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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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9. Small chromatophores are also scattered in the cytoplasm. They are circular or elliptical in shape. Pyrenoids are absent. 10. The reserve food material is in the form of small oil droplets. 5. 6. 7. 8. Exercise 2 Object : Study of Gongrosira stage. generally sessile but a stalk-like structure is present in a few species. Antheridia are terminal. These are strongly curved, hook-like and cylindrical. Antheridia are cut off from the main filament by a transverse septum at its base. Protoplast accumulates towards the centre.

Zygote is thick-walled post-fertilization structure. The wall is generally three layered. 2. The layer outside the innermost may be smooth, ornamented or verrucose. 3. Zygote develops red colour due to the accumulation of reserve food in the form of reddish oil drops. Identification Sub-division-Algae. (1) Thallus filamentous, (2) Chlorophyll present, (3) Cell wall of cellulose. C/ass--Cblorophyceae. (I) Chloroplasts grass-green, (2) Photosynthetic reserve-starch, (3) Motile structures flagellated, (4) Flagella equal in length.

1) Cells single and non-motile, (2) Cells uninucleate, (3) Method of reproduction-zoospores or autospore fonnation. Family-Chlorellaceae. (1) Cell single, if united do not fonn a definite colony, (2) Reproduction by autospores. Genus-Chwrellll. (1) Cells solitary and spherical with smooth walls, (2) Single chloroplast. Hints for Collection It is free living and is found in stagnant and running waters. It also grows within the cells or tissues of invertebrates. C. parasitica (Zoochlorella) is found in Ophrypodium spongilla, etc.

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