What is primarily obtained from mushrooms as a food source?

The advantages of single cell proteins are:
$I$. Easy to grow
$II$. Nutrient rich
$III$. High yield
Choose the correct option.

Which approach of genetic engineering is considered important for reducing environmental pollution?

Which microorganisms are used in the production of Single Cell Protein $(SCP)$?

Single Cell Protein $(SCP)$ is obtained through which process?

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.