Fill in the following blanks with suitable words :

(a) The process of..............ensures continuity of life on earth.

(b) Plasmodium reproduces by the process of ............... fission whereas Paramecium reproduces by the process of .............. fission.

(c) Rose plants and sugar cane crop are usually grown by the ................. method.

(d) Vegetative reproduction of potato plants is done by using .................

(e) Strawberry plants are propagated by the natural........................ method.