defination of parenchyma,collenchyma,scleranchya
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a)Parenchyma – These are living, polygonal cells with a large central vacuole, and have intercellular spaces between them. These belong to simple permanent tissue category. Parenchymatous cells form the ground tissue and pith.
Parenchyma containing chloroplasts are called chlorenchyma. The chlorenchyma helps in photosynthesis.
Parenchyma which contain large air cavities are called aerenchyma. The aerenchyma help in buoyancy.
Some parenchymatous cells act as storage cells for starch in fruits and vegetables.
b)Collenchyma – These are elongated living cells with small intercellular spaces. Their cell walls are made up of cellulose and pectin. Collenchyma occur in the peripheral regions of stems and leaves to provide mechanical support and flexibility in plants.
c)Sclerenchyma – These are long, dead cells with a deposit of lignin in their cell wall. They have no intercellular spaces. Sclerenchyma occurs around the vascular tissues in stems, in the veins of leaves, and in the covering of seeds and nuts. They provide strength to the plant.
@skb
Parenchyma containing chloroplasts are called chlorenchyma. The chlorenchyma helps in photosynthesis.
Parenchyma which contain large air cavities are called aerenchyma. The aerenchyma help in buoyancy.
Some parenchymatous cells act as storage cells for starch in fruits and vegetables.
b)Collenchyma – These are elongated living cells with small intercellular spaces. Their cell walls are made up of cellulose and pectin. Collenchyma occur in the peripheral regions of stems and leaves to provide mechanical support and flexibility in plants.
c)Sclerenchyma – These are long, dead cells with a deposit of lignin in their cell wall. They have no intercellular spaces. Sclerenchyma occurs around the vascular tissues in stems, in the veins of leaves, and in the covering of seeds and nuts. They provide strength to the plant.
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1) Parenchyma is a simple permanent plant tissue composed of thin walls, unspecialized cells separated by intercellular spaces and which have not lost their power of division
2)Collenchyma is a simple permanent plant tissue containing cells characterised by cell walls unevenly thickened with cellulose and functioning mainly as flexible and supportive tissue
3)Sclerenchyma is also a simple permanent plant tissue containing dead cells with heavily lignified cell walls and functioning as a strengthning tissue
2)Collenchyma is a simple permanent plant tissue containing cells characterised by cell walls unevenly thickened with cellulose and functioning mainly as flexible and supportive tissue
3)Sclerenchyma is also a simple permanent plant tissue containing dead cells with heavily lignified cell walls and functioning as a strengthning tissue
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