Classify phylum Mollusca up to class level and mention characteristic features of each class with relevant examples. (UPSC 2024, 15 Marks, )

मोलस्का संघ को वर्ग स्तर तक वर्गीकृत करें और प्रत्येक वर्ग की विशेषताओं का उल्लेख करें, साथ ही प्रासंगिक उदाहरण दें। (Classify phylum Mollusca up to class level and mention characteristic features of each class with relevant examples.)
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Introduction
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Shell diversity in Mollusca (UPSC 2023, 8 Marks, )

मोलस्का में शंख विविधता (Shell diversity in Mollusca)
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Introduction
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Elucidate the structural diversity of shells in molluscs. Also, write their functions. (UPSC 2019, 8 Marks, )

मोलस्क में शंखों की संरचनात्मक विविधता को स्पष्ट करें। साथ ही, उनके कार्यों को लिखें। (Elucidate the structural diversity of shells in molluscs. Also, write their functions.)
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Introduction
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