Annual rings and growth rings are formed due | vedclass

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(D) The activity of the vascular cambium is under the control of many physiological and environmental factors. In temperate regions,the climatic condi

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Cambium

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(D) The activity of the vascular cambium is under the control of many physiological and environmental factors. In temperate regions,the climatic conditions are not uniform throughout the year. In the spring season,the cambium is very active and produces a large number of xylary elements having vessels with wider cavities. The wood formed during this season is called spring wood or early wood. In winter,the cambium is less active and forms fewer xylary elements that have narrow vessels,and this is called autumn wood or late wood. The two kinds of woods that appear as alternate concentric rings constitute an annual ring. Thus,annual rings are formed due to the seasonal activity of the cambium.

Annual rings and growth rings are formed due to the fluctuation in the activity of .......... .

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