$A$ green plant turns pale when transferred to prolonged darkness. It represents a phenomenon called

Parthenocarpic tomato fruits can be produced by

Differentiate between the following plant growth regulators:
$(1)$ Auxins $(IAA)$ and Abscisic acid $(ABA)$
$(2)$ Gibberellins and Ethylene

Match the following scientists with their respective contributions:
$(a)$ Maheshwari $(I)$ Pre-sowing treatment of seeds of $Phaseolus$ $aureus$ with $IAA$
$(b)$ Das $(II)$ $Avena$ curvature test
$(c)$ Went $(III)$ Work on seedless fruit in cucumber
$(d)$ Chakravarty $(IV)$ Successful culture of an ovule of $Papaver$ using $IAA$ and kinetin
Select the correct matching sequence:

The cause of special flavour in onion and garlic is due to the presence of

Analogy type question:
$(1)$ Skoog and Miller : Cytokinin :: Cousins : ..........
$(2)$ Cytokinin : Herring fish $DNA$ :: Gibberellin : ........