Pressure gradient in the sieve tubes is maintained by

(1)companion cells

(2)phloem fibres

(3)phloem parenchyma

(4)All of these

Which of the following is true for phloem parenchyma?

(1)made up of elongated, tapering cylindrical cells

(2)have dense cytoplasm and nucleus

(3)stores food material and resins, latex and mucilage

(4)All of the above

Which element of the phloem becomes dead at maturity

(1)sieve tube elements

(2)companion cells

(3)phloem parenchyma

(4)phloem fibres

Metaphloem contains _________sieve tubes while protophloem contains____________ sieve tubes.

(1)bigger, narrow

(2)narrow, bigger

(3)narrow, no

(4)no, bigger

Epidermal tissue system consists of

(1)epidermal cells

(2)stomata

(3)trichomes, root hairs

(4)All of the above

Which one is true regarding epidermis?

(1)usually single layered

(2)made up of parenchymatous cells

(3)outermost layer of the primary plant body

(4)All of the above

Stomata is a part of which type of tissue system

1. Epidermal tissue system

2. Ground tissue system

3. Vascular tissue system

4. Both 1 and 2

Stomatal apparatus comprises of

(1)stomatal aperture, guard cells

(2)stomatal aperture, guard and subsidiary cells

(3)stomatal aperture and guard, subsidiary and epidermal cells

(4)stomatal aperture and subsidiary cells

In grasses, ____________cells are dumb-bell shaped

(1)subsidiary cells

(2)guard cells

(3)Both A and B

(4)stomatal apparatus

The epidermal hairs of root are usually   _________while of shoots are usually________

(1)unicellular, multicellular

(2)multicellular, unicellular

(3)multicellular, multicellular

(4)unicellular, unicellular