Q. No.What is true about cork cambium?
1.
It is extrastelar cambium in dicot stem.
2.
In dicot stem it arises from the cells of cortex region.
3.
It is also known as phellogen.
4.
All the above
Read the following statements with respect to pericycle and choose the suitable option
| (a) | It is the outermost portion of stele, that may be paranchymatous or sclerenchymatous. |
| (b) | It is absent in monocot stems. |
| (c) | It is always single layered. |
| 1. | Only (a) is correct |
| 2. | Only (b) is incorrect |
| 3. | Only (c) is incorrect |
| 4. | Both (a) & (b) are incorrect |
State True (T) or False (F) to the given statements and select the correct option
(A) Annual rings are distinct in plants growing in temperate regions.
(B) Lenticels occur in most woody trees and permit the exchange of gases.
(C) Due to stellar secondary growth, central cylinder of wood surrounded by secondary phloem is formed.
(D) The cells of endodermis opposite to protoxylem divide to give rise vascular cambium in dicot roots.
(A) (B) (C) (D)
1. T T F F
2. T T T F
3. T F T F
4. F F T T
Read the following statements about dicot stem and
choose the correct option.
| (a) | Vascular bundles are arranged in a ring. |
| (b) | Vascular bundles are conjoint, collateral and open type. |
| (c) | Endarch type of arrangement of secondary xylem. |
| 1. | Only (b) is correct |
| 2. | Only (c) is incorrect |
| 3. | Both (a) and (b) are incorrect |
| 4. | All three statements are correct |
What is incorrect for companion cell?
| 1. | It is specialized parenchymatous cell. |
| 2. | It helps in maintaining the pressure gradient in the sieve tubes. |
| 3. | It does not retain nucleus throughout the life. |
| 4. | It is absent in gymnosperms |
State True (T) or False (F) to the given statements and
select the correct option
| 1. | All tissue layers exterior to the vascular cambium constitute bark. |
| 2. | Root hypodermis is sclerenchymatous. |
| 3. | Ground tissue of leaves is called mesophyll. |
| 4. | Due to presence of casparian strips, endodermis is impervious to water. |
| (A) | (B) | (C) | (D) | |
| 1. | T | F | F | T |
| 2. | T | F | T | T |
| 3. | F | T | T | F |
| 4. | T | F | T | F |
Select the incorrect statement with respect to vessel
| 1. | Devoid of protoplasm. |
| 2. | Lignified wall. |
| 3. | Long cylindrical tube like cells. |
| 4. | Presence of vessel is characteristic of gymnosperm. |
In the given diagram, which is not related with (A) as indicated in the diagram?
| 1. | Complimentary cells. |
| 2. | Involved in the exchange of gases. |
| 3. | Lens-shaped opening called lenticels. |
| 4. | Found in herbaceous trees. |
The diagram given below belongs to -
| 1. | Dicot stem having conjoint and collateral vascular bundles |
| 2. | Monocot stem having conjoint and collateral vascular bundles |
| 3. | Dicot root with polyarch condition |
| 4. | Monocot root with radial vascular bundles |
Hypodermis in dicot stem is composed of
1. Parenchyma
2. Collenchyma
3. Sclerenchyma
4. Both 1. and 3.
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