Download A text book of practical botany 1 by Dr. Ashok Kumar Dr. Ashok Bendre PDF

By Dr. Ashok Kumar Dr. Ashok Bendre

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Asexual reproduction takes place by biflagellate zoospores and non-flagellate tetraspores. Flagellated structures are typically pyriform in shape with two laterally inserted flagella. Sexual reproduction ranges from isogamy to oogamy. In oogamy, one to eight female gametes are released from oogonium. The antherozoids are uni-or biflagellate. Isomorphic or heteromorphic alteration of generations is also seen in many of the members of the group. Ectocarpus Classification Sub-division Class Order Family Genus Algae Phaeopbyceae Ectocarpales Ectocarpaceae Ectocarpus Exercise 1 Object : Study of external features of thallus.

The medulla transports water and essential nutrients. Hence, it is a also called as conducting region. Exercise 2 Exercise 3 Object : Study the internal structure of axis. Object : Study of internal structure of leaf. Work procedure Work procedure Place a small piece of axis in the pith after removing the leaves. , stain in safranin and mount in glycerine to study the internal structure. , stain in safranin and mount in glycerine to study the internal structure. Algae Fig. 5. Sargassum. s. through conceptacle.

1) Valves circular, polygonal or irregular in outline, (2) Ornamentation radial or concentric about a central point, (3) Raphe or pseudoraphe absent. Order-2-Pennales. (1) Valves bilaterally symmetrical or asymmetrical in surface view, (2) Ornamentation always bilaterally symmetrical with respect to a line, (3) Raphe and pseudo-raphe present. Hints for Collection Fig. 3. Triceratium. Part of the wall magnified. The diatoms are cosmopolitan in distribution being present in almost all the habitats.

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