Food grains can be stores in an atmosphere of ______ to protect them from insects.
Carbon dioxide
Explanation for correct option
Carbon dioxide can be used to preserve food grains from destruction by insects.
Explanation for incorrect option
Oxygen does not prevent insects from destructing food. Oxygen helps in respiration in animals and plants.
Hence the correct option is B
Food grains can be stored in an atmosphere of Carbon dioxide to protect them from insects.