By H. D. Kumar, H. N. Singh (auth.)
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Extra resources for A Textbook on Algae
Hypothetical diagram iIIustrating how sex might have originated in such forms as Ulothrix. Note the four types of swarmers (indicated by different kinds of arrows) and their fate, and also the relative sizes of the germlings produced. copulate in pairs to form tbe zygote whose division products ultimately develop into new plants. How a mere variation in size can account for such a fundamental difference in their behaviour is tbe basic question. Tbe larger zoospores contain the minimum level of factors tbat help them grow individually into new plants.
Others live symbiotically in diverse unicellular animals. In nature, they interact with and affect the behaviour of a wide variety of diverse procaryotic and eucaryotic organisms. THALLUS ORGANIZATION AND RANGE OF FORMS Unicellular, colonial (palmelloid), filamentous and heterotrichous forms are (ommon but more elaborate macroscopic thalli are rare. The products of cell division, instead of being liberated as distinct individuals, often remain united in an assemblage of cells (a colony). , Aphanolheee).
Explain. 2. Which of the following parts of an algal cell is alive: cell wall, protoplasm, vacuole? 3. Differentiate between a chloroplast and a chromatophore and justify the suggestion that variation in the external morphology of chromatophores is of IiUle significance in the phyletic classification of algae. 4. Discuss the statement that electron microscopy has in no way alte red the primary basis of c1assification of algae as previously emphasized by light microscopy. 5. What arguments can you offer in favour of the view that unicellular flagellates are the most primitive forms of green algae?
A Textbook on Algae by H. D. Kumar, H. N. Singh (auth.)