Which one is true of collenchyma?

(1)forms the hypodermis of dicot stem

(2) present below epidermis in layers or patches

(3)thickened corners due to cellulose, hemicellulose, and pectin deposition

(4)All of the above

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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The main mechanical tissue of the plant is

(1)sclerenchyma

(2)collenchyma

(3)parenchyma

(4)Both B and C

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Sclerenchyma is

(1) dead and lignified

(2)consists of long, narrow, thick walled cells

(3)may be in the form of fibres and sclereids

(4)All of these

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Which one is true for sclereids

(1)highly thickened dead walls with narrow lumen

(2)present in fruit walls of nuts

(3)pulp of guava, pear, and sapots

(4)All of the above

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Sclerenchymatous fibres are

(1) thick walled, elongated and pointed cells

(2)contains simple and bordered pits

(3)smallest  cells in plant body

(4)All of these

Subtopic:  Simple Tissue: Chollenchyma & Sclerenchyma |
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Which one is true regarding xylem?

1. vessels are absent in gymnosperms

2. cells of vessel are called vessel members

3. tracheid and vessel lack protoplasm

4. All of these

Subtopic:  Complex Tissue: Xylem |
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The elements of xylem which does food storage is

(1)tracheids

(2)vessels

(3)xylem parenchyma

(4) xylem fibres

Subtopic:  Complex Tissue: Xylem |
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In angiosperms, the main water transporting elements are

(1)tracheids

(2)vessels

(3)Both A and B

(4)tracheids, vessels, xylem fibres, xylem parenchyma

Subtopic:  Complex Tissue: Xylem |
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The first formed primary xylem elements are__________and later formed is _____________

(1)protoxylem , metaxylem

(2)metaxylem , protoxylem

(3)tracheids, vessels

(4)Both B and C

Subtopic:  Complex Tissue: Xylem |
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The type of primary xylem when protoxylem lies towards the pith is known as

1. endarch

2. exarch

3. endoexarch

4. Both (1) and (3)

Subtopic:  Complex Tissue: Xylem |
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