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 

1. Spines

2. Palisade parenchyma

3. Bundle sheath cells

4. Bulliform cells

Match the Column I and II.

        A  B  C  D
(a)   1   2  3   4
(b)   3   1  2   4
(c)   4   1  2   3
(d)   4   3  2   1

Match the following

 A. A-iii, B-iv, C-i, D-ii

B. A-i, B-ii, C-iii, D-iv

C. A-iii, B-ii, C-iv, D-i

D. A-iii, B-ii, C-i, D-iv

Parenchymal cells have ________ walls and are made up of _____________.

Lignified cell wall is characteristic feature of

  _________ are commonly found in the fruit walls of nut.

Tracheids, vessels, xylem fibres and xylem parenchyma are components of

Dead cell without protoplasm is ___________.

In flowering plants which of the following are main water transporting element