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CGP EDU Academic Team
Published on: August 14, 2026
From evolutionary point of view, tracheids and sieve cells are more primitive than vessels and sieve tubes respectively. The angiosperms have
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B
In angiosperms, xylem consists of tracheids, vessels, xylem fibres and xylem parenchyma. Vessels are absent in pteridophytes and gymnosperms. In angiospermic phloem, sieve elements are sieve tubes, while in gymnosperms and pteridophytes sieves cells are found.
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