Question

Clinging roots occur in
A. Trapa
B. Orchid
C. Screwpine
D. Podostemon

Answer 1

Hint: Roots of epiphyte plants are known as clinging root, such epiphyte plant have ability two grow on the other part (bark) of the large plants, these are the adaptive feature and such plant are found in tropical evergreen forest where competition so to get the required amount of sunlight.

Complete answer:
Clinging roots are the variant of adventitious roots, they grow from the axil of leaf or node of the stem. Orchids are the plants which have clinging type of roots, such absorber the nutrient and water form fallen leaf on plant part or may epiphyte plant act as parasite using their root to get their nutrition from the host plant. Clinging roots are penetrated into the crevices of the plant and attached to it.
A. Trapa is a plant which belongs to family Trapaceae that is small herb and hold medicinal properties, it is aquatic in nature and found in tropical countries like India, China, Nepal, as it hold medicinal property than it is used in various ayurvedic and unani medicine to various kind organ related disease. Root of this plant is large scale roots which are green in color that possess chlorophyll and show photosynthetic activity.
C. Screwpine:- This Plant family bear stilt root. Stilt roots are known as brace root, they are usually adventitious obliquely growing roots which arise from the lower nodes of the stem part of the plant which provide additional support to the plant.
D. Podostemon:- It is the genus of plant Podostemaceae family, which is aquatic in nature and angiospermic plant, which bear an adventitious root system, in which numbers of root arise from the bottom of the plant no main branch is shown.

So, the correct answer is option B.

Note: Clinging roots are different from climbing root(adventitious root), Clinging root are the modified version of adventitious root which, possess some specialized tissue known as velamen tissue which help in to get the moisture from the air to meet required amount of water to the plant.