Annual rings are formed basically due to ________________.

Marked seasonal variations

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Different development of xylem and phloem

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Uniform climate conditions

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Different kinds of phloem

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Solution

The correct option is A Marked seasonal variations
Answer is option A i.e. "Marked seasonal variations"
Annual tree rings are used in analysis of tree growth and it's response to environmental factors. Due to differential seasonal activity of cambium (during autumn and spring season) alternate light & dense wood is cut off leading to formation of annual rings.

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