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

Subtopic:  Vascular Tissue System |
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Given figure shows:-

(a) structure of lenticel
(b) hydathode showing gaseous vapour exchange
(c) fungus reproducing by spore formation
(d) algae reproducing by spore formation

Subtopic:  Activity of Cork Cambium |
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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

Subtopic:  Types of Wood |
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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

Subtopic:  Types of Wood |
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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

Subtopic:  Monocot Leaf |
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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

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

(2) Zea mays

(3) Cucurbita   

(4) Dracaena

Subtopic:  Monocot Stem |
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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
(a)   1   2  3   4
(b)   3   1  2   4
(c)   4   1  2   3
(d)   4   3  2   1

Subtopic:  Epidermal Tissue System | Monocot Leaf | Activity of Cork Cambium |
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Root cambium is derived from?

(1) primary meristem

(2) secondary meristem

(3) intercalary meristem

(4) apical meristem

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Which one of the following comprises only simple tissue?

A. Parenchyma, Collenchyma and Sclerenchyma

B. Parenchyma, Xylem and Collenchyma

C. Parenchyma, Xylem and Sclerenchyma

D. Parenchyma, Xylem and Phloem

Subtopic:  Tissue: Introduction & Classification |
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