Q.3 From your knowledge of physiology can you think of some method of increasing the life of cut plants in a vase?

The life of cut plant in a vase can be increased by placing them in water immediately as air will rapidly move into the water conducting tissue and plug the cell. Also, providi nutrients and elements in a varied concentration Can increase the life span of plants.
One phytohormone called cytokine can also be sprayed or plants can be dipped in the solution, as it delays the senescence of plant.