Question

What is meant by torsion? Explain the process in detail

Answer 1

Torsion (twisting) is the rotation of visceral organs in anticlockwise direction through an angle of 180° on the rest of the body during larval development. The phenomenon takes place in the free-swimming (veliger) larva of gastropods and converts the symmetrical larva into an asymmetrical adult.

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Answer 2

Tᴏʀsɪᴏɴ ɪs ᴀ ɢᴀsᴛʀᴏᴘᴏᴅ sʏɴᴀᴘᴏᴍᴏʀᴘʜʏ ᴡʜɪᴄʜ ᴏᴄᴄᴜʀs ɪɴ ᴀʟʟ ɢᴀsᴛʀᴏᴘᴏᴅs ᴅᴜʀɪɴɢ ʟᴀʀᴠᴀʟ ᴅᴇᴠᴇʟᴏᴘᴍᴇɴᴛ. Tᴏʀsɪᴏɴ ɪs ᴛʜᴇ ʀᴏᴛᴀᴛɪᴏɴ ᴏғ ᴛʜᴇ ᴠɪsᴄᴇʀᴀʟ ᴍᴀss, ᴍᴀɴᴛʟᴇ, ᴀɴᴅ sʜᴇʟʟ 180˚ ᴡɪᴛʜ ʀᴇsᴘᴇᴄᴛ ᴛᴏ ᴛʜᴇ ʜᴇᴀᴅ ᴀɴᴅ ғᴏᴏᴛ ᴏғ ᴛʜᴇ ɢᴀsᴛʀᴏᴘᴏᴅ. Tʜɪs ʀᴏᴛᴀᴛɪᴏɴ ʙʀɪɴɢs ᴛʜᴇ ᴍᴀɴᴛʟᴇ ᴄᴀᴠɪᴛʏ ᴀɴᴅ ᴛʜᴇ ᴀɴᴜs ᴛᴏ ᴀɴ ᴀɴᴛᴇʀɪᴏʀ ᴘᴏsɪᴛɪᴏɴ ᴀʙᴏᴠᴇ ᴛʜᴇ ʜᴇᴀᴅ.