By H. D. Kumar, H. N. Singh (auth.)
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Additional resources for A Textbook on Algae
Alginates are extensively uscd as thickeners in the cosmetic, textile and pharmaceutieal industries, and as emulsifying agents in the preparation of poJishes and paints. AGAR-AGAR A jelly-Jike substance, agar-agar (often called simply agar), is a complex polysaccharide of great economic value. It is extracted in water from certain species of red algae belonging to Gelidium, Graci/aria and other genera whieh produce and store it along with cellulose in their cell walls. The most extensive use of agar is aS'a base for culture media for algae, fungi, bacteria and tissues.
With the advent of unfavourable conditions the ordinary vegetative cells die whereas the akinetes successfully endure the harsh c1imate. When favourable conditions recommence during the next spring or rainy season. , Pithophora. Gloeotrichia and Cylindrospermum (Fig. 3-6 A). Akinete formation is widespread in the nitrogen-fixing blue-green alga, Aulosira /ertilissima. which occurs abundantly in tropical rice fields. Here, the vegetative filaments become transformed into chains of akinetes (spores) when the stagnant water in the fields begins to dry up, and it is in this sporulating condition that the alga tides over dry and hot periods.
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.
A Textbook on Algae by H. D. Kumar, H. N. Singh (auth.)
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