sieve cell, companion cells, phloem parenchyma, phloem sclerenchyma
(define in 1or2 lines)
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Answer:
Explanation:
1) a sieve element of a primitive type present in ferns and gymnosperms, with narrow pores and no sieve plate
2) any of a number of specialized parenchymal cells adjacent to a sieve tube in the phloem of flowering plants, believed to regulate the flow of nutrients through the tube.
3) Phloem parenchyma cells, called transfer cells and border parenchyma cells, are located near the finest branches and terminations of sieve tubes in leaf veinlets, where they also function in the transport of foods. Phloem fibres are flexible long cells that make up the soft fibres…
4) The phloem sclerenchyma is comprised of sclerenchyma cells that are rather associated with providing mechanical support than conducting materials. It includes the phloem fibers and the sclereids. The phloem fibers are one of the supportive cells of the phloem tissue; the others are sclereids.
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