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

By Dr. Ashok Kumar Dr. Ashok Bendre

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Exercise 4 Object bladder. s. through swollen air bladder, stain the section in safranin, mount in glycerine and study the internal structure. -fHffi":r air cavity ~:~~-~,''''-''. ~... 1 Fig. 4. Sargassum. s. leaf (diagrammatic). Fig. 6. Sargassum. s. through air bladder. Algae Comments 1. Air bladder appears circular in outline. 2. It is enveloped by a distinct mucilage. 3. s. shows outermost meristoderm, followed by cortex and the central air cavity. 4. Meristoderm is made of radially elongated thin walled cells.

Rhizoidal outgrowths come out from the basal part of the thallus. 4. The fllaments are profusely branched. Branching is lateral but appears dichotomous because of evection (process of pushing the main axis on one side during the development of lateral branches). Hints for Collection This alga occurs in large quantities in pennanent pools or other bodies of stagnant water. It fonns an extensive net which covers the entire surface of water reservoir, and is as such called 'water net'. ICladophora I Classification Sub-division Class Order Family Genus Algae Chlorophyceae Cladophorales Cladophoraceae Cladophora Fig.

8. Each cell is uninucleate. It has single, large, laminate and parietal chloroplast with a single pyrenoid. Rest of the cell is occupied by the cytoplasm. Exercise 2 Object : Study the reproductive structures. Work procedure Scrape out a few thalli from surface of aquatic weed. Observe under the microscope to see if spermocarps are present. Select such a thallus, stain in safranin, wash in water and mount in glycerine. Study the structure. Fig. 4. Co1eochaete sp. Thallus with sperrnocarps. Comments 1.

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