Q. No.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
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 |
The function of lenticels are
| 1. | exchange of gases |
| 2. | helps in transpiration |
| 3. | helps in vegetative reproduction |
| 4. | Both a and b |
In dicot root the complete ring of vascular bundle is formed by
(1)conjunctive tissue
(2)pericycle
(3)Endodermis
(4)Both A and B
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 B and C
There are _________types of medullary rays formed in dicot roots during secondary growth.
1. one
2. two
3. three
4. many
The common medullary rays between dicot stem and root is
| 1. | primary medullary rays |
| 2. | secondary medullary rays |
| 3. | Both A and B |
| 4. | None of the above |
Secondary growth occurs in
(1)dicot root and stem of angiosperms
(2)dicot root and stem of gymnosperms
(3)monocot roots
(4)Both 1 and 2
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