J lives immediately above O and O lives on an odd numbered floor. There are 2 floors between J and N. And N does not live on lowermost floor. (so, we get following possible cases here). Case-1 
There are 2 floors between O and one who likes Orange and it is also given that person who likes Orange, does not live on the top most floor. There is only 1 floor between O and yellow. Person who like Yellow does not live on lowermost floor. 
K lives on an even numbered floor and immediately above L. And it is also given that L does not like Yellow. 
Only 1 floor is between L and Black. One who likes Brown lives on an even numbered floor immediately above the one who likes Green and Q lives immediately below the one who likes Green. It is also given that L does not like Green. (so, case 2(a) and case 4 gets eliminated here). 
Only 2 floors are between Blue and White. (so, case 2(b) and case 3 gets eliminated here). One who likes blue lives on an even numbered floor. 
M does not live on an odd numbered floor. After filling the remaining data, we get: 
Major source of water used by plants is:
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Statem...
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Genetic disassortative mating will result in:
