The companion cells help in maintaining the ________ in the sieve tube.
1. Temperature gradient
2. Cellulose gradient
3. Pressure gradient
4. Ion gradient

Resin, latex and mucilage are found in

Phloem parenchyma is absent in most of the
1. Dicotyledons
2. Monocotyledon
3. Desert plants
4. None of the above

Phloem fibres are made up of

Which component of Jute, Flax and Hemp are commonly used?

Epidermis in plant is generally

Epidermal cells are parenchymatous with __________ amount of cytoplasm lining, the cell wall and _______ vacuole.

A waxy thick layer which prevent water loss is

Cuticle is not found in

Opening and closing of stomata is a function of