The exudation of xylem sap drops on the edges of leaves is called

Assertion $\left(\mathrm{A}\right):$ Free-living bacteria such as Rhizobium and Frankia can help in the biological fixation of dinitrogen in the roots of angiospermous plants.

Reason $\left(\mathrm{R}\right):$ Prokaryotes exclusively contain nitrogenase enzyme which can catalyze the oxidation reaction of dinitrogen to glutamate.

The correct answer is:

Rhizobium forms a symbiotic association with roots in legumes and fixes atmospheric nitrogen. Which of the following statement is correct about this process?

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Nodule formation involves a sequence of multiple interactions between _____ bacteria and the roots of the host plant. (Azotobacter, Clostridium, Rhizobium)

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The process which involves conversion of nitrates and nitrites into ammonia, nitrogen oxide and nitrogen is called _____. (denitrification, nitrification, ammonification)

In the given diagram A and B represent:

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_____ is the most important source of nitrogen to the plant. (Ammonia, Nitrate, Nitrite)

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A haemoglobin like compound is synthesised in the root nodules of pea plants called _____. (leghaemoglobin, carotenoid, phycobilin)

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The process of converting ammonia to nitrate is known as _____. (ammonification, denitrification, nitrogen fixation, nitrification)