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Hello students, in this video i will be answering multiple questions related to the phylum mollusca.
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Philem mollusca includes a large and diverse group of invertebrates that share a number of key characters including soft body, a muscular foot, a mantle that may secrete a shell and a radula, which is a tongue -like organ covered with tiny teeth.
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The first question wants us to explain about the body symmetry in mollusks.
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Molesks have bilateral symmetry which means that their body can be divided into two similar halves along a single plane.
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The second question wants us to explain the unique structures of mollusks.
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Molesks have a unique structure called as mantle which is a thin layer of tissue that covers their body and secretes the shell in the body.
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In few species, they also have a muscular foot that is used for movement and attachment.
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They also have radula which is a tongue -like organ which is covered in teeth that is used for scraping foot.
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In the third question, we need to explain how mollusks feed.
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Molusks have a wide range of feeding strategies.
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Bivalves are filter feeders that extract food particles from water.
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Others like snails are grazers that feed on algae and other plant material...