Sclerenchyma is

(1) dead and lignified

(2)consists of long, narrow, thick walled cells

(3)may be in the form of fibres and sclereids

(4)All of these

Which one is true for sclereids

(1)highly thickened dead walls with narrow lumen

(2)present in fruit walls of nuts

(3)pulp of guava, pear, and sapots

(4)All of the above

Sclerenchymatous fibres are

(1) thick walled, elongated and pointed cells

(2)contains simple and bordered pits

(3)smallest  cells in plant body

(4)All of these

Which one is true regarding xylem?

1. vessels are absent in gymnosperms

2. cells of vessel are called vessel members

3. tracheid and vessel lack protoplasm

4. All of these

The elements of xylem which does food storage is

(1)tracheids

(2)vessels

(3)xylem parenchyma

(4) xylem fibres

In angiosperms, the main water transporting elements are

(1)tracheids

(2)vessels

(3)Both A and B

(4)tracheids, vessels, xylem fibres, xylem parenchyma

The first formed primary xylem elements are__________and later formed is _____________

(1)protoxylem , metaxylem

(2)metaxylem , protoxylem

(3)tracheids, vessels

(4)Both B and C

The type of primary xylem when protoxylem lies towards the pith is known as

1. endarch

2. exarch

3. endoexarch

4. Both (1) and (3)

A mature sieve tube elements have

(1)large vacuole

(2)peripheral cytoplasm

(3)lack nucleus

(4)All of the above

Pressure gradient in the sieve tubes is maintained by

(1)companion cells

(2)phloem fibres

(3)phloem parenchyma

(4)All of these