• # question_answer                                                                                    Consider the following factors. 1. Temperature between ${{18}^{o}}C$ and ${{20}^{o}}C$ 2. Upwelling of cold water 3. Salinity above ${{40}^{o}}$ %o 4. Turbidity 5. Fresh water 6. Submarine Plate forms Which of the above factors are not suitable for the growth of corals? A)  1, 2, 3 and 4                B)  3, 4, 5 and 6C)  2, 3, 4 and 5  D)  1,3, 5 and 6

Corals grow well in areas where temperature varies between ${{18}^{o}}C$ and ${{30}^{o}}C$. Upwelling of cold water in the tropical oceans leads to lowering of temperature below ${{18}^{o}}C$ which is harmful for the corals. Salinity between 27% and 30% is suitable for corals and salinity below 27% and higher than 30% is harmful for the corals. Turbidity indicates the presents of suspended material which is harmful for the corals. Like sediment associated with turbidity, fresh water is also harmful for the corals,