Identify the ODD term in each set and name the CATEGORY to which the remaining three belong:
Auxin, Ethylene, Adrenaline, Cytokinin
Topic: Plant hormones
Answer
Odd one out: ADRENALINE. Category of the others: PLANT HORMONES (phytohormones).
Auxin, ethylene and cytokinin are all PLANT hormones. ADRENALINE is an ANIMAL hormone, secreted by the adrenal medulla in an emergency to prepare the body for fight or flight.
THE METHOD for every odd-one-out question: do not hunt for the odd term first. Find what the MAJORITY share, and whatever fails that test is the odd one.
The question asks for TWO things — the odd term AND the category of the rest. Naming only the odd term loses half the mark.
The four plant hormones by effect: AUXIN (cell elongation, tropisms), GIBBERELLIN (stem and fruit elongation), CYTOKININ (cell division), ETHYLENE (ripening of fruits — the only gaseous one), and ABSCISIC ACID (the stress hormone).