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What is the skeleton of sponges made up ...

What is the skeleton of sponges made up of ?

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Skeleton of sponges is made of spicules or spongin fibres. Spicules are formed of calcium carbonate and silica.
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LAKHMIR SINGH & MANJIT KAUR-DIVERSITY IN LIVING ORGANISMS-Diversity In Living Organisms
  1. Name a fresh water sponge ?

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  2. Name the following : (a) Cavity present in the body of sponges (b)...

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  3. What is the skeleton of sponges made up of ?

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  4. Name the following : (a) Simplest sponges , (b) Commonly known as ...

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  5. Write down two unique characters of Porifera.

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  6. What is the name of gelatinous layer existing between two germ layer o...

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  7. What is the body symmetry of cnidarians or coelenterates ?

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  8. What type of digestion takes place in cnidarians ?

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  9. In which phylum, nervous system develops for the first time ?

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  10. Name the organisms in which asexual reproduction takes place by buddin...

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  11. To which phylum do sponges belong ?

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  12. What is alternation of generation ?

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  13. What is common name of following : (a) Pleurobranchia and (b) Cest...

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  14. Give an example of ctenophora.

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  15. What are colloblasts ?

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  16. What types of body symmetry is present in Platyhelminthes ?

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  17. Name the excretory organs in Platyhelminthes.

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  18. Name the following : (a) Free living Platyheminthes , (b) Scientif...

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  19. Which type of body organisation is present in Platyhelminthes ?

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  20. Give one example of : (a) Platyhelminthes ? (b) Nematoda.

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