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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

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

B

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

C

If A is true and R is false

D

If both A and R are false

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TRUEMAN BIOLOGY-Animal Kingdom -ASSERTION AND REASON
  1. [A] : In the adult bird , only the left ovary is well developed . [R...

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  2. [A] : Rabbit is classified as mammal . [R] : Rabbit possesses mammar...

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  3. [A] : Origin of mammals is polyphyletic . [R] : Mammals are derived...

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  4. [A] : The Ascidian tadpole larva possess all the basic chordate charac...

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  5. [A] : Tail wagging dance is performed for short distances . It conveys...

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  6. [A] : A pair of coxal glands are found in each side of metasoma of sco...

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  7. [A] : Honey bees are social insects known for producing honey and bees...

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  8. Assertion : Cold blooded animals do not have fat layer. Reason : Col...

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  9. [A] : Neoteny is the retention of larval form throughout the life . ...

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  10. [A] : In Parthenogenesis , fertilized egg is stimulated to divide . ...

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  11. [A] : Protozoans have no physiological division of labour . [R] : Th...

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  12. [A] : Visceral leishmaniasis is caused by the sand flies . [R] : Whe...

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  13. [A] : Many desert mammals cool the exhaled air in their noses , befor...

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  14. [A] : Amoeba is regarded as the lowest form of animals. [R] : Body o...

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

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  16. Assertion : Bats and whales are classified as mammals Reason : Bats ...

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  17. [A] : The coelomic cavity of Leech is mostly filled with botryoidal ti...

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  19. [A] : Tail wagging dance is performed for short distances . It conveys...

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  20. Assertion: The duck-billed platypus and the spiny anteater, both are e...

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