As secondary growth proceeds, in a dicot stem, the thickness of.

(1) sapwood increases

(2) heartwood increases

(3) both sapwood and heartwood increases

(4) both sapwood and heartwood remains the same

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

Tyloses are balloon-like outgrowths in the lumen of secondary xylem tracheids and vessel of duramen region. These are actually:-
(1) outgrowth of vessels of xylem

(2) ingrowth of vessels

(3) outgrowth of parenchymatous cell

(4) swelling of xylem fibres for no function

Pith cavity occurs in the stem of ?
(1) Helianthus

(2) Zea mays

(3) Cucurbita   

(4) Dracaena

Which of the following statement is true ?

1. Vessels are unicellular and with narrow lumen

2. Vessels are multicellular and with wide lumen

3. Tracheids are unicellular and with wide lumen

4. Tracheids are multicellular and with narrow lumen

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

Root cambium is derived from?

(1) primary meristem

(2) secondary meristem

(3) intercalary meristem

(4) apical meristem

Glycolate induces opening of stomata in

(1) Presence of oxygen

(2) Low ${\mathrm{CO}}_2$ concentration

(3) High ${\mathrm{CO}}_2$ concentration

(4) Absence of ${{\mathrm{CO}}_2}_{}$

Which one of the following comprises only simple tissue?

1. Parenchyma, Collenchyma and Sclerenchyma

2. Parenchyma, Xylem and Collenchyma

3. Parenchyma, Xylem and Sclerenchyma

4. Parenchyma, Xylem and Phloem

Match the following

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

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

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

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