NEET 2013 Biology question

Age of a tree can be estimated by :

(1)Its height and girth
(2)Biomass
(3)Number of annual ringsCorrect
(4)Diameter of its heartwood

Answer: (3)

Solution

In temperate regions the cambium is active in spring (large-vessel, light-coloured early wood) and less active in autumn (small-vessel, dark late wood). The two together form one annual ring each year,

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Question ID VK-091395