Molluscs have an exoskeleton made up of:
Correct answer: C. CaCO3
- A. Protein
- B. Silica
- C. CaCO3
- D. Cuticles
Explanation
While mollusca exoskeleton does indeed contain proteins as well as calcium carbonate(CaC03) they are composed mostly of calcium carbonate with only a small quantity of protein--no more than 2 percent. These shells, unlike typical animal structures, are not made up of cells (so no cuticle). So option A, B and D are incorrect as it does not contain silica either. Option C is correct.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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