A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: A
Solution :
Pila is adapted to lead an amphibious life, that is it lives both in air and water. To carry on with these two modes of respiration efficiently and successfully, the animal possesses a gill or ctenidium for aquatic respiration and a pulmonary sac or lung for aerial respiration. Left and right nuchal lobes act as accessory structures. Aquatic respiration takes place when the snail is at the bottom or is floating or lying suspended in midwater or attached to plants and weeds in water. Aerial respiration is observed when the animal is in water or on land
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