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Question
Pyrenoid is found in which one of the following organs in Spirogyra?
Pyrenoid is found in which one of the following organs in Spirogyra?
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Solution
The correct option is C Chloroplast
- Pyrenoids are found in the chloroplasts of many algae, and in a single group of land plants, the hornworts.
- Pyrenoids occur in many of the algae and are associated with the chloroplasts. Some of them are known to contain Rubisco, the enzyme that catalyzes the incorporation of inorganic CO2 into carbohydrate. In these algae, pyrenoids probably function to fix carbon. In other algae, pyrenoids are the sites of carbohydrate (typically starch) storage. Starch and iodine react to produce a deep blue-black colour, so staining a thin algal prep with iodine will indicate the presence of pyrenoids.
- Spirogyra is a filamentous green alga in which the chloroplast has a characteristic spiral shape. In this photograph, you can see the chloroplast coiling against the outer edge of the cells. The numerous small round blobs along the edges of the chloroplast are the pyrenoids. The larger, faint blobs (they look like out-of-focus regions) that take up most of the volume of the cells in the filaments on the right are the nuclei, which are suspended in the interior of the cells.
Hence the correct option is C.
- Pyrenoids are found in the chloroplasts of many algae, and in a single group of land plants, the hornworts.
- Pyrenoids occur in many of the algae and are associated with the chloroplasts. Some of them are known to contain Rubisco, the enzyme that catalyzes the incorporation of inorganic CO2 into carbohydrate. In these algae, pyrenoids probably function to fix carbon. In other algae, pyrenoids are the sites of carbohydrate (typically starch) storage. Starch and iodine react to produce a deep blue-black colour, so staining a thin algal prep with iodine will indicate the presence of pyrenoids.
- Spirogyra is a filamentous green alga in which the chloroplast has a characteristic spiral shape. In this photograph, you can see the chloroplast coiling against the outer edge of the cells. The numerous small round blobs along the edges of the chloroplast are the pyrenoids. The larger, faint blobs (they look like out-of-focus regions) that take up most of the volume of the cells in the filaments on the right are the nuclei, which are suspended in the interior of the cells.
Hence the correct option is C.
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