Correct Answer - c
In the tongue grafting, an oblique cut followed by a notch iws given to both the stock as well scion. The two perfectly fit upon one another, they are tied together. Stock and scion are of same diameter. In bud grafting, scion is a bud with a small piece of bark and cambium. Monocots do not possess cambium, thus the two plants taken can be dicots only. In wedge grafting,v-shaped notch is given to stock while wedge like cut is given to scion. both of same diameter, in crown grafting, many6 scions are selected and shaped at the base to form wedge. Many slits are formed on the sides of stock. Scions are inserted in the slits and bandaged. Stock has large diameter diameter than scion.