What is primarily obtained from mushrooms as a food source?

How much protein does a $250 \ kg$ cow produce per day (in $g$)?

Single cell protein is an alternative protein source for animal and human nutrition formed from certain beneficial microorganisms like

Which of the following is an algal source of $SCP$?

$(A)$ The shift from grain to meat diets creates more demands for cereals. Why?
$(B)$ $A$ $250 \ kg$ cow produces $200 \ g$ of protein per day, but $250 \ g$ of $Methylophilus \ methylotrophus$ can produce $25 \ \text{tonnes}$ of protein. Name this emerging area of research. Explain its benefits.

Which type of microorganism produces $250$ grams of protein in a single day?