What is Coral Reef ?
Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.

How It Is made ?
Ployp are tiny animal they thrive ,grow and then die and leave there limestone skeletons behind which layer by layer form reef
Zooxanthallae is microscopic algae
Coral Reef = Coral Polyp + Zooxanthallae
Symbiotic Relationship between Coral Polyp and zooxanthallae
Zooxanthallae assist coral in nutrient production through its photosynthesis activities which provide coral fixed carbon compound for energy and enhance calcification
Host Coral polyp provide its zooxanthallae with protected environment to live within and steady supply of carbon dioxide for its photosynthesis process

Coral Bleaching
Bleaching or paling of coral color occurs when
Temperature- Warmer water temperatures can result in coral bleaching. When water is too warm, corals will expel the algae (zooxanthellae) living in their tissues causing the coral to turn completely white
Sudden exposure of coral reef to atmosphere during low tide
Fresh water dilution-storm generated precipitation and runoff can carry pollutants which cause coral bleaching
Eutrophication

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What is coral reef and coral bleaching || Quikr Exam

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