The removal of a ring of bark from trunk of a tree eventually kills it, since

Minerals salts cannot go up

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Water cannot go up

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Food does not travel down and roots are starved

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The exposed part becomes infected with fungi

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Solution

The correct option is C Food does not travel down and roots are starved
Ringing or girdling experiment was first performing by Hartig(1937). This experiment suggest that in absence of phloem, Downward translocation of food is stopped .

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