Blue-green algae like $Spirulina$ can be grown on which of the following?

$A$: Proteins produced by microorganisms are known as Single Cell Proteins $(SCP)$.
$R$: The production of Single Cell Proteins causes environmental pollution.

Which bacterium has the capacity to produce $25$ tonnes of protein due to its high rate of biomass production and growth?

In biotechnological studies,the alga that is exploited as a rich source of protein is

Methylophilus methylotrophus is which type of organism?

Consider the following statements $(I-IV)$ and select the option containing the correct answer.
$I.$ The unicellular $Spirulina$ can produce large quantities of food rich in protein,minerals,and vitamins.
$II.$ Based on body weight,the microorganism $Methylophilus$ $methylotrophus$ can produce much more protein in a day than a cow.
$III.$ Common button mushrooms are a rich source of Vitamin-$C$.
$IV.$ $A$ variety of rice has been developed that is rich in calcium.