17. Mention the group of animals in which the following organs are found: (a)Radula (b)Compound eye (c)water vascular system (d)Closed circulatory system (e)Nematocysts (f)Flame cells (g)Visceral hump (h)Nephridia (i)Parapodia (j) Malpighian tubules
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The open circulatory system is common to mollusks and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
Hence Cockroach(ARTHROPODA), Prawn(ARTHROPODA), Silverfish(ARTHROPODA), Snail(MOLLUSCA) are examples for animals having an open circulatory system.
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A- (Q), B- (R), C- (S), D- (P)
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