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Topic: Plant tissues and anatomy of root, stem, leaf· Structural Organisation in Animals and Plants

Which of the statements given below is not true about formation of Annual Rings in trees ?

1. Annual ring is a combination of spring wood and autumn wood produced in a year.

2. Differential activity of cambium causes light and dark bands of tissue - early and late wood respectively.

3. Activity of cambium depends upon variation in climate.

4. Annual rings are not prominent in trees of temperate region.

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Answer: 4. Annual rings are not prominent in trees of temperate region.

Key idea: Annual rings are clearest where seasons differ sharply, so the statement that they are not prominent in temperate trees is false.

In temperate regions the cambium is active in spring (large vessels, light early/spring wood) and slows in autumn (narrow cells, dark late/autumn wood). Together they form one annual ring. Cambium activity depends on climate, so options 1, 2 and 3 are true.

Temperate trees show very distinct rings; in tropical trees with little seasonal change the rings are faint. Hence option 4 is the untrue statement.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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