Question

A. CELLS ON THE SURFACE 1. Peel the epidermis from the lower side of a plant leaf and observe epidermal cell shape and quard cells. What to most epidermal cells look like? Why are they shaped that way? Do they contain chloroplasts? Why or why not? Also, "paint" a dab of fingernail polish on the surface of a leaf, allow to dry, peel off and observe under a microscope. Are all the stomata open or closed? Why?

Answer 1

1 . Epidermal cells are irregular in their shape . They cover and prevent the organs of the plants therefore prevent the entry of microorganisms and loss of most of the water from the plant. Epidermis do not contain chloroplast. The cells are used for protection in the plants and contains stomata in them. Stonata is open as it allows the exchange of gases in and around the plant and the environment. It is surrounded by two bean shaped gaurd cells that opens amd closes the stomata through stomata pores.

2. Trichomes in Arabidopsis thaliana serve as transpiration barrier , mediates herbivour behaviour,promotes removal of perticulates and obstructs pathogens and ultra violet light penetration. All plants do not contain trichomes in them becouse having more in one pigment allows plant to absorb more light then require making it difficult for them in functioning. All the plants do not contain same amount of trichomes it may be single in some oe in a group varing in its density.