Question

state two sources from which plant obtain nitrogen for the synthesis of protein and other compounds​

Answer 1

1)rhizobium bacteria fixes atmospheric nitrogen.
2)bodies of animals and plants contains nitrogen, when these r buried in the ground the nitrogen mixes in the soil, and thus used up by plants.
3)when lightening occurs , high temperature of light converts it into it's oxides, these gets mixed in water and forms rain,when this rain falls on ground the nitrogen in it gets mixed in the soil, and thus plants use it.

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Answer 2

see if we talk about insectivorous plants so they they get nitrogen from the flys they eat.and there is a bacteria named rhizobium which lives on the roots of leguminous plants. they convert the nitrogen into soluble form .