Phylum Mollusca
Phylum Mollusca is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2017, 2023). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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वर्गीकरण तत्त्वानुसार कोणते वर्गीकरण योग्य आहे ? Which is the correct group from the taxonomic point of view ?
Phylum Mollusca includes organisms like Pila (apple snail), Dentalium (tusk shell), and Sepia/Cutlefish, as well as forms like 'Dentalium/olas' (often spelled as 'Dentalium' or similar mollusks). Thus, 'फोलास, पायला, कटलफिश' represents a correct taxonomic group of Mollusca.
मोलुस्का वर्गीय प्राणी मृदूकाय असतात आणि ते खालील वैशिष्ट्ये धारण करतात : Phylum Mollusca contains soft bodied animals characterized of : वरीलपैकी कोणते विधान/विधाने बरोबर आहेत ? Which of the statements given above is/are correct ?
(a)ते प्राणीसृष्टीमधील दुसरा सर्वात मोठा वर्ग आहे / They are second largest phyllum in animal kingdom
(b)सर्वसाधारणपणे ते द्विपक्षीय सममितीय असतात / They are generally bilaterally symmetrical
(c)ते फक्त जमीनीवरच राहातात / They are only Terrestrial animals
(d)त्यांना मांसल पाय असतात / They are having muscular foot
Molluscs are the second largest phylum of invertebrate animals. They are bilaterally symmetrical, triploblastic, and possess a muscular foot for locomotion, but they are not exclusively terrestrial as many are aquatic (marine and freshwater).