Answer each question in 'one ' sentence only :
Given the meaning of Nif gene.

Answer each question in 'one ' sentence only : Name the aquatic fern commonly used paddy field as a biofertilizer.

Answer in 'one' sentence only : (i) Define 'mutation breeding "

Answer the following questions in one sentence each : State the number of electrons in the L shell of lithium.

Answer the following questions in one sentence each : State the number of electrons in the M shell of argon.

Answer the following questions in one sentence each : State the number of electrons in the K shell of helium.

Answer the following questions in one sentence each : Write the electronic configuration of chlorine.

Answer the following questions in one sentence each : Write the electronic configuration of oxygen.