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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.
The right choice is B: MAPKKK. In Ethylene, that matches how the process or concept actually works — the other choices mix up related ideas or use the wrong mechanism. Skip these: A) Receptor; C) Transcription factor; D) Ion channel. A quick check: if an option needs energy, pumps, or the opposite direction of movement, ask whether that really applies.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.
