Annual rings are bands of .........

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(C) Annual rings,also known as growth rings,are formed due to the differential activity of the vascular cambium in temperate regions.During the spring

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Secondary xylem and xylem rays

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(C) Annual rings,also known as growth rings,are formed due to the differential activity of the vascular cambium in temperate regions.During the spring season,the cambium is very active and produces a large number of xylem elements with wider vessels,forming the spring wood (early wood).In winter,the cambium is less active and produces fewer xylem elements with narrow vessels,forming the autumn wood (late wood).These two types of wood appear as concentric rings in the cross-section of the stem,which together constitute an annual ring.Therefore,annual rings are primarily composed of secondary xylem and xylem rays.

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