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Support in plants
Azneezal Ar-RashidSmk Sri Aman
95007 Sri Aman, Sarawak
February 2010
• Submerged plants : Hydrilla sp– Leaves : thin, narrow &
flexible– Resistance to water flow– Stems : no woody tissues
• Floating plants :Hyacinth – Leaves : broad, firm,
flexible– Resistant to wave action– Have aerenchyma tissue
(stems & leaves)• Spongy tissues• Large air spaces• Provide buoyancy
• Terrestrial plants : herbaceous plant– Turgidity
• Parenchyma cells• Collenchyma cells
– Cell walls with cellulose and pectin
• Thicker – Mechanical strength
• Woody plants– Provided by :
• Sclerenchyma tissue– Fibres
» In vascular tissue– Sclereids
» In fruits and seeds
• Xylem tissue– Wood
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