39. Name the only class of mollusks that have a well-developed nervous closed ci

Question

39. Name the only class of mollusks that have a well-developed nervous closed circulatory system system, complex eyes and a 40. Which of the following have the unique ability to secrete and deposit a ca "mother of peart" around foreign particles that enter the mantle cavity calcareous nacre or a. Squids and cuttlefish b. Snails and slugs c. Oysters and mussels d. None of these 41. The characteristic features of Chordata are: a. A notochord b. A dorsal hollow nerve cord c. Pharyngeal slits and a post-anal tail d. All of these 42. Members of the phylumhave bilaterally symmetrical larvae but exhibit secondary radial symmetry as adults, usually organized around five rays or "arms" a. Arthropoda b. Chordata c. Echinodermata d. Mollusca e. Annelida 43. Echinoderms are more closely related to the phylumthan any other phylum. a. Chordata b. Cnidarian c. Annelida d. Mollusca e. Porifera

Explanation / Answer

39. Cephalopoda is the class of mollusks that have a well developed nervous when, complex eyes and a closed circulatory system. Example include octopus etc., they have largest relative brain size among all the invertebrates. Their eyes are similar to vertebrate eyes with are separately evolved. They show complex behavior patterns.

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