question_answer 50)

  When a person is suffering from severe cold, he or she cannot (a) differentiate the taste of an apple from that of an ice cream (b) differentiate the smell of a perfume from that of an agarbatti (c) differentiate red light from green light (d) differentiate a hot object from a cold object.

Answer:

                    (b) During cold, mucus in nasal passages becomes too thick, so that odour mole culescan't reach the olfactory receptor cells. Thus, brain receives no signal identifying the odour, and so the smell of a perfume cannot be differentiated from that of an agarbatti.