Maharashtra BoardEnglish MediumSTD 11 ScienceBiologyPlant Tissues and Anatomy5 Marks
Question
Identify the type of tissue shown in the given figure and write its characteristics.
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Answer
The given figure represents Collenchyma tissue. Characteristics of Collenchyma:
It is a simple permanent tissue made up of living cells.
The cell wall is cellulosic but shows uneven deposition of cellulose and pectin especially at comers.
The walls may show presence of pits.
Cells are similar like parenchyma, containing cytoplasm, nucleus and vacuoles but small in size and without intercellular spaces. Thus, the cells appear to be compactly packed.
The cells are either circular, oval or angular in transverse section.
Function: Collenchyma is a living mechanical tissue and serves different functions in plants. a. It gives mechanical strength to young stem and parts like petiole of leaf. b. It allows bending and pulling action in plant parts and also prevents tearing of leaf.| c. It also allows growth and elongation of organs. d. Collenchyma is usually absent in monocots and roots of dicot plant.
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