Which of the following is not the advantage of asexual reproduction () A. The propagation mode is simple B. The excellent characteristics of the variety can be maintained C. The propagation speed is improved The way in which plants propagate by using vegetative organs such as roots, stems and leaves is called vegetative propagation. For example, when strawberries, potatoes and deciduous leaves take root and propagate, new individuals are directly produced by the mother, and the combination of bisexual germ cells is not needed. This kind of reproduction is called asexual reproduction. Vegetative reproduction is the most common way of asexual reproduction. Common ways of asexual reproduction are cutting, grafting and layering. Asexual reproduction is fast, materials are easily available, and the characteristics of parents can be maintained.

So choose: D.