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
Difficulty Level:
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
Difficulty Level:
The function of lenticels are
(1)exchange of gases
(2)helps in transpiration
(3)helps in vegetative reproduction
(4)Both a and b
Difficulty Level:
In dicot root the complete ring of vascular bundle is formed by
(1)conjunctive tissue
(2)pericycle
(3)Endodermis
(4)Both A and B
Difficulty Level:
In dicot root vascular cambium is _________in origin.
(1)Primary
(2)Secondary
(3)Both A and B
(4)neither primary nor secondary
Difficulty Level:
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
Difficulty Level:
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
Difficulty Level:
There are _________types of medullary rays formed in dicot roots during secondary growth.
(1)one
(2)two
(3)three
(4)many
Difficulty Level:
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
Difficulty Level:
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
Difficulty Level:
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