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Due to paucity of time it would not be possible for us to provide the answers to all your queries. We are providing solutions to some of your queries. Try solving rest of the questions yourself and if you face any difficulty then do get back to us. 

79) The correct answer is option (1).
The glucose is co-transported with sodium ions into PCT by SGLT2 cotransporter. It is a type of active transport process.

80) The correct answer is option (3).
Absorption of water occurs in the small intestine by osmosis from the lumen of the small intestine through epithelial cells and into the blood capillaries in the villi. So, tissues absorb water from the blood. 

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