A) radulla
B) thorax
C) mantle
D) abdomen
Correct Answer: C
Solution :
A hard calcareous shell is secreted by mantle. It is generally external but can be internal. The shell may even be reduced or absent. Mantle (pallium) is a thin, fleshy fold or outgrowth of dorsal body wall more or less covers the body. It encloses a space, the mantle or pallial cavity between itself and the body. Radula is a rasping organ present in the buccal cavity. It takes part in feeding. For this, it is fibre-like with transverse rows of teeth. Abdomen is the portion of a tetrapods body between the thorax and pelvic girdle.
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