GIVE REASONS :-
1.WE PANT WHILE CLIMBING STAIRS .
4. PLANTS EXCRETE LESS CARBON DIOXIDE DURING THE DAY TIME. 
5. TINY DROPLETS OF WATER APPEAR IF A PLANT IS COVERED BY PLASTIC.

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Ans1. While climbing stairs, we get tired easily, and start panting. This is because of the downward pull that is being applied on our body by the gravitation pull of earth. An apple falls down from the tree under the influence of gravity. So gravity can be stated as the force with which any body is being attracted towards the earth. If we climb uphill, then we have to do work first to walk and also to overcome the force of gravitation being applied by earth, so we get tired easily. Also there is oxygen deficiency as our body needs more oxygen than it requires normally which leads to panting.

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