Question

short note on spirogyra​

Answer 1

Explanation:

short note on spirogyra

• Spirogyra, member of a genus of some 400 species of free-floating green algae (division Chlorophyta) found in freshwater environments around the world. Named for their beautiful spiral chloroplasts, spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells. They can form masses that float near the surface of streams and ponds, buoyed by oxygen bubbles released during photosynthesis. They are commonly used in laboratory demonstrations.

Answer 2

Answer:

Spirogyra are free-floating green algae present in freshwater habitats such as ponds, lakes, etc. Spirogyra are commonly known as “water silk or pond silk”. They have a filamentous and unbranched vegetative structure. There are around 400 species of Spirogyra found. The genus Spirogyra is named after the unique spiral chloroplast present in the cells of algae.

Spirogyra are photosynthetic and contribute substantially to the total carbon dioxide fixation carried out. They increase the level of oxygen in their habitat. Many aquatic organisms feed on them.

Structure of Spirogyra

1. The vegetative structure of Spirogyra is an unbranched filamentous thallus
3. The thallus is multicellular with each cylindrical cell joined end to end
5. They are 10-100 µm in width and may grow several centimetres in length
7. They are present as a slimy mass due to the presence of mucilage sheath around the filament
9. The cell wall is made up of two layers, inner cellulose and outer pectose. The slimy mucilage sheath is due to the dissolution of pectose in water
11. In each cell, there is a nucleus, cytoplasm, a large central vacuole and spiral chloroplasts
13. Chloroplasts are ribbon-shaped and arranged spirally. There may be 1-16 chloroplasts present in a cell
15. Chloroplast contains many pyrenoids in a row. Pyrenoids store starch and protein

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