Characteristics of Spirogyra: (a) Spirogyra occurs in freshwater bodies such as ditches, ponds, lakes, etc. The thallus is unbranched or unattached. It is also identified as pond silk, as its fiber burnishes like silk due to the occurrence of mucilage. However, some workers have also reported asexual reproduction in Spirogyra through akinetes and aplanospore formation. Note any changes in the algae cell structure. Zygospores are the only diploid stage in the life cycle of Spirogyra. Z. Kadłubowska published Structure of the cell-wall in Spirogyra silesiaca Kadł. Pyrenoids store starch and protein, The vegetative filament after fragmentation develops into a new filament. At the time of germination, the zygospore undergoes meiosis to form 4 haploid (n) nucleus, of which only one survives and others disintegrate. Under the favourable conditions, vegetative reproduction is the preferred mode of reproduction. Activity - To observe the structure of Spirogyra. The cell wall is. Before learning about its structure, check out this spirogyra diagram, where one cell has been magnified to point out its various parts. In sedentary species, basal differentiation may occur in the form of an attachment organ, called holdfast or haptera. Spirogyra is an aquatic plant. For example, although no such serious diseases are found to be caused by them, it can spoil drinking water, and also its abundant growth in the water bodies can cause nuisance in swimming and fishing. Each of the spirogyra cell s is rectangular in shape surrounded by two common layers i.e. Filamentous green algae on white background. Vegetative reproduction is by fragmentation. When looking at the amoeba under the microscope it had protrusions coming out of it, the pseudopodium, that helps in shape changing. spirogyra under microscope Reproduction in Spirogyra. Although they thrive to grow in nutrient-rich environments, Spirogyra produces their own food using the green pigment chlorophyll and sunlight through photosynthesis, thus performing an autotrophic mode of nutrition. Spirogyra is a chlorophyllous alga. There are many vacuoles. The cells are also elongated, cylindrical in shape. Rui‐Hua Liu. The pectose layer dissolves in water to form a slimy mucilage sheath covering the whole filament. Vegetative Reproduction. The spirogyra has more structured shape, whereas the amoeba has hardly any structure shape to it. ADVERTISEMENTS: Read this article in Hindi to learn about the structure of spirogyra, explained with the help of a suitable diagram. During unfavorable growth conditions, the cytoplasmic content of the cell shrinks and looses water, developing a hard covering around the cell, resulting in the formation of spores. Spirogyra. (a)Pyrenoids holds the nucleous in spirogyra and nucleous is at one side. (c) It consists of number of cylindrical cells placed one above the other and the filament is covered over by mucilage. Characteristics of Spirogyra: (a) Spirogyra occurs in freshwater bodies such as ditches, ponds, lakes, etc. Structure of Spirogyra The vegetative structure or plant body is known as thallus. There is a single large nucleus which is suspended in the cytoplasm. Spirogyra is classified under Chlorophyta due to the presence of chlorophyll. The cell membrane is bounded by protoplasmic mass of the cell. Similar to plants, during daytime Spirogyra takes in carbon dioxide dissolved in water to release a relatively large volume of oxygen using specialized cells called stomata. The slimy mucilage sheath is due to the dissolution of pectose in water, In each cell, there is a nucleus, cytoplasm, a large central vacuole and spiral chloroplasts, Chloroplasts are ribbon-shaped and arranged spirally. 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