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 |
Lenticels are involved in:
| 1. | Gaseous exchange | 2. | Food transfer |
| 3. | Photosynthesis | 4. | Transpiration |
Companion cells are closely associated with:
| 1. | Sieve elements | 2. | Vessel elements |
| 3. | Trichomes | 4. | Guard cells |
Water containing cavities in vascular bundles are found in:
1. Sunflower
2. Maize
3. Cycas
4. Pinus
© 2025 GoodEd Technologies Pvt. Ltd.