9th Class Science Sample Paper Sample Paper - 1 Term - 1

  • question_answer State some factors responsible for losses of grains during storage. Give one preventive measure to control such storage.    


    Factors responsible for losses of grains during storage are (i) Biotic factors These are insects, birds, rodents, mites and bacteria.                                                                    (1/2)         (ii) biotic factors These are moisture, humidity and temperature.                                                                              (1/2)                           Preventive and control measures are used before the grain are stored for future used. They include · Strict cleaning of produce before storage. ·  Proper drying of produce first in sunlight and then in shade. ·  Fumigation by using chemicals that can kill pests.             (2)  


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