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 :
The annelidan characteristics are- (i) Vermiform body with truncated extremities (ii) Absence of a true head (iii) Locomotion slows by peristalsis as in an earthworm (iv) Structure of eye is simple (v) Presence cilia in the excretory and reproductive ducts The arthropodan characteristics are- (i) Presence of antenna (ii) Jaws are modified appendages (iii) Locomotion by definite legs (iv) Cuticle has a thin deposit of chitin like that of arthropodan Molluscan characteristics are (i) Peripatus was previously included with molusca due to slug like appearance of its body and ladder like nervous system Onycophora have both annelidan and arthropodan characteristics. Therefore they are regarded to be an intermediate stage or connecting link between annelida and arthropoda.
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