Question

Root hair and trichomes are

• A. epidermal appendages in epidermal tissue system
• B. members of the ground tissue system
• C. members of vascular tissue system
• D. used for gaseous exchange

Answer 1

The correct option is A epidermal appendages in epidermal tissue system

Epidermal tissue system forms the outermost covering of the whole plant body. It comprises epidermal cells, stomata and epidermal appendages. Epidermal appendages include root hair and trichomes.
Root hairs are unicellular elongations of the epidermal cells that help in water and mineral absorption.
Trichomes are epidermal hairs on the stem which are multicellular. They may be branched or unbranched. They prevent water loss due to transpiration by trapping the moisture.


Stomata are used for gaseous exchange in the leaves and lenticels are present on the bark of the trees for gaseous exchange. These are small openings that are found on the plant body to facilitate transpiration and gaseous exchange.

The ground tissue system includes all the tissues except epidermis and vascular bundles. It consists of parenchyma, collenchyma and sclerenchyma.

The vascular system is formed of complex tissues such as xylem and phloem. They conduct water, minerals and food in the plant body.