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[A] : Pearl is formed when a foreign par...

[A] : Pearl is formed when a foreign particle gets in between shell and mantle .
[R] : The inner nacreous layer called mother of pearl is formed by layers of `CaCO_(3)` and concholin.

A

1)If both A and R are true and R is the correct explanation of A

B

2)If both A and R are true but R is not the correct explanation of A

C

3)If A is true and R is false

D

4)If both A and R are false

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  1. [A] : Annelids , Arthropods and mollusks are protostomial coelomates ....

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  2. [A] : The body cavity of earthworm is a true coelem . [R] : It is li...

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  3. [A] : Pearl is formed when a foreign particle gets in between shell an...

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  4. [A] : Fasciola is hermaphrodite . [R] : Gonads are well developed an...

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  5. [A] : There are 10 tidemanns bodies in ambulacral system of echinoderm...

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  6. [A] : Termites and ants are social insects . [R] : They make fungus ...

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  7. Assertion(A): In sponges, archaeocytes are totipotent. Reason( R): T...

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  8. [A] : The honey is a vital food for animals including man . [R] : Th...

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  9. [A] : Leeches secrete Hirudin from their salivary glands . [R] : Hir...

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  10. [A] : All invertebrates can keep their body temperature constant all t...

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  11. [A] : In Taenia solium , bladder worm is also known as cysticercus . ...

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  12. [A] : Earthworm obtain oxygen for respiration through moist skin . The...

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  13. [A] : Presence of alimentary canal would not have suited the mode of l...

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  14. [A]: Development in cockroach is termed as retrogressive metamorphosis...

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  15. [A] : All the gills of Palaemon are phyllobranchs . [R] : Each gill ...

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  16. [A] : Renal-sac of Prawn functions in same manner as vertebrate kidney...

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  17. [A] : Pila is adopted to lead an amphibious life . [R] : It is provi...

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  18. [A] : Chordates have poor regeneration power while non-chordates have ...

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  19. [A] : In lower invertebrates the digestion is intracellular while in h...

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  20. [A] : Chordates have an oxygen carrying pigment called haemoglobin . I...

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