Companion cells are closely associated with

(1) sieve elements

(2) vessel elements

(3) trichomes

(4) guard cells

The desert grasses, often curls their leaf to minimise water loss due to presence of 

Match the Column I and II.

        A  B  C  D
1.   1   2  3   4
2.   3   1  2   4
3.   4   1  2   3
4.   4   3  2   1

Match the following

1. A-iii, B-iv, C-i, D-ii
2. A-i, B-ii, C-iii, D-iv
3. A-iii, B-ii, C-iv, D-i
4. A-iii, B-ii, C-i, D-iv

Parenchymal cells have ________ walls and are made up of _____________.
1. Thick, cellulose
2. Thin, cellulose
3. Thick, hemicellulose
4. Thin, hemicellulose

Lignified cell wall is characteristic feature of
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. None

  _________ are commonly found in the fruit walls of nut.

Tracheids, vessels, xylem fibres and xylem parenchyma are components of
1. Simple tissue
2. Xylem
3. Sclereids
4. Pith

Dead cell without protoplasm is ___________.
1. Sclerenchyma
2. Tracheids
3. Parenchyma
4. Both A and B

In flowering plants which of the following are main water transporting element
1. Tracheids
2. Vessels
3. Both A and B
4. None of the above