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

Subtopic:  Complex Tissue: Phloem |
AIIMS - 2006
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Bark refers to 

(1) Phellem + Phellogen + Phelloderm

(2) Periderm + Cortex

(3) Phellem + Phelloderm + Secondary phloem

(4) Periderm + Cortex + Pericycle + Secondary phloem

Subtopic:  Activity of Cork Cambium |
 51%
AIIMS - 2009
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The branched sclereids present in hydrophytes are:-
(1) osteosclereids

(2) trichosclereids

(3) macrosclereids

(4) astrosclereids

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
AIIMS - 2009
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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 |
 89%
From NCERT
AIIMS - 2010
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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 |
 90%
From NCERT
AIIMS - 2011
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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 (OLD NCERT) |
 80%
From NCERT
AIIMS - 2013
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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 (OLD NCERT) |
AIIMS - 2016
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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 |
 88%
From NCERT
AIIMS - 2017
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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

 58%
AIIMS - 2016
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Pith cavity occurs in the stem of ?
(1) Helianthus

(2) Zea mays

(3) Cucurbita   

(4) Dracaena

Subtopic:  Monocot Stem |
AIIMS - 2015
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