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.    

    Answer:

    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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