Plant Anatomy (Structural Organisation)
1. Consider the following
In spring season vascular cambium
i. is less active
ii. produces a large number of
iii. forms vessels with wide
cavities of these,
(i) is correct but (ii) and (iii) are not correct
b. (i) is not correct but (ii) and
(iii) are correct
(i) and (ii) are correct but (iii) is not correct
(i) and (ii) are not correct but (iii) is correct.
2. Usually, the monocotyledons do
not increase their girth, because
They possess actively dividing cambium
b. They do not possess actively
Ceases activity of cambium
All are correct
3. In the diagram of lenticel
identify the parts marked as A,B,C,D
a. A. phellem, B. Complementary
tissue, C. Phelloderm, D. Phellogen.
A. Complementary tissue, B. Phellem, C. Phellogen, D.Phelloderm.
A. Phellogen, B. Phellem, C. Phelloderm, D. complementary tissue
A. Phelloderm, B. Phellem, C.Complementary
4. Inner, darker & harder
portion of secondary xylem that cannot conduct water in an older dicot stem is
5. The common bottle cork is a
6. What is the fate of primary
xylem in a dicot root showing extensive secondary growth?
It is retained in the center of the axis
b. It gets crushed
May or may not get crushed
It gets surrounded by primary phloem
Assertion and Reason
These questions consist of two statements each printed as Assertion and Reason.
While answering these questions you are required to choose any one of the
following four responses.
If both Assertion and Reason are true but the Reason is a correct explanation
of the Assertion.
If both Assertion and Reason are true but Reason is not a correct explanation
of the Assertion
If Assertion is true but the Reason is false.
If both Assertion and Reason are false.
1. Assertion: In woody stems the amount
of heart wood continue to increase year after Year
activity of cambial ring continues uninterrupted
Assertion: Secondary growth in dicot
roots occurs with the help of vascular cambium and phellogen.
Vascular cambium is completely primary in origin.
Answer the Following
When the plants shed their leaves how do they respire?
What is wood botanically?
In a forest, if the bark of a tree is damaged by the horn of a deer, How will
the plant overcome the damage?
Differentiate the wood formed in Pinus from that of Morus
In which season the vessels of angiosperms are larger in size, why?
Central part of the wood is always dark. Why?
Continuous state of dividing tissue is called meristem. In connection to this,
what is the role of lateral meristem?
A timber merchant bought 2 logs of wood from a forest & named them A &
B, The log A was 50 year old & B was 20 years old. Which log of wood will
last longer for the merchant? Why?
A cross section of tree trunk contains 60 lighter and 60 darker rings.
Determine the age of the tree and justify
A transverse section of the trunk of a tree shows concentric rings which are
known as growth rings. How are these rings formed? What are the significance of
There are many tissues produced outside the vascular cambium in the stem.
When you go to a timber mart to collect timber for your construction of a new
house, how will you select good timber?
Explain artificial seasoning.