what are the types of propagation
Radio propagation categories. There are a number of categories into which different types of radio propagation can be placed. These relate to the effects of the media through which the signals propagate. 1  Free space propagation: Here the radio signals travel in free space, or away from other objects which influence the way in which they travel. 2  It is only the distance from the source which affects the way in which the field strength reduces.
1 This type of radio propagation is encountered with signals travelling to and from satellites. 2  Ground wave propagation: When signals travel via the ground wave they are modified by the ground or terrain over which they travel. 3  They also tend to follow the earth's curvature.
This process can give rise to hybrid plants. Assexual Propagation: This process is also called as vegetative propagation. Stem cuttings, root cuttings, leaf cuttings, root division, layering, grafting and budding are all vegetative methods of propagation. Stem Cuttings: Herbaceous stem cuttings of plants like Dahlia, Mint, Portulaca etc. easily root.
Sexual Propagation: Seed formation takes place only after pollination. After fertilization, seeds are formed. Seeds when sown give rise to new plants. Some bisexual flowers are self sterile, that is, pollens from a flower, when deposited on the female part of the same flower will fail to fertilize it.