Phylum Mollusca

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What is Phylum Mollusca?

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Phylum Mollusca is a diverse group of invertebrate animals that includes snails, clams, octopuses, and squids, characterized by a soft body, often protected by a hard shell.

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What are the main classes of Mollusca?

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The main classes of Mollusca include Gastropoda (snails and slugs), Bivalvia (clams and oysters), Cephalopoda (octopuses and squids), and Polyplacophora (chitons).

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What is the function of the radula in mollusks?

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The radula is a tongue-like organ with tiny teeth used by many mollusks to scrape food off surfaces.

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What is the role of the siphon in mollusks?

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The siphon is a tubular structure used by mollusks to draw in water and expel it, aiding in respiration and locomotion.

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How do cephalopods differ from other mollusks?

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Cephalopods have a closed circulatory system, advanced nervous system, and are known for their ability to change color and texture.

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What is nacre and its significance in mollusks?

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Nacre, also known as mother-of-pearl, is a substance secreted by mollusks to form pearls and the inner layer of their shells.

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What are the characteristics of bivalves?

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Bivalves have two shells (valves), a filter-feeding system, and lack a radula.

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What is the ecological importance of mollusks?

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Mollusks play crucial roles in ecosystems as grazers, predators, and prey, and are indicators of environmental health.

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What adaptations do nudibranchs have for defense?

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Nudibranchs use stinging cells from their prey for defense and can display bright colors as a warning to predators.

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What is the significance of the closed circulatory system in cephalopods?

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The closed circulatory system in cephalopods allows for more efficient gas exchange and supports their active lifestyle.