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Question
In which of the following groups, the majority of plant orders contain the vascular tissue wherein the vessels and companion cells are absent in the xylem and phloem?
In which of the following groups, the majority of plant orders contain the vascular tissue wherein the vessels and companion cells are absent in the xylem and phloem?
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Solution
The correct option is D Gymnosperms
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.
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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