diamondno1 diamondno1
  • 12-01-2021
  • Biology
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Why do gymnosperms and lower vascular plants lack companion cells?​

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Firenz
Firenz Firenz
  • 12-01-2021

Answer:

Gymnosperms and lower vascular plants have sieve cells as their sieve elements, while sieve tubes are characteristic of flowering plants angiosperms. In gymnosperms, typical companion cells are lacking in the phloem. In gymnosperms, generally the xylem contains only tracheids. Vessels are absent.

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