Q.7
Read the statements A, B, C and D carefully
(A) . Essential fish habitats such as coral reefs undergoes threat in the form of ‘bleaching’
(B) . Coral reefs are also improving in it's coverage as in the case of some other essential fish habitats such as mangroves.
(C) . Indian coral reefs are facing serious challenges due to heat stress during El Nino Years.
(D) . Nothern Indian Ocean reefs suffer serious bleaching due to altered 'Walker circulation’ in certain years bringing
additional heat
Choose the correct answer from the options given below:
- Threats to Coral Reef Ecosystems:
- Essential fish habitats like coral reefs face severe threats in the form of coral bleaching: True. Elevated sea surface temperatures cause expulsion of symbiotic dinoflagellates (Symbiodiniaceae).
- Coral reefs are improving in coverage: False. Coral cover is declining globally and along Indian reefs due to thermal anomalies, ocean acidification, and sedimentation.
- Indian coral reefs face severe challenges due to heat stress during El Niño years: True (e.g., massive bleaching events in 1998, 2010, 2016, and 2023 in Gulf of Mannar, Lakshadweep, and Andaman reefs).
- Northern Indian Ocean reefs suffer serious bleaching due to altered Walker circulation bringing thermal anomalies: True.
- Statements (A), (C), and (D) are correct.
- Correct Option: Option 2 ((A), (C) and (D) only).
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