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

Cork cambium gives rise

(1)cork

(2)phelloderm

(3)phellem

(4)All of the above

Periderm comprises of

(1)Phellem

(2)phellogen

(3)phelloderm

(4)All of these

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

Incorrect match is

(1)Phellogen  = cork cambium

(2)Phellem = Cork

(3)Phelloderm=cortex

(4)Phelloderm=Secondary cortex

In plants the replacement of the outer cortical and epidermal layers when they are broken are because of the

(1)Cork cambium

(2)vascular cambium

(3)Phellogen

(4)Both A and C

The cork is impervious to ______due to __________deposition in the cell wall.

(1)water, suberin

(2)water, lignin

(3)water, wax

(4)water, cellulose