A. Calcium
B. Silica
C. Chitin
D. Both A
Related Mcqs:
- Strengthening material of prokaryotic cell wall is__________??
- Arthrodial membranes are made of:
- The principal ingredients of moulding sands are
- All of the following coelenterates show alternation of generation except:?
- Enteron in coelenterates acts as___________??
- The facting sand used in foundry generally consists of
- Snails belong to__________??
- Plasmodium belongs to__________??
- In all arthropods,the body is covered with a chittinous cuticle which is secreted by the____________??
- The first tropic level refers to__________?
