During animal life cycle, animals are expected to give out eggs and sperms to reproduce. Likewise plants does too but is reproduced through stages, or generation. As the diagram illustrate, the adults have to produce spores, which the spores then produce sex cells. There are two generations:sporophyte ( spore producing plants) and gametophyte(sex-cell producing cells).The two generations can be differentiated by the chromosomes they carry. Reference: http://www.learner.org/courses/essential/life/session4/closer1.html
In the spores generation, only one parent is needed to create an offspring with the characteristics it needs to survive. In sex parents, both give their characteristics causing a mix. This however can be a benefit depending on their environment. For example, mosses are used as a primitive group. The sporophyte are clearly shown on the stalk representing the location, spores are caste on top. The gameotophye are on the bottom. The stalk connected to the gametophyte creates the egg. Water would be necessary to complete it.
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