The cork cambium, cork and secondary cortex are collectively called:
1.  phellogen
2.  periderm
3.  phellem
4.  phelloderm

Subtopic:  Activity of Cork Cambium |
 83%
From NCERT
AIPMT - 2011
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The chief water conducting elements of xylem in gymnosperms are:

1. vessels

2. fibres

3. transfusion tissue

4. tracheids

Subtopic:  Complex Tissue: Xylem |
 65%
From NCERT
AIPMT - 2010
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Anatomically, fairly old dicotyledonous root is distinguished from the dicotyledonous stem by:

1. absence of secondary xylem

2. absence of secondary phloem

3. presence of cortex

4. position of protoxylem

Subtopic:  Anatomy of Root | Dicot Stem |
 77%
From NCERT
AIPMT - 2009
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Guard cells help in:
1. protection against grazing
2. transpiration
3. guttation
4. fighting against infection

Subtopic:  Epidermal Tissue System |
 88%
From NCERT
AIPMT - 2009
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Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following :

1. Tyloses in vessels

2. Closure of stomata 

3. Flaccidity of bulliform cells

4. Shrinkage of air spaces in spongy mesophyll

Subtopic:  Monocot Leaf |
 81%
From NCERT
NEET - 2019
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Phloem in gymnosperms lacks:

1. Both sieve tubes and companion cells 

2. Albuminous cells and sieve cells

3. Sieve tubes only

4. Companion cells only

Subtopic:  Complex Tissue: Phloem |
 81%
From NCERT
NEET - 2019
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Closed vascular bundles lack:

1. Ground tissue

2. Conjuctive tissue

3. Cambium

4. Pith

Subtopic:  Vascular Tissue System |
 89%
From NCERT
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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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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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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