Asexual reproduction is a way to produce new individuals directly from the mother without germ cells. In essence, somatic reproduction is asexual reproduction. The main types include fission propagation, spore propagation, bud grafting propagation and vegetative propagation (grafting, layering, cutting, etc.). ), tissue culture and cloning.

① The concept of plant tissue culture (broad sense), also called in vitro culture, refers to the technology of separating tissues, organs or cells, protoplasts, etc. They are cultured under artificial control through aseptic operation to obtain regenerated complete plants or produce other products with economic value. The concept of plant tissue culture (narrow sense) refers to the utilization of various parts of plants, such as cambium.

(2) Sexual germ cells produced by parents become fertilized eggs through the combination of bisexual germ cells (such as sperm and egg cells), and then the fertilized eggs develop into a new individual reproductive mode, which is called sexual reproduction;

(3) The reproductive mode of producing new individuals from vegetative organs (roots, leaves and stems) of plants is called vegetative reproduction. For example, potato tubers, thistle roots, strawberry creeping branches and begonia leaves can all germinate, and these buds can form new individuals.

(4) Fission reproduction, also known as fission, is a reproductive mode in which an organism splits from its mother to produce new offspring. New individuals born by fission reproduction are roughly the same in size and shape. This way of reproduction is very common in single-celled organisms. For example, paramecium, amoeba, Eupolyphaga and bacteria are all fission reproduction.

The cut potato tubers with bud eyes are buried underground to propagate potato seedlings, and stem propagation belongs to vegetative propagation.

So choose: C.