This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The cookie is used to store the user consent for the cookies in the category "Analytics". These cookies ensure basic functionalities and security features of the website, anonymously. Necessary cookies are absolutely essential for the website to function properly. Principles of Inheritance and Variation.New Questions and Answers and Forum Categories Most photoautotrophs live near the bottoms of ponds and lakes where reduced sulphur or other compounds are in plenty and oxygen content is very low. Instead sulphur compounds like hydrogen sulphide (H 2S), hydrogen gas (H 2), thiosulphates (Na 2S 20 3) or some organic compounds are used to obtain reducing power. Photoautotrophs carry out anoxygenic photosynthesis in which water is not used as reducing power. The purple bacteria possess pigment bacteriochlorophyll located in the membranes of thylakoids while green bacteria possess bacteriophaeophytin (chlorobium chlorophyll) located inside small sacs called chlorosomes. These bacteria are anaerobic, which could be purple or green. They use solar energy for the synthesis of their own food. (i) Photoautotrophic bacteria (Photoautotrophs): ![]() (ii) chemoautotrophic (chemosynthetic) which utilize chemical energy. (i) photoautotrophic (photosynthetic) which make use of light energy and They synthesize their own organic food from inorganic substances (CO 2 and hydrogen donor) Autotrophic bacteria are of two types: coli in water supply indicates contamination by sewage. ![]() It feeds on undigested matter, checks the growth of putrefying bacteria and produces vitamins B and K. Escherichia coli live in human intestine as commensal. Bacteria fix atmospheric nitrogen for the plant and in return get protection. leguminosarum, live in the root nodules of leguminous plants forming intimate symbiotic relationship. They live in symbiotic association with other plants for mutual benefit.
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