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