Question

What is spiraled around the inside of Spirogira

Answer 1

Spirogyra is also known as pond silk, as its filaments shine like silk due to the presence of mucilage. The outer cell wall has pectin which dissolves continuously, thereby producing the mucilage. Spirogyra filaments are slippery and float in large masses.

Spirogyra is a genus of green algae that belong to the order Zygnematales. These free-flowing, filamentous algae are characterized by ribbon-shaped chloroplasts that are arranged in a helical manner inside the cells. So the name is derived from the spiral arrangement of chloroplasts in these algae. This feature is unique to this genus, which has around 400 species.

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Answer 2

Spirogyra is a large genus. It is widely distributed and found throaghout the world. It has of about 300 species. It is found in fresh water. It grows as free floating mass. Therefore, it is commonly called pond scum. It commonly grows in fresh water stagnant reservoirs. It also grows in slow running streams and rivers. It looks like a mass of long shining silky filaments in running water. That is why it is also called pond silk. Suitable season for its growth is winter. But it grows well throughout the year. It develops reproductive stage if temperature rises. It develops vegetative stage if temperature lowers.
Spirogyra looks like a long, cylindrical tube, with green threads working their way around the inside, forming what seems to be a 'double helix' with itself.Spirogyra is named due spiral arrangement of chloroplast. Pyrenoids are attached with the chloroplast. They are arranged linearly On the chloroplasts at intervals.
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