Nitrogen Cycle

Read the following statements and select the incorrect ones. (i) The co-ordinated activities of the legume and Rhizobium bacteria depend on chemical interactions between the symbiotic partners. (ii) Leguminous roots secrete chemical attractants that attract Rhizobium bacteria living nearby. (iii) N, P and K usually do not get deficient in soil due to their low plant requirement (iv) Nitrogen cycle is regular circulation of nitrogen amongst living organisms with its reservoir pool in lithosphere and cycling pool in atmosphere.

Nitrogen is

The process of nitrogen cycling by microbes involves multiple steps of oxidation and simultaneous reduction. The following reaction occurring during one such step is brought about by which bacteria? 2NO_2^- + O_2 to 2NO_3^_

In carbon-nitrogen nuclear fusion cycle, protons are fused to form a helium nucleus, positrons and release some energy. The number of protons fused and the number of positrons released in this process respectively are

Nitrogen byproduct of ornithine cycle is found minimally in

Calculate the number of nitrogen molecules present in 2.8 g of nitrogen gas.

Nitrogen comprises 78 percent of the atmosphere , the source of this atmospheric nitrogen is due to

Assertion : Catenation tendency is weaker in nitrogen. Reason : Nitrogen exists as diatomic gas.

The enzyme that can split a nitrogen molecule during nitrogen fixation is:

Which of the following can use elemental nitrogen as their nitrogen source