Question

Define :-
a) Parenchyma
b) Collenchyma

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Answer 1

$\large{\pink{\underline{\underline{\sf{Parenchyma:-}}}}}$

• Parenchyma is a type of simple permanent tissue that makes a major part of ground tissues in plants, where other tissues like vascular tissues are embedded.
• They are non-vascular and composed of simple, living and undifferentiated cells, which are modified to perform various functions.

$\large{\pink{\underline{\underline{\sf{Collenchyma:-}}}}}$

• Collenchyma cells are elongated cells with irregularly thick cell walls that provide support and structure.
• Their thick cell walls are composed of the compounds cellulose and pectin.
• These cells are often found under the epidermis, or the outer layer of cells in young stems and in leaf veins.

Answer 2

$\huge\underline\mathfrak{\star Answer:-}$

$\large\underline\mathtt\green{a)\: Parenchyma:-}$

➢Parenchyma is a type of simple permanent tissue that makes a major part of ground tissues in plants, where other tissues like vascular tissues are embedded. They are non-vascular and composed of simple, living and undifferentiated cells, which are modified to perform various functions.

➢The main characteristics of parenchyma are:

• They are living permanent tissues that have the ability to divide at maturity and help in the regeneration and healing of wounds.
• Parenchyma cells are the foundation of a plant as reproductive cells (spores, gametes) are parenchymatous in nature.
• Single parenchyma cell of a zygote has an ability to develop into an entire plant. These cells are called “totipotent” cells.

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$\large\underline\mathtt\green{b)\:Collenchyma:}$

➢ These are stretched out, living cells with minute intercellular gaps. Their cell walls are made up of pectin and cellulose. Collenchyma is found in the marginal regions of leaves and stems and offers flexibility with the structural framework and mechanical support to plants.

➢Functions of collenchyma:

• Provides mechanical support and elasticity in young dicotyledonous stems.
• Manufactures sugar and starch if their cells possess chloroplast.

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