00:01
Have in this answer we are going to select an option that correctly describes how nitrogen fixation helps in the enhancement of plant growth.
00:15
So nitrogen which is readily available in the atmosphere cannot be used by the plants.
00:22
It needs to be converted into usable forms such as nitrites nitrates ammonia etc in order for the plants to use it.
00:31
So this process, process wherein the atmospheric nitrogen is converted into usable forms is called as nitrogen fixation.
00:42
So option a which says nitrogen fixation prevents the pathogens from infecting the plants is a wrong option because pathogens can be prevented by certain structures in the plants such as the epidermis which is covered by a waxy substance called as the cuticle.
01:05
And certain chemicals are produced by the plants which acts as toxins.
01:10
They are called as phytoelectins.
01:14
So these things help the plants to prevent themselves from the invasion of pathogens.
01:22
So option a is a wrong option.
01:25
Coming to option b, which says nitrogen fixation by plants, is expensive in terms of metabolic energy is a wrong option because plants they lack an enzyme called as nitrogenase which is required for nitrogen fixation which is available in microorganisms...