Q. No.
The region of secondary xylem which comprise dead element with highly lignified walls is called
(1) Casparian strip
(2) Heartwood
(3) Sapwood
(4) Bark
(1) Casparian strip
(2) Heartwood
(3) Sapwood
(4) Bark
The peripheral region of secondary xylem lighter in colour is
(1) Sapwood
(2) Heartwood
(3) Annular wood
(4) Bark wood
Phellogen, phellem and phelloderm are collectively known as
| 1. | Phellogram | 2. | Periderm |
| 3. | Cork | 4. | Phalanges |
Bark that is formed early in season is called __________ bark.
| 1. | Hard | 2. | Soft |
| 3. | Turbid | 4. | Lenticels |
Bark formed towards the end of the season is called ________ bark.
1. Soft
2. Hard
3. Turbid
4. Rigid
The exchange of gases between the outer atmosphere and internal tissue of stem is through ___________.
| 1. | Lenticels | 2. | Legume |
| 3. | Epidermis | 4. | Cambium ring |
In dicot root the vascular cambium is completely _________ in origin.
(1) Primary
(2) Secondary
(3) Tertiary
(4) Quaternary
Death of protoplasm is a pre-requisite for vital function like
(1) Transport of sap
(2) Transport of food
(3) Absorption of water
(4) Gaseous exchange
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