Collenchyma cells MCQ - Practice Questions with Answers

Simple Permanent Tissues: Collenchyma

• Collenchyma is the simple permanent tissue having more or less elongated cells with the primary non-lignified cell wall.
• Their cell walls are their distinctive features that show uneven thickenings.
• They have a highly vacuolated cytoplasm. 
• These are effective mechanical tissues and provide elasticity to the plant parts.
• They show a unique pattern of distribution as follows:
• Present only in dicots
• Present only in the shoot
• Present only in the hypodermis
• Never present in monocots
• Never present in roots
• Never present in underground stem
• They have a polygonal shape. 
• These are the living tissues in the plant body.

Types of Collenchyma: Based on the thickening patterns, there are the following types of collenchyma:

1. Angular collenchyma: They have thickenings on angles between the cells.
2. Lamellar collenchyma: They have thickenings on tangential walls.
3. Lacunar collenchyma: They have thickenings on walls facing the intercellular spaces.
    

                 Angular collenchyma                               Lamellar collenchyma                              Lacunar collenchyma                         

Functions of Collenchyma:

1. Provide mechanical support to petiole, pedicels, branches of stem, roots, and fruits.
2. If they contain chlorophyll they help in photosynthesis.
3. It is present at the margins of some leaves and resists  the tearing and bending effect of the wind.