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 :
In Herdmania special sensory organs are lacking. However, several simple structure isolated or aggregated cells with nerve endings represents the receptors nerve, especially in the test and the siphons. The receptors are - (i) Red pigmented spots on the test are photoreceptor being sensitive to light (ii) Sensory cells of the test margins of siphons and tentacles are tangoreceptors being sensory to current. (iii) The cells on the margins of siphons are rheoreceptors because they are sensitive to water current. (iv) Cells lining the siphons are thermoreceptor, they are sensitive to changes of temperature. (v) Dorsal tubercle function as olfactory and gustatory organ.
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