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1. Parenchyma –
• They are found below the epidermis.
• They form the bulk of packing tissue within the plant between other tissues .
• They are tightly packed and turgid they provide support.
2. Collenchyma –
• Their cell walls have additional cellulose deposited in the corners.
• This provides them with extra mechanical strength.
3. Sclerenchyma –
• Their cells are dead due to large deposits of lignin on the primary cell wall.
• The lignified wall is thick and inner lumen is small, hence provide support.
• Sclerenchyma fibres are arranged in elongated and in longitudinal sheets giving extra support.
• They are found in mature plants.
4. Xylem –
• Has two types of specialised cells.
• Vessels and tracheids.
• Vessels are thick-walled tubes with lignin deposited in them.
• They give support and strength to the plant.
• Tracheids are spindle-shaped cells arranged with ends overlapping.
• Their walls are lignified.
• They help to support and strengthen the plant.
Wilfykil answered the question on February 28, 2019 at 12:35
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