Question:
In Aulosira, Tolypothrix and Nostoc, _______ are the sites for nitrogen fixation.
In Aulosira, Tolypothrix and Nostoc, _______ are the sites for nitrogen fixation.
Updated On: Jul 18, 2024
- vesicles
- arbuscles
- akinetes
- heterocysts
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The Correct Option is D
Solution and Explanation
Many cyanobacteria are free living and filamentous such as Aulosira, Tolypothrix, Nostoc, etc. These cyanobacteria have some specialised and colourless cells, called heterocysts which are the sites of nitrogen fixation.
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Concepts Used:
Biological Classification
The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:
