A mature sieve tube elements have
1.large vacuole
2.peripheral cytoplasm
3.lack nucleus
4.All of the above

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

Phloem fibres are
1.also known as bast fibres
2.made up of sclerenchymatous cells
3.absent in primary phloem
4.All of these

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

In grasses, ____________cells are dumb-bell shaped
1.subsidiary cells
2.guard cells
3.Both 1 and 2
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