By Dr. Ashok Kumar Dr. Ashok Bendre
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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. It produces many biflagellate antherozoids.
It is called Gongrosira because it looks similar to another algal member-Gongrosira. 3. In this stage, filament is divided into many, short and thick-walled parts. 4. Each of these parts is called akinete or cyst. 5. Akinetes are thick walled and rich in oil contents. 6. Akinetes occur in long chains, alternating with a part of filament. Work procedure Study a slide showing oogonia. Comments 1. 2. 3. 4. 5. 6. Exercise 3 Object : Study of antheridia. Work procedure More than one oogonium are present at the tip of the stalks which once again branch at their tips.
Isolate such filaments, stain in safranin, wash with water and mount in glycerine. Study the antheridia of macrandrous species. Comments 1. Antheridia are mostly intercalary in position. 2. Numerous antheridia form a long chain being arranged in a series. 3. An antheridium is a small and flat cell. 4. Each antheridium has two nuclei lying side by side, surrounded by dense cytoplasmic contents. Each of such protoplasmic groups later on metamorphoses into a multiflagellate antherozoid. Exercise 4 Object: Study of dwarf male or nannandrium.
A text book of practical botany 1 by Dr. Ashok Kumar Dr. Ashok Bendre