Question

Roots play an insignificant role in the absorption of water in the case of
A. Triticum
B. Helianthus
C. Pistia
D. Pisum

Answer 1

The roots are the organs of a plant that are modified to give a system for the plant and take in water and nutrients into the body of the plants. This phenomenon helps the plants to grow taller and faster. The roots lie below the surface of the soil but the roots can be aerial also.

Complete step by step answer:
The roots help in absorption of water in the body of the plants such as Triticum, Helianthus, and Pisum as they are present below the soil and helps in the uptake of nutrients as well as water. The roots of the plants are very important as it helps in the supply of nutrients to the whole plant which helps in the growth and development of the plants. But there are aerial roots also present in some plants which help in the support and other purposes to the plants.
The roots also play an insignificant role in the absorption of water in the case of Pistia as it is a genus of aquatic plant that belongs to the family Araceae. It is a perennial monocotyledon with soft, thick leaves that are formed from a rosette. These plants float on the water surface as they are light in weight and their roots hanging submerged beneath floating leaves. Pistia plant is hydrophyte where the absorption of water by the roots is insignificant.
Hence, the correct option is C, i.e.,Pistia

Note: The flowers of Pistia plant are light green, with wavy margins, parallel veins which are covered in short hairs which form a basket-like structure that traps air bubbles and increases the buoyancy of the plants. The plant also goes under asexual reproduction as mother and daughter plants are connected by stolon.