Coral reefs are diverse underwater ecosystems that are formed by colonies of tiny coral animals called polyps. These ecosystems are typically found in warm, shallow, clear waters with plenty of sunlight.

Option 1: Lakshadweep Islands - This is a group of islands located off the southwestern coast of India. Being in warm waters of the Arabian Sea, it is possible to find coral reefs around these islands, making this option incorrect.

Option 2: Gulf of Kachchh - This is a bay located in the northwestern part of India. It is known for its rich marine biodiversity and is home to coral reefs. Therefore, this option is not the correct answer.

Option 3: Gulf of Mannar - This is a shallow bay located between India and Sri Lanka. Coral reefs are known to thrive in this region due to its warm waters and suitable environmental conditions. Hence, this option is not the correct answer.

Option 4: Gulf of Cambay - This is a bay located in the western part of India. It is not known for having coral reefs. Therefore, this option is the correct answer as coral reefs are not found in this region.

In conclusion, coral reefs can be found in Lakshadweep Islands, Gulf of Kachchh,