Choose the odd one out from the following terms and name the category to which the others belong:
Auxin, Oxytocin, Gibberellin, Cytokinin
Topic: Plant hormones
Answer
Odd one out: OXYTOCIN. Category of the others: PLANT HORMONES (phytohormones).
Auxin, gibberellin and cytokinin are all PLANT hormones. Oxytocin is an ANIMAL hormone, secreted by the posterior lobe of the pituitary gland in humans, where it causes uterine contractions during childbirth and the ejection of milk.
THE METHOD for every odd-one-out question: do not hunt for the odd term first. Find what the MAJORITY have in common, and whatever fails that test is the odd one. Here three of the four are plant hormones, so oxytocin stands out at once.
And note that the question asks for TWO things — the odd term AND the category of the others. Naming only the odd term loses half the mark. Write both, as: "Oxytocin; the others are plant hormones."