Anatomy of Flowering Plants - 30 For Class 11th and BHU

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Annual Rings or Growth Rings :
The activity of cambium ring is markedly affected by variations in climate e.g., in temperate regions where changes in climate in different seasons of the year are pronounced the xylem cells produced in spring season are with wider lumens. The secondary xylem formed during this period of pronounced activity is called spring wood. During autumn season the vessels produced are generally of smaller size and have narrow lumens. The secondary wood formed during this season is called autumn wood. One spring wood circle and one autumn wood circle constitute an annual ring. The number of annual rings in the oldest part of the tree corresponds to its age.

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