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  4. From evolutionary point of view, tracheids and sieve cells are more primitive than tracheae and sieve tubes respectively. The angiosperms have

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Q. From evolutionary point of view, tracheids and sieve cells are more primitive than tracheae and sieve tubes respectively. The angiosperms have

EAMCETEAMCET 2009

Solution:

In angiosperms, xylem consists tracheids , vessel or tracheae, xylem fibres and xylem parenchyma. Tracheae are absent in ptendophytes and gymnosperms. In angiospermic phloem, sieve elements are sieve tubes, while in gymnosperms and pteridophytes sieve cells are found.