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#copper transport

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CTR1 acts as:

That points to B: Negative regulator. Compared with the other options, Negative regulator is the one that correctly describes the Ethylene concept. The wrong ones are A) Positive regulator; C) Receptor; D) Ligand. If you’re stuck, eliminate anything that contradicts a basic fact you already know for this topic.

Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.