Vascular bundles in monocotyledons are considered closed because

1. a bundle sheath surrounds each bundle
2. cambium is absent
3. there are no vessels with performations
4. xylem is surrounded all around by phloem

Subtopic:  Vascular Tissue System |
 89%
From NCERT
NEET - 2015
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You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
1. Secondary xylem
2. Secondary phloem
3. Protoxylem
4. Cortical cells

Subtopic:  Complex Tissue: Xylem |
 64%
From NCERT
NEET - 2014
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Interfascicular cambium develops from the cells of ?

1. medullary rays

2. xylem parenchyma

3. endodermis

4. pericycle

 74%
From NCERT
NEET - 2013
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The common bottle cork is a product of

(1) Dermatogens

(2) phellogen

(3) xylem

(4) vascular cambium

Subtopic:  Activity of Cork Cambium |
 75%
NEET - 2012
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Companion cells are closely associated with

(1) sieve elements

(2) vessel elements

(3) trichomes

(4) guard cells

Subtopic:  Complex Tissue: Phloem |
 93%
From NCERT
NEET - 2012
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Closed vascular bundles lack

1. ground tissue

2. conjunctive tissue

3. cambium

4. pith

Subtopic:  Vascular Tissue System |
 89%
From NCERT
NEET - 2012
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Water containing cavities in vascular bundles are found in

1. sunflower
2. maize
3. Cycas
4. Pinus

Subtopic:  Monocot Stem |
 62%
NEET - 2012
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Ground tissues includes

1. All tissues except epidermis and vascular bundles
2. Epidermis and cortex
3. All tissues internal to endodermis
4. All tissues external to endodermis
Subtopic:  Epidermal Tissue System |
 87%
From NCERT
NEET - 2011
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In land plants, the guard cells differ from other epidermal cells in having:-

1. mitochondria

2. endoplasmic reticulum

3. chloroplasts

4. cytoskeleton

Subtopic:  Epidermal Tissue System |
 80%
NEET - 2011
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The cork cambium, cork and secondary cortex are collectively called

1. phellogen

2. periderm

3. phellem   

4. phelloderm

Subtopic:  Activity of Cork Cambium |
 75%
From NCERT
NEET - 2011
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