Define photoautotrophic and chemoautotrophic nutrition?
Answers
Sulphide) during photosynthesis for making ATP and NADPH through ETS (Electron Transport System). These two bioenergy molecules are further on utilized for CO2 fixation for making food. Therefore, photoautotrophs are also called Photolithoautotrophs.
Why photoautotrophs are also called Photo-lithoautotrophs?
They are called photolithoautotrophs due to following reasons:
1. They have ability to utilize light energy.
2. They have ability to use e– and H+ donor compounds of lither.
3. They use inorganic compound (CO2) for fixation to make food.
In case of plants, e– and H+ donor is 2H2O and after photolysis. There is production of oxygen which shows oxygenic photosynthesis. But in case of these bacteria, there is no utilization of H2O. So, release of O2 during this type of photosynthesis is absent. Therefore, is known as An-oxygenic photosynthesis.
Nutrition in Chemoautotrophs
Those bacteria which utilize chemical energy to utilize their food are called chemoautotrophs. To explain this, we can take example of Nitrifying bacteria present in the soil. They are involved in the conversion of
Nitrosomonas Nitrobacter
Nitrococcus Nitrocystis
NH3 ——————–> No2 ——————–> No3
Ammonia Nitrite Nitrate
At the end this is synthesis of Nitrate from Ammonia, that’s why these bacteria are also called as nitrifying bacteria.
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Chemoautotrophs prepare their food with the help of chemical.
Photoautotrophs are organisms that Carry out photosynthesis. Using energy from sunlight carbon dioxide and water are converted into organics material to be used in cellular function such as biosynthesis and respiration.