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1 question · 2011 · answers as per the UPSC key

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UPSC 2011 · Q18 · Science & Technology › Biology · Save

When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because

(a) Water from soil cannot rise to aerial parts
(b) Roots are starved of energy
(c) Tree is infected by soil microbes
(d) Roots do not receive oxygen for respiration
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Answer: (b) Roots are starved of energy