By H. D. Kumar, H. N. Singh (auth.)
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Additional resources for A Textbook on Algae
Oedogonium, Vaueheria). During zoospore formation in Oedogonium, the entire protoplast assumes a pear shape and escapes from the cell and develops a ring of ftagella around a colourless circular area towards its anterior end. , C/adophora, the protoplast of a cell may give. rise to 8, 16, 32, 28 A TEXTBOOK ON ALGAE or more zoospores by undergoing repeated divisions either after the completion of aH nuclear divisions (simultaneous division) or after each nuclear division (successive division).
4. How does the sexuality in eucaryotic alpe differ from that in bacteria ? S. Why are isogamy, anisogamy and oogamy regarded as progressive stages in the evolution of gametes in algae ? 6. What is the evolutionary significance ofthe algae with heteromorphie life cycle? REPRODUCTION AND PERENNATION 7. 37 Occasionally, when gametes fai! to fuse, they may direct1y give rise to new plants. What is its significance in relation to the origin of sex in algae ? SELECTED REFERENCES Allen, R. , The moment of fertilization, Sclem.
Other conspicuous places include tree barks, rocks and stones, footpaths and plant pots. The blue-green algae form a significant part of the free-floating population of microscopic organisms wh ich constitute the plankton of eutrophie (organically rich) lakes and oceans. They are also found in the benthos of lakes and ponds and are largely responsible for the high fertilizing qualities of bottom muds of dried ponds and tanks. In tropical countries the ponds that are heavily polluted and exposed to high temperatures and intense sunlight, provide optimum conditions for the growth of blue-green algae.
A Textbook on Algae by H. D. Kumar, H. N. Singh (auth.)