The shape of the vascular bundle is __________in the beginning and later it becomes ___________in dicot root.
1.wavy, circular
2.circular, wavy
3.circular , rectangular
4.wavy, and trapezoid

In dicot roots, secondary phloem is formed towards the _________ and secondary xylem is formed towards the __________ by the activity of vascular cambium.
1.periphery, centre
2.centre, periphery
3.innerside, outerside
4.Both 2 and 3

The function of lenticels are

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

Complimentary cells are formed by the activity of

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

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

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

Incorrect match is

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