A number of plants use both sexual and asexual means to produce new plants, some species alter their primary modes of reproduction from sexual to asexual under varying environmental conditions. What is ecological pyramid? Each body may give rise to a new plant, e.g., Chara.Such special star-shaped, starch filled bodies give rise to new plants frequently reported from Chara.Small bud-like structures. This is a question and answer forum for students, teachers and general visitors for exchanging articles, answers and notes. Many algae similarly switch between sexual and asexual reproduction. e) Budding. The reproduction of algae can be discussed under two types, namely asexual reproduction and sexual reproduction. The well known propagula of Bryopsis, Sphacelaria and Nereocystis are good examples.Such thread-like vegetative bodies develop in the case of Chara, which help in reproduction.Usually these bodies are rounded and filled up with abundance of starch. Mitospores (zoospores) are produced but they play no role in alternation of generation. e.g., Zygnema, Spiro­gyra etc.
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Welcome to BiologyDiscussion! one of the gametes is small and motile while other is large and non-motile. Both regularly alternate during the life cycle. The pattern of cell division may result in the formation of filament when the division is in single plane, e.g Some marine algae are multicellular and have relatively more or less dense inter-weaving pattern of filaments which has resulted in the formation of pseudoparenchymatous tissue e.g. In some algae, spores are regularly cut off at the exposed distal end of the protoplast in basipetal succession, called exospores. In some cases, certain adventitious branches are produced which break off from the parent body and develop into new plants. This type is known as colonies, and the form is colonial form or colony.The aggregate of cells in which the total number of divisions of component cell is fixed at the time of origin of the colony and is not increased later is called coenobium, and the form is known as coenobial form. By continuing to use this site, you consent to this policy.Botnam.com is participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Feb 29 2016. Deviating from the typical anisogamy, when the uniting gametes show morphological simila­rity with physiological difference, it is called physiological anisogamy. These spores are called These are thick walled spores formed during unfavorable conditions or even when food supply in abundant. Blue-green algae, any of a large, heterogeneous group of prokaryotic, principally photosynthetic organisms. Star-shaped aggregation of starch containing cells develops on the lower nodes of Chara. These are motile naked spores provided with two, four or many flagella and called as bi-, quadri- or multiflagellate zoospores, respectively. Conditions for sexual reproduction: (a) The sexual reproduction takes place after considerable accumulation of food material and the climax of vegetative activity is over. There are variations of it.The motile gametes taking part in fusion may either differ in size (morphological anisogamy) or physiological behaviour (physiological anisogamy).In this case, the male antherozoid fuses with the female egg. After sporophyte produces sporangium, which undergo meiosis. Due to deposition of haematochrome pigment in their walls, the hypnospores of Chlamydomonas nivalis are red in colour.

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