An alga which can be employed as food for human beings is

Statement $A$: Protein-rich food produced by microorganisms is called Single Cell Protein $(SCP)$.
Reason $R$: The production of Single Cell Protein causes environmental pollution.
Which option is correct for Statement $A$ and Reason $R$?

Statement $P$: Heterotrophic mushrooms are cultivated globally.
Statement $Q$: $A$ cow weighing $250 \, kg$ produces $200 \, g$ of protein per day.

$S$ - Statement: Heterotrophic mushrooms are cultivated globally.
$R$ - Reason: $A$ $250 \ kg$ cow produces $200 \ kg$ of protein daily.

Which alga is rich in protein?

Which of the following is grown on a global scale to obtain Single Cell Protein $(SCP)$?