what is annual ring
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Annual ring : A ring on the cross section of the stem or root of a temperate woody plant, produced by one year's growth
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Annual ring is the alternation of spring wood and autumn wood in a concentric circle on the trunk
When the plant is young, stem is also young. The vascular cambium at this stage is present as a single layer. As the stem grows, complete ring called as cambial ring is formed. Cambial ring leads to the formation of secondary xylem and secondary phloem. Cambial ring also gives rise to medullary rays.
Cambial activity is influenced by environmental factors. During spring, cambium is active and gives rise to wood with lot of xylary elements with vessels having wider cavities. This type of wood is called as spring wood or early wood.
During winter, cambium is inactive and gives rise to wood with less number of xylary elements with narrow cavities. This wood is called as autumn wood or late wood.
These two types of wood appear in two concentric circles on the trunk and together form a n annual ring. One annual ring is formed in one year. Annual rings are useful in determining the age of the trees.
When the plant is young, stem is also young. The vascular cambium at this stage is present as a single layer. As the stem grows, complete ring called as cambial ring is formed. Cambial ring leads to the formation of secondary xylem and secondary phloem. Cambial ring also gives rise to medullary rays.
Cambial activity is influenced by environmental factors. During spring, cambium is active and gives rise to wood with lot of xylary elements with vessels having wider cavities. This type of wood is called as spring wood or early wood.
During winter, cambium is inactive and gives rise to wood with less number of xylary elements with narrow cavities. This wood is called as autumn wood or late wood.
These two types of wood appear in two concentric circles on the trunk and together form a n annual ring. One annual ring is formed in one year. Annual rings are useful in determining the age of the trees.
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