Question

Velamen found in epiphytic roots is meant for –
A. Absorption of water from host
B. Absorption of water from air
C. Perennation
D. Protection

Answer 1

Hint: Epiphytic roots are those that grow on the surface of a plant and derives its moisture and nutrients from air, rain and water. This root system is dense and provides a large surface area.

Complete answer:
A) Absorption of water from host – water is absorbed from the host when parasitic plant is attached to the host plant eg:- cuscuta is a parasitic plant absorbs water and nutrients from the host plant on which it attaches.
B) Absorption of water from air velamen is epidermis that covers the roots of epiphytic plants such as orchids. It is capable of absorbing water (In the form of moisture) from the air.
C) Perennation – It is the survival of biennial or perennial plants from one year to back to the non – living would be heat but not as light.

The correct option is B,Absorption of water from air.

Additional Information: Velamen also serves as a mechanical function protecting the vascular tissues in the root cortex, shielding the root from transpirational water loss and in many cases adhering the plant to the substrate.

Note: Velamen is a spongy, multi-layered epidermis that consists of non-living cells which provide support and prevent water loss. It shields the root. These roots are moisture absorbing aerial roots. Orchids are an example of epiphytic plants and roots of this plant are associated with symbiotic fungi or bacteria.