Name an organism that produce cry protein. How has man exploited this protein to his benefit?

What are Cry proteins? Name an organism that produces them. How has man exploited this protein to this benefit?

SCP is an alternate source of protein. Name two microbes used in SCP productions.

How are crystal proteins useful in agriculture ?

250 kg cow produces 200 gm protein /day. In same period 250 gm of methylophilus methylotrophus produces 25 tonnes of protein. Then what is single cell protein?