Adaptations of phloem to its functions

Adaptations of phloem to its functions

• The sieve tubes are elongated, cylindrical cells connected, end to end. Their end walls have perforated sieve plates to allow easy flow of materials
• The sieve tubes have no nuclei to create room for movement of materials
• Within the lumen of sieve elements are cytoplasmic filaments/strands which are continuous rom cell to cell to enable continuous flow of materials.
• The companion cells have nuclei and other organelles. They control the flow of materials through the phloem sieve tubes.

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