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[A] : Plants having capacity to withsta...

[A] : Plants having capacity to withstand wide range of temperature tolerence are said to be eurythermic .
[R] : A plant that grows successfully at moderate temperatures is said to be mesothermic .

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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