KVPY SB SX Exam 2011 Question Paper

Question : 113 of 120

Marks: +1, -0

Rodents can distinguish between many different types of odours. The basis for odour discrimination is that

they have a small number of odorant receptors that bind to many different odorant molecules
the mechanoreceptors in the nasal cavity are activated by different odorant molecules found in the air passing through the nostrils
the part of the brain that processes the sense of smell has many different receptors for odorant molecules
a large number of different chemoreceptors are present in the nasal cavity that binds a variety of odorant molecules

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