We are provided with five sets of terms. Let's go through each set and identify the odd term:
(a) Auxin, Oxytocin, Gibberellin, Cytokinin:
These are all plant hormones, except Oxytocin, which is a hormone found in humans and animals.
(b) Growth Hormone, Vasopressin, Thyroid Stimulating Hormone, Gonadotropic Hormone:
These are all human/animal hormones, so no odd term here.
(c) Urochrome, Urea, Uric acid, Nucleic acid:
Urochrome is a pigment found in urine, whereas the other terms are nitrogenous waste products.
(d) Cervix, Chordae Tendinea, Papillary Muscles, Sinoatrial node:
The odd term is Sinoatrial node, as it is related to the heart's electrical activity, while the others are structures in the heart involved in mechanics.
(e) Morula, Blastocyst, Oviduct, Foetus:
The odd term is Oviduct, as it is a structure through which the egg passes, while the others are stages or forms of development.