Q. No.Read the different components from I to IV in the list given below and tell the correct order of the components with reference to their arrangement from the outer side to the inner side in a woody dicot stem.
| I. | Secondary Cortex |
| II. | Wood |
| III. | Secondary phloem |
| IV. | Phellem |
The correct order is:
| 1. | III, IV, II, I | 2. | I, II, IV, III |
| 3. | IV, I, III, II | 4. | IV, III, I, II |
Vascular bundles in monocotyledons are considered closed because:
| 1. | a bundle sheath surrounds each bundle |
| 2. | cambium is absent |
| 3. | there are no vessels with perforations |
| 4. | xylem is surrounded all around by phloem |
A major characteristic of the monocot root is the presence of:
| 1. | Scattered vascular bundles |
| 2. | Vasculature without cambium |
| 3. | Cambium sandwiched between phloem and xylem along the radius |
| 4. | Open vascular bundles |
You are given a fairly old piece of dicot stem and a dicot root. Which of the following anatomical structures will you use to distinguish between the two?
| 1. | Secondary xylem | 2. | Secondary phloem |
| 3. | Protoxylem | 4. | Cortical cells |
Tracheids differ from the tracheary elements in:
| 1. | Having casparian strips |
| 2. | Being imperforate |
| 3. | Lacking nucleus |
| 4. | Being lignified |
Age of a tree can be estimated by:
1. biomass
2. number of annual rings
3. diameter of its heartwood
4. its height and girth
Lenticels are involved in:
| 1. | Gaseous exchange | 2. | Food transfer |
| 3. | Photosynthesis | 4. | Transpiration |
Interfascicular cambium develops from the cells of:
1. Xylem parenchyma
2. Endodermis
3. Pericycle
4. Medullary rays
| 1. | Guard cells invariably possess chloroplasts and mitochondria |
| 2. | Guard cells are always surrounded by subsidiary cells |
| 3. | Stomata are involved in gaseous exchange |
| 4. | Inner walls of guard cells are thick |
1. Intercalary meristem
2. Lateral meristem
3. Phellogen
4. Apical meristem
© 2025 GoodEd Technologies Pvt. Ltd.