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Plant biology (Tissues types of the plant system (Vascular bundle:…

- - - - Sieve tubes
        
        Fibres of sclerenchyma cells and provides structural
        
        Companion cells are life support for the sieve element cells as they perform certain metabolic functions therefore plasmodesmata (microscopic pores in the cell walls, between companion and sieve element are larger than in most plant cells to allow for the exchange of metabolites.