Question

why does one ring increase in the trunk of a tree each year?which tissue is responsible?

Answer 1

HEY MATE!

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1)The tree creates new cells annually and these are arranged in the concentric circle, therefore, it is called annual growth rings. 

2). The tissues which are responsible for the increase of rings in the trunk is vascular tissue.

Hope it helps you!

Answer 2

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The growth rings are concentric rings, also known as annual rings. Secondary growth gives rise to these rings. Secondary growth occurs due to the activity of meristematic tissue, cambium. By counting these rings, one can determine the age of the tree.