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 perforations
4. xylem is surrounded all around by phloem

Subtopic:  Vascular Tissue System |
 89%
From NCERT
NEET - 2015
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A major characteristic of the monocot root is the presence of:

1. Scattered vascular bundles
2. Vasculature without cambium
3. Cambium sandwiched between
phloem and xylem along the radius
4. Open vascular bundles

Subtopic:  Anatomy of Root |
 56%
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:  Anatomy of Root | Dicot Stem |
 68%
From NCERT
AIPMT - 2014
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Tracheids differ from the tracheary elements in:

1. Having casparian strips
2. Being imperforate
3. Lacking nucleus
4. Being lignified
Subtopic:  Complex Tissue: Xylem |
AIPMT - 2014
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Lenticels are involved in:

1. Gaseous exchange 2. Food transfer
3. Photosynthesis 4. Transpiration
Subtopic:  Activity of Cork Cambium |
 94%
From NCERT
AIPMT - 2013
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The common bottle cork is a product of:

1. dermatogen

2. phellogen

3. xylem

4. vascular cambium

Subtopic:  Activity of Cork Cambium |
 76%
AIPMT - 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
AIPMT - 2012
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Closed vascular bundles lack:

1. Ground tissue

2. Conjuctive tissue

3. Cambium

4. Pith

Subtopic:  Vascular Tissue System |
 90%
From NCERT
AIPMT - 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 |
 68%
AIPMT - 2012
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Gymnosperms are also called softwood spermatophytes because they lack:

1. Cambium

2. Phloem fibres

3. Thick-walled tracheids

4. Xylem fibres

Subtopic:  Complex Tissue: Xylem |
AIPMT - 2012
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