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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A part of thallus showing mode of branching. rhizoidal cell single cell holdfast cell wall Fig. 3. Cladophora. Basal part of the filament with holdfast. 5. Branches arise just beneath the septum, from the upper end of the cell. Object Exercise 2 Study a cell. Work procedure Use the same slide prepared earlier and study the structure of a single cell. Comments 1. Cell walls are stratified being composed of three layers, out of which middle is conspicuously stratified. 2. A cell is coenocytic. Central region is occupied by a large vacuole, surrounded by outer cytoplasmic lining in which many nuclei are Fig.

Co1eochaete sp. Cushionoid thallus. surroUllded partly or wholly by a gelatinous sheath at the base. 6. The thallus is distinctly enveloped by a gelatinous sheath or mucilage. 7. In discoid species cells of the thallus are joined end to end to form branches. These branches are laterally apposed to one another to form a pseudoparenchymatous disc. 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.

Erect portion is a crowded tuft of branches. Main axis is broad from which lateral branches arise just beneath the septum and taper into a point. Ultimate branches give an appearance of a hair. Work procedure Mount a few filaments in glycerine after staining in safranin. Study the structure of thallus and also a single cell. Comments 1. Thallus is multicellular, filamentous and branched. 2. Filaments are heterotrichous and differentiated into (i) prostrate portion and (ii) an erect portion. 3. In some species prostrate portion is irregularly and profusely branched or altogether absent.

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