BI-763
Xylem and phloem
Biology · Secondary 3 · Medium · Xylem and phloem
Why is the xylem in the stem of a land plant usually more heavily lignified than in a floating water plant?
- To provide extra mechanical support against gravity and wind
- To increase the rate of photosynthesis in the stem
- To reduce water uptake by the roots
- To allow more sugar transport in the stem
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