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Solution


Q.

Assertion: The effect of root pressure in transport of water is more important at night.
Reason: During day, stomata is open, transpiration takes place which helps in transport of water.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct but reason is not the correct explanation of assertion.  
3 Assertion is true but Reason is false.  
4 Assertion is false but Reason is true  

Ans.

(1)

During the day transpiration becomes the main driving force for pulling up water. But at night since there is no sunlight transpiration does not take place, so water is pulled up due to root pressure. Thus, both assertion and reason are correct and reason is the correct explanation of the assertion.