Q. No.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 |
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
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 |
Match the Column I and II.
|
Column I |
Column II |
|
A. Bulliform cells |
1. Stomata |
|
B. Guard cells |
2. Aerating pore |
|
C. Lenticels |
3. Accessory cells |
|
D. Subsidiary cell |
4. Isobilateral cells |
A B C D
1. 1 2 3 4
2. 3 1 2 4
3. 4 1 2 3
4. 4 3 2 1
Select the correct pair amongst the following.
(1) Spring wood - light colour, high density
(2) Spring wood - dark colour, low density
(3) Autumn wood - light colour, high density
(4) Autumn wood - dark colour, high density
Root cambium is derived from?
(1) primary meristem
(2) secondary meristem
(3) intercalary meristem
(4) apical meristem
Given figure shows:-
| 1. | structure of lenticel |
| 2. | hydathode showing gaseous vapour exchange |
| 3. | fungus reproducing by spore formation |
| 4. | algae reproducing by spore formation |
Why are vascular bundles closed in monocots?
| 1. | Xylem and Phloem are present |
| 2. | Xylem and phloem occur in separate bundles |
| 3. | Vascular cambium is present between xylem and phloem |
| 4. | Vascular cambium is not present |
Bark refers to
| 1. | Phellem + Phellogen + Phelloderm |
| 2. | Periderm + Cortex |
| 3. | Phellem + Phelloderm + Secondary phloem |
| 4. | Periderm + Cortex + Pericycle + Secondary phloem |
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