Which of the following are the necessary conditions for the growth of coral reefs ? 1. Photic conditions 2. Clean and sediment free water 3. Sea salinity of 6% 4. Tropical sea water with temperature of 20DC to 21C Select the correct answer using the code

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Q: 93 (CAPF/2017)

Which of the following are the necessary conditions for the growth of coral reefs ?
1. Photic conditions
2. Clean and sediment free water
3. Sea salinity of 6%
4. Tropical sea water with temperature of 20DC to 21°C
Select the correct answer using the code given below :

question_subject: 

Geography

question_exam: 

CAPF

stats: 

0,31,43,31,6,15,22

keywords: 

{'coral reefs': [2, 0, 0, 6], 'tropical sea water': [0, 0, 0, 1], 'sea salinity': [0, 0, 0, 2], 'necessary conditions': [0, 0, 0, 1], 'photic conditions': [0, 0, 0, 1], 'growth': [1, 1, 1, 0], 'sediment free water': [0, 0, 0, 1], 'temperature': [0, 1, 1, 7]}

The necessary conditions for the growth of coral reefs are outlined in the options provided.

Option 1 includes three conditions: 1) photic conditions, which means that the reefs need to be in shallow water where sunlight can penetrate to allow photosynthesis by algae living in the coral; 2) clean and sediment-free water, as excessive sedimentation can smother the coral and hinder their growth; 4) tropical sea water with a temperature of 20 to 21°C, as coral reefs thrive in warm waters.

Option 2 includes only two of the necessary conditions for coral reef growth: clean and sediment-free water, and tropical sea water with a temperature of 20 to 21°C. This option is incorrect as it misses out on the importance of photic conditions.

Option 3 includes two conditions: photic conditions and sea salinity of 6%. This option is incorrect as the sea salinity requirement is not a necessary condition for coral reef growth.

Option 4 includes all four necessary conditions for coral reef growth: photic conditions, clean and sediment-free water, sea salinity of 6%, and tropical sea water with a temperature of 20 to 21°C. However, the correct answer is 1, indicating that only options 1,