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In which season the vessels of angiosper...

In which season the vessels of angiosperms are larger in size, why ?

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In the spring season, cambium is very active and produces a large number of xylary elements having vessels /tracheids with wide lumen. This is because in spring season the climatic conditions are favorable for the growth of plants with optimum temperature, light and photosynthesis is at the peak.
This requires the uptake and transport of large quantities of water. Further the soil has good water content in spring unlike in summer /winter.
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