In this article we will discuss about the vegetative and sexual methods of reproduction that occur in the life cycle of Navicula. Vegetative Reproduction: It takes place by the mitotic cell division or fission. Successive cell division takes place very rapidly at night. Presence of aluminium-silicate in water is essential for cell division to occur. As the cell division starts, [...]
In this article we will discuss about Sargassum:- 1. Occurrence of Sargassum 2. Thallus Structure of Sargassum 3. Growth. Occurrence of Sargassum: The genus Sargassum is represented by about 150 species. The genus is widely distribute; specially in warmer regions mainly in tropical and subtropical seas of the southern hemisphere. The plants form large floating masses in the Atlantic ocean [...]
In this article we will discuss about the asexual and sexual reproduction that occurs in the life cycle of ectocarpus. (i) Asexual Reproduction in Ectocarpus: The asexual reproduction takes places with the help of biflagellate zoospores. These zoospores are produced in unilocular and plurilocular sporangia (Fig. 1 B). The sporophytic diploid plant forms two types of sporangia: (a) Unilocular sporangia [...]