What is polyembryony and how can it be commercially exploited?

What is polyembryony? How can it be commercially exploited?

What is reverberation ? How can it be reduced ?

What is ohm's law? How can it be verified?

How is aniline prepared commercially ?

Give two examples where the organism involved are commercially exploited in agriculture.

What is mutualism? Mention any two examples where the organisms involved are commercially exploited in agriculture.

What is power of lens? Give commercial unit of power?