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

Which of the following is true for  trichomes

1. usually multicellular

2. may be branched or unbranched

3. prevent transpirational water loss

4. All of the above

Which one is incorrect  statement

(1)subsidiary cells are specialised epidermal cells

(2)cuticle is always present on epidermal tissue system

(3)cuticle is absent in roots

(4)Guard cells surround the stoma