An annual ring is formed by

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(B) In temperate regions,the climatic conditions are not uniform throughout the year. During the spring season,the cambium is very active and produces

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Two alternate rings of spring wood and autumn wood

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(B) In temperate regions,the climatic conditions are not uniform throughout the year. During the spring season,the cambium is very active and produces a large number of xylem elements with vessels having wider cavities,known as spring wood or early wood. In winter,the cambium is less active and produces fewer xylem elements with narrow vessels,known as autumn wood or late wood. One annual ring consists of one band of spring wood and one band of autumn wood formed in a single year.

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