Question

In Orchids, the adventitious roots are
(A) Fasciculated tuberous
(B) Palmate
(C) Fibrous
(D) Both B and C

Answer 1

Hint: As a seed begins the germination process, the first parts that emerge out of the embryo are the radicle and the plumule. The plumule forms the shoot system while the radicle goes on to form the root system. Roots of most plants are usually below the ground and their function is to hold on to the parts of the plant growing above the ground. These roots draw nutrients and water from the soil and help the plant thrive. Some roots also store food. Most plants have either a taproot system or a fibrous root system.

Complete answer:
Orchid is a flowering plant that belongs to the orchid family. Orchid plants are usually found in parts of Europe, Africa, and Asia.
Adventitious roots arise from the leaf or stem of the plant and not from another root. Mainly monocot plants display this type of root system. These roots usually grow near the topsoil. Certain modifications in these roots help to store food and give plants additional support.
Fasciculated tuberous roots are adventitious roots that have undergone modifications to store food. These roots form clusters at the base of the stem. These types of roots are seen in plants like dahlia.
Palmate adventitious roots are found in Orchids, their shape resembles a palm hence the name. They have fleshy root tubers which store food or water. Fibrous roots also develop stem, however, they are more slender. They resemble fibers and are found in monocot plants, mainly plants belonging to the grass family. Plants with fibrous root system initially have a primary root but as the plant develops, the primary root degenerates.
The adventitious roots of Orchids are palmate adventitious roots.

Therefore, the correct answer is Option (B).

Note:
The taproot system (found in carrots, raddish, etc.) involves the taproot, adventitious roots and other roots that branch out from the primary root. The radicle grows to form the taproot (primary root). Dicot plants in general display this type of root system. Since adventitious roots are also present in fibrous root systems, they are sometimes called adventitious root systems.