GATE 2023 ES – Question 42
Consider I Liebig’s minimum law concerns limiting scarce resources;II Shelford tolerance says only excess factors affect growth;III Shelford describes minimum, maximum and optimal environmental levels for success.
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Correct answer: (B) I, III correct;II false
Explanation
Liebig identifies the resource in shortest effective supply relative to need. Shelford recognizes harmful deficiency as well as excess, with a tolerable range and an optimum. Thus I and III are correct, while II incorrectly excludes deficiency. Choose **B**.