Which of the following factors are needed for the growth of corals?
- Freshwater
- Clear shallow salt water
- Plenty of sunlight for photo-synthesis
- Warm water between 23 °C and 25 °C
Select the correct answer using the code given below.
1, 3 and 4 only
2, 3 and 4 only
1 and 2 only
1, 2, 3 and 4
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CAPF – 2021
1. **Freshwater:** Corals are marine organisms and are highly sensitive to salinity changes. Freshwater input (e.g., from rivers) can be detrimental to coral health. Thus, freshwater is NOT needed.
2. **Clear shallow salt water:** Corals need saltwater. Shallow water allows sunlight penetration. Clear water is crucial because suspended sediment can block sunlight (harming zooxanthellae) and smother corals. This factor is essential.
3. **Plenty of sunlight for photo-synthesis:** Most reef-building corals have symbiotic algae (zooxanthellae) living in their tissues. These algae perform photosynthesis and provide the coral with energy. Sufficient sunlight is necessary for this process. This factor is essential.
4. **Warm water between 23 °C and 25 °C:** Corals generally require warm water temperatures, typically between 20°C and 28°C. The range 23-25°C falls well within the optimal temperature zone for many coral species. Sustained temperatures outside this range (too hot or too cold) can cause stress and bleaching. This factor is essential.
Therefore, factors 2, 3, and 4 are needed for the growth of corals.