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Zooxanthellae have a parasitic relationship with corals.

Question

Zooxanthellae have a parasitic relationship with corals.

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Solution

Actually, Zooxanthellae do not have a parasitic relationship with corals. Instead, they have a symbiotic relationship, specifically a type of mutualism. Here's how it works:

  1. Zooxanthellae are microscopic algae that live within the tissues of corals. They are photosynthetic organisms, which means they can convert sunlight into energy.

  2. The corals provide the zooxanthellae with a protected environment and the compounds necessary for photosynthesis.

  3. In return, the zooxanthellae produce oxygen and help the coral to remove wastes. Most importantly, they supply the coral with organic products of photosynthesis, which the coral uses for energy.

  4. This energy is used by the coral for growth, reproduction, and to build its hard skeleton.

  5. This mutualistic relationship is crucial for the survival of coral reefs. When corals are stressed by changes in conditions such as temperature, light, or nutrients, they expel the symbiotic zooxanthellae. This leads to a lighter or completely white appearance, hence the term 'coral bleaching'.

So, rather than being parasitic (where one organism benefits at the expense of the other), the relationship between zooxanthellae and corals is mutually beneficial.

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