The cork cambium, cork and secondary cortex are collectively called

1. phellogen

2. periderm

3. phellem   

4. phelloderm

Subtopic:  Activity of Cork Cambium |
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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 |
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Which one of the following is not a lateral meristem?

1. Cork cambium

2. Interfascicular cambium

3. Phellogen

4. Intercalary meristem

Subtopic:  Meristematic Tissue:Classification |
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Heartwood differs from sapwood in 

1. presence of rays and fibres

2. absence of vessels and parenchyma

3. having dead and non-conducting elements

4. being susceptible to pests and pathogens

Subtopic:  Types of Wood |
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The annular and spirally thickened conducting elements generally develop in the

protoxylem when the root or stem is

1. maturing

2. elongating

3. widening

4. differentiating

Subtopic:  Dicot Stem |
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In barley stem, vascular bundles are

(1) open and scattered

(2) closed and scattered

(3) open and in a ring

(4) closed and radial

Subtopic:  Monocot Stem |
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Guard cells help in ?

1. protection against grazing

2. transpiration

3. guttation

4. fighting against infection

Subtopic:  Epidermal Tissue System |
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Palisade parenchyma is absent in leaves of :-

1. Sorghum

2. mustard

3. soybean

4. gram

Subtopic:  Monocot Leaf |
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Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of

1. xerophytes

2. mesophytes

3. epiphytes

4. hydrophytes

Subtopic:  Tissue: Intro & Classification |
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Vascular tissues in flowering plants develop from

(1) phellogen

(2) plerome

(3) periblem

(4) dermatogen

Subtopic:  Activity of Cork Cambium |
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