I. Kinetin is a degradative substance from DN | vedclass

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(C) $I.$ Kinetin is a modified form of adenine (a purine) obtained from autoclaved herring sperm $DNA$,making the statement correct.$II.$ $ABA$ (Absci

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$I$ and $III$

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(C) $I.$ Kinetin is a modified form of adenine (a purine) obtained from autoclaved herring sperm $DNA$,making the statement correct.$II.$ $ABA$ (Abscisic acid) is not present in all lower plants; for example,it is absent in many algae and some bryophytes,making the statement incorrect.$III.$ $A$ low ratio of cytokinin to auxin (high auxin,low cytokinin) promotes root initiation,while a high ratio promotes shoot formation,making the statement correct.$IV.$ $ABA$ is synthesized via the mevalonic acid pathway (terpenoid pathway) in plastids,not through glycolysis,making the statement incorrect.Therefore,statements $I$ and $III$ are correct.

Column $I$	Column $II$
$(a)$ Fruit ripener	$(i)$ Abscisic acid
$(b)$ Herbicide	$(ii)$ $2,4-D$
$(c)$ Bolting agent	$(iii)$ $GA_{3}$
$(d)$ Stress hormone	$(iv)$ Ethephon

$I.$ Kinetin is a degradative substance from $DNA$.
$II.$ $ABA$ is present in all plants including lower plants.
$III.$ Low ratio of cytokinin to auxin favours root formation only.
$IV.$ $ABA$ is synthesized catabolically through glycolysis pathway.
Choose the correct combination of options.

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$I.$ Kinetin is a degradative substance from $DNA$.$II.$ $ABA$ is present in all plants including lower plants.$III.$ Low ratio of cytokinin to auxin favours root formation only.$IV.$ $ABA$ is synthesized catabolically through glycolysis pathway.Choose the correct combination of options.