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[A] : in amphibians heart is two chamber...

[A] : in amphibians heart is two chambered.
[R]: The oxygenated blood is returned to the heart through sinus venosus.

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

Text Solution

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The correct Answer is:
D
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TRUEMAN BIOLOGY-Animal Physiology -ASSERTION AND REASON
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  2. [A] : The record of electric potential that is ini- tiated in the card...

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  3. [A] : in amphibians heart is two chambered. [R]: The oxygenated blo...

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  4. [A] : Peyer s patches are derivatives of lymphoid tissue. [R]: The...

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  5. [A] : Elephants have lophodont type of teeth. [R]: There is an int...

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  6. [A] : A complete double circulation occurs in birds for the first time...

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  7. [A] : The heart of birds is more advanced than the four chambered hear...

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  8. A : Portal system consists of veins which start from capillaries and e...

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  9. [A]: in mammalian heart there is a very swift conduction of stimulatio...

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  10. [A] : Reduced blood can carry more CO2 than oxygenated blood. [R]:...

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  11. [A] : The central nervous system regulates the release of saliva from ...

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  12. [A] : Gall stones are pebble sized structures that formed in the gall...

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  13. [A] : Upon stimulation of a muscle cell, cal- cium ions (Ca^(++)) are...

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  14. [A]: Osteoporosis is a bone disorder that results from the loss of cal...

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  15. [A] : In mammals, ends of presynaptic fibres are enlarged to form syn...

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  16. [A] : Receptors located in tendons, joints and skeletal muscle give in...

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  17. [A]: Lateral-iine organs are important in con- nection with aquatic mo...

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  18. [A] : Accommodation in the bird's eye is controlled by the ciliary app...

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  19. [A] : Mammals lack mucous glands in their skin. [R] : The epidermis ...

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  20. [A] : In old age, the skin gets wrinkled. [R]: Epidermis has a sin...

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