Secondary growth in extra stelar region is due to
1.Phellogen
2.Cork cambium
3.Extrastelar cambium
4.All of these

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

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

The cork is impervious to ______due to __________deposition in the cell wall.
1.water, suberin
2.water, lignin
3.water, wax
4.water, cellulose

Bark non-technically refers to tissues which lies
1.exterior to vascular cambium
2.exterior to cork cambium
3.exterior to primary phloem
4.All of the above

How many of the followings constitute the bark?
( secondary phloem, secondary cortex, cork cambium, complimentary cells, epidermis, periderm )
1.6
2.5
3.4
4.3

Complimentary cells are formed by the activity of
1.phellogen
2.phellem
3.phelloderm
4. All of these

Which of the following is true for lenticels
1.lens shaped opening
2. occur in most woody trees
3.permit exchange of gases
4.All of the above