Which are the sugar-conducting components in gymnosperms and pteridophytes?

  • A
    Sieve cells
  • B
    Sieve elements
  • C
    Sieve tubes
  • D
    Sieve tube elements

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What type of food materials are stored by xylem parenchyma and phloem parenchyma?

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From both phylogenetic and ontogenetic points of view,which tissue is regarded as the most primitive?

Assertion: In angiosperms,the conduction of water is more efficient because their xylem has vessels.
Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria.

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