Question:
Match List - I with List - II.
List - 1 List - 1 a Lenticels i Phellogen b Cork cambium ii Suberin deposition c Secondary cortex iii Exchange of gases d Cork iv Phelioderm
Choose the correct answer from the options given below.
Match List - I with List - II.
| List - 1 | List - 1 | ||
|---|---|---|---|
| a | Lenticels | i | Phellogen |
| b | Cork cambium | ii | Suberin deposition |
| c | Secondary cortex | iii | Exchange of gases |
| d | Cork | iv | Phelioderm |
Choose the correct answer from the options given below.
Updated On: Jun 15, 2026
- (a) - (iv) , (b) - (i), (c) - (iii) , (d) - (ii)
- (a) - (iii) , (b) - (i), (c) - (iv) , (d) - (ii)
- (a) - (ii) , (b) - (iii), (c) - (iv) , (d) - (i)
- (a) - (iv) , (b) - (ii), (c) - (i) , (d) - (iii)
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The Correct Option is B
Solution and Explanation
To solve this problem, we need to match each term in List-I with the correct description in List-II. Let's evaluate each pair step by step:
- Lenticels - Lenticels are small openings or pores in the bark of woody plants that allow the exchange of gases between the internal tissues and the environment. This matches with iii. Exchange of gases.
- Cork cambium - Cork cambium, also known as phellogen, is a type of lateral meristem responsible for generating cork (the protective outer covering) in plants. This matches with i. Phellogen.
- Secondary cortex - Secondary cortex, or phelloderm, is a tissue formed by the cork cambium towards the inside. This matches with iv. Phelioderm.
- Cork - Cork is the protective outer layer of tissue arranged on the outside of the cork cambium, which has suberin deposition making it water-resistant. This matches with ii. Suberin deposition.
Based on these pairings, the correct matching option is:
(a) - (iii) , (b) - (i), (c) - (iv) , (d) - (ii)
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Concepts Used:
Secondary Growth
Secondary growth is an increase in girth of thickness of the axis due to activity of lateral meristem. The tissues involved in secondary growth are two lateral meristems are vascular cambium and cork cambium.
Secondary Growth in Stem:
Formation of Cambium Ring-
- The cambium present between the xylem and phloem in vascular bundles is called Fascicular or Interfascicular cambium.
- In secondary growth, few medullary ray cells that are located between vascular bundles also become meristematic, and it is known as Interfascicular cambium.
Formation of the secondary tissues-
- The cambium ring cuts off cells on both sides. It produces secondary phloem outwardly and secondary xylem inwardly.
- The amount of secondary xylem cut off is more than the secondary phloem.
Secondary Growth in Root:
Vascular Cambium-
- The cambium is absent initially but develops later at the time of secondary growth.
- The pericycle cells lying outside the protoxylem and the conjunctive parenchyma cells on the lateral side of the phloem bundle become meristematic to form many cambial strips.
Cork Cambium-
- The cork cambium develops because of the tangential division of cells of the pericycle.
- The activity of cork cambium is like that found in the dicot stem, so it produces cork cells or phellem towards the outside and phelloderm or secondary cortex towards the inside.
Abnormal secondary growth:
- Due to absence of the cambium in monocots, monocots don’t show secondary growth and the vascular system is totally composed of primary tissues.
- The vascular bundles are irregularly scattered in the ground tissues, such that the cortex and other ground tissues can’t be differentiated.
- Dracaena, Yucca, Agave are examples of monocots that exhibit a peculiar type of secondary growth in thickness.