Consider the following statements:

1. Most of the world’s coral reefs are in tropical waters.
2. More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and Philippines.
3. Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.

Which of the statements given above is/are correct?

The correct option is 1, 2 and 3.

Let us analyze each statement individually:

Statement 1: Most of the world’s coral reefs are in tropical waters.
This statement is correct. Reef-building corals require shallow, clear, warm waters, typically with temperatures between 20°C and 32°C. Consequently, the vast majority of shallow-water coral reefs are found in tropical regions between the Tropics of Cancer and Capricorn.

Statement 2: More than one-third of the world’s coral reefs are located in the territories of Australia, Indonesia and Philippines.
This statement is correct. The Coral Triangle region (which includes Indonesia and the Philippines) alongside Australia's Great Barrier Reef represents the global epicenter of coral biodiversity. Together, Australia, Indonesia, and the Philippines account for over 33% (more than one-third) of total global coral reef area.

Statement 3: Coral reefs host far more number of animal phyla than those hosted by tropical rainforests.
This statement is correct. While tropical rainforests contain higher overall species diversity (largely due to insects), coral reefs exhibit higher high-level taxonomic diversity. Coral reefs harbor representatives of 32 of the 34 animal phyla, whereas tropical rainforests host significantly fewer animal phyla (around 9 phyla).

Therefore, all three statements 1, 2, and 3 are correct.