Give reasons:

(i) Freshwater fish cannot survive in sea water.

(ii) Plants growing in well fertilized soils wilt if the soil is not watered.

1) Freshwater fish cannot survive in sea water as it is not tolerant to high salt conditions of sea water. Salty water causes fish to loose water from their cells quickly through osmosis  with no way of replacing it as present in sea water fishes.
2) Plants growing in well fertilised soil will definitely wilt if water is not supplied to them properly. Nutrients available in fertilizers will only reach to plants by getting dissolved in water.