Q. No.The early wood has ___________ density and late wood has ____________ density.
(1)lower, higher
(2)higher, lower
(3)lower, lower
(4)higher, higher
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
Heartwood is
(1)dark brown in color
(2)contains organic compounds like tannin, resins, gums, oils
(3)known as duramen
(4)All of these
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
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
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
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
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
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