A: | Lenticels are the lens-shaped openings permitting the exchange of gases. |
B: | Bark formed early in the season is called hard bark. |
C: | Bark is a technical term that refers to all tissues exterior to vascular cambium. |
D: | Bark refers to periderm and secondary phloem. |
E: | Phellogen is single- layered in thickness. |
1. | B and C only | 2. | B, C and E only |
3. | A and D only | 4. | A, B and D only |
Select the correct statements related to the activity of cork cambium:
1. | The outer cells differentiate into phelloderm. |
2. | The cork differentiated from cork cambium, is impervious to water due to deposition of tannins and resins. |
3. | Cuts the cells only on the outer side. |
4. | Cuts the cells on inner as well as outer side. |
Match List-I with List-II.
List -I | List-I |
(a)Lenticels (b)Cork cambium (c) Secondary cortex (d)Cork |
(i) Phellogen (ii) Suberin deposition (iii) Exchange of gases (iv) Phelloderm |
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (ii) (iii) (iv) (i)
2. (iv) (ii) (i) (iii)
3. (iv) (i) (iii) (ii)
4. (iii) (i) (iv) (ii)
Which of the following statements about cork cambium is incorrect?
1. | It forms a secondary cortex on its outside |
2. | It forms a part of periderm |
3. | It is responsible for the formation of lenticels |
4. | It is a couple of layers thick |