as carrots, are broad at the base and conical at the apex.
Fusiform roots, such as radish, are swollen in the middle and taper towards both ends.
Napiform roots, such as turnip, are spherical at the base and taper towards the apex.
Tuberous roots do not have a distinct shape. Sweet potatoes, for example, appear thick and fleshy.
To Improve Respiration:
Some halophytes that grow in swampy areas, such as Rhizophora, have roots that emerge from the ground and grow upwards to obtain oxygen for respiration. These plants breathe through minute pores called lenticels in their root tips.
Roots that have been nodulated:
Leguminous plant roots are transformed into root nodules that contain nitrogen-fixing bacteria such as Rhizobium. They aid in the conversion of atmospheric nitrogen into nitrates, which are then available to plants.
Raphanus sativus (radish), Beta vulgaris (beetroot), Daucus carota (carrot), and sweet potato are modified roots with tap roots. They serve as a source of reserve food. The primary root is easily distinguished in this case. Utricularia and Wolfia are rootless plants.

Therefore, the correct Answer is option (B) Raphanus, Beta vulgaris, Daucus

Note:
Dicots exhibit the taproot system. Taproots are typically deeply rooted and difficult to remove. Taproots grow in acropetal succession, which means that younger roots grow at the growing end of the taproot while older roots grow near the base of the stem.