Q. No.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 |
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 |
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 |
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
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 |
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
Bark refers to
| 1. | Phellem + Phellogen + Phelloderm |
| 2. | Periderm + Cortex |
| 3. | Phellem + Phelloderm + Secondary phloem |
| 4. | Periderm + Cortex + Pericycle + Secondary phloem |
The branched sclereids present in hydrophytes are:-
(1) osteosclereids
(2) trichosclereids
(3) macrosclereids
(4) astrosclereids
In the sieve elements, which one of the following is the most likely function of P-proteins?
1.
Deposition of callose on sieve plates
2.
Providing energy for active translocation
3.
Autolytic enzymes
4.
Sealing mechanism on wounding
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