Conversion of nitrogen into nitrates and nitrites through atmospheric, industrial and biological processes.

Conversion of nitrates to nitrogen is called....

Conversion of ammonia into a nitrite and then nitrate is called……..

Complete the analogy Nitrogen fixation: Nitrogen to nitrates and nitrites ::_________ : Ammonia into nitrite and then nitrate

Carbon dioxide is released into the atmosphere through…………

Find the odd man out Biological nitrogen fixation, ammonification, nitrification, denitrification, industrial nitrogen fixation

Oen litre of oxygen at a pressure of one atmosphere and two litres of nitrogen at a pressure of 0.5 atmosphere are introduced into a vessel of 1 litre capacity , with out any change in the temperature. The total pressure would be

…………..is produced from oxygen through various atmospheric processes.

Nitrogen forms………….% of the atmosphere.

Water is indispensable for life.What properties of water make it useful for all biological processes on the earth?

Read the following paragraph and answer the questions based on it. Rhizobium living in root nodules supply nitrates, nitrites and amino acids to that plant and in exchange get energy in the form of carbohydrates from it. Such a mutually beneficial relationship is called symbiosis. Rhizobium produce nitrogenous compounds from atmospheric nitrogen. However, for this process of nitrogen fixation, they need leguminous plants like beans, sweet pea, soyabean, etc. as ‘host’. Beans and pulses are rich in proteins due to the nitrogenous compounds made available by Rhizobium. After harvesting a leguminous crop, the left-over roots and other plant parts are deliberately dumped in farm soil to maintain its bacterial population. The use of Rhizobium has helped to reduce the use of chemical fertilizers and thereby their adverse effects. It has also helped to reduce expenses on fertilizers and thus works to the benefit of farmers. Why does left over roots and other plant parts are deliberately dumped in farm soil after harvesting a leguminous crop?