The dark coloured dead wood present in the central region of old tree is
spring wood
heart wood
sap wood
cambium
B.
heart wood
Heart wood is also known as dead wood which is formed by the lignification or resin collection in sap wood. The wood is called secondary xylem. The cambium is in the ring of meristematic cell which produce secondary
xylem and phloem in dicots.
If there is more than one tunica layer in stem apex, which among the following is most likely to happen?
All the layers will develop into epidermal cells
Only the outer layer will develop into epidermal cells
All the layers will develop into cortex
Inner layer develops into cortex
Which of the following region of root is responsible for increase in length of root?
Root cap region
Meristematic region
Region of elongation
Mature region
Atactostele vascular bundles are
scattered in the ground tissue
three in number
in form of ting around
broken vascular bundles
Grafting is not possible in monocots because they
lack cambium
have scattered vascular bundles
have parallel venation
are herbaceous
A dicotyledonous plant forms crown gall when
Agrobacterium tumefaciens comes in contact with the plant
Agrobacterium rhizogenes comes in contact with the plant
a specific part of DNA from the Ti-plasmid gets integrated with the plant chromosome
a specific part of DNA from the Ri-plasmid gets integrated with the plant chromosome
Match the following Columns
| Column I | Column II |
| A. Tracheids | 1. Cells posses highly thickness walls with obliterates central lumen |
| B. Vessels | 2. Elongated tube like cells with thick lignified walls and tampering ends |
| C. Xylem parenchyma | 3. Individual members are interconnected through perforations in their common walls |
| D. Xylem fibres | 4. Cells are living with thin cellulosic cell walls. |
The correct answer is
A- 2; B- 3; C- 4; D- 1
A- 2; B- 4; C- 1; D- 3
A- 3; B- 2; C- 4; D- 1
A- 2; B- 3; C- 1; D- 4
