Assertion :

Stratification of seeds may promote their germination

Reason :Stratification promote gibberellin and cytokinins

Stratification of seeds may affect the disappearance of inhibitors and the buildup of germination promoters such as the gibberellins and cytokinins. Natural stratification occurs when seeds shed in the fall are covered with cold soil, debris and snow. In artificial stratification, layers of seeds are alternated with layers of moistened Sphagnum sand or some other appropriated material are stored low temperatures.