The early wood has ___________ density and late wood has ____________ density.

(1)lower, higher

(2)higher, lower

(3)lower, lower

(4)higher, higher

Subtopic:  Types of Wood |
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Which one is true for annual ring

(1) A ring of autumn wood and a ring of spring wood constitute annual ring

(2) It appears as alternate concentric ring

(3)It gives an estimate of the age of the tree.

(4)All of the above

Subtopic:  Types of Wood |
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Heartwood is

(1)dark brown in color

(2)contains organic compounds like tannin, resins, gums, oils

(3)known as duramen

(4)All of these

Subtopic:  Types of Wood |
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How many of the statements are  true for heartwood

a. It provides mechanical support to the stem

b. It does not conduct water

c. It is hard, durable and resistant to the attacks of microbes

d. It is the innermost layer of the wood

e. It comprises dead elements with highly lignified walls

f. More the heartwood is present the better is the quality of the wood

(1)4

(2)5

(3)6

(4)3

Subtopic:  Types of Wood |
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Which one is true for sapwood

(1)It lies in the peripheral region of xylem

(2)It does conduction of water and minerals

(3)It is also called as alburnum

(4)All of the above

Subtopic:  Types of Wood |
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Cork cambium gives rise

(1)cork

(2)phelloderm

(3)phellem

(4)All of the above

Subtopic:  Activity of Cork Cambium |
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Periderm comprises of

(1)Phellem

(2)phellogen

(3)phelloderm

(4)All of these

Subtopic:  Activity of Cork Cambium |
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The dead cells which are formed towards the epidermis by cork cambium are called as

(1)cork

(2)phellem

(3)phelloderm

(4)Both A and B

Subtopic:  Activity of Cork Cambium |
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The chloroplast containing parenchymatous cells which are formed towards the innerside by cork cambium are called as

(1)secondary cortex

(2)phelloderm

(3)phellem

(4)Both A and B

Subtopic:  Activity of Cork Cambium |
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Which one is true for phellogen

(1)thick layer cells

(2)narrow, thin walled and nearly rectangular cells

(3)gives rise to phellem and phelloderm

(4)All of the above

Subtopic:  Activity of Cork Cambium |
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