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AGENDA

  • What is symbiosis?
  • What are the different kinds of symbiosis?
  • Examples
  • What is Homeostasis?
  • What are some examples of how organisms maintain homeostasis?

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What is symbiosis?

What it means:

  • Two organisms that live together
  • Temporarily or for a longer time
  • At least one of the organisms � benefits from the relationship

Literal definition: �the act of living together

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What are the different kinds of symbiosis?

Parasitism

Mutualism

Commensalism

both organisms benefit

one organism benefits

one organism benefits

one organism is unaffected

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one organism is harmed

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Parasitism: one benefits, one is harmed

Example 1: �Acacia plant with ant galls

Ants lay eggs on acacia tree�Acacia covers the infected area with brown flesh (gall)

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Mutualism: both benefit

Example 2: �Moray Eel with Cleaner Fish

Moray Eel gets a clean mouth Cleaner Fish gets a meal

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Commensalism: one benefits, one is unaffected

Example 3: �Cattle with cattle egrets

Cattle stir up insects as they eat grass�Egrets hang around and eat insects

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Commensalism: one benefits, one is unaffected

Example 4: �Clown fish with anemone

Clown fish gets protection Anemone is unaffected

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Mutualism: both benefit

Example 5: �Antelope with Oxbird

Antelope gets rid of parasites Oxbird gets a meal

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Parasitism: one benefits, one is harmed

Example 6: �Taenia worm in human eye

Worm infects human blood stream�Human may go blind

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Homeostasis

  • Maintaining a stable internal environment.

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Examples of Homeostasis

  • The thickening of fur in winter
  • The darkening of skin in sunlight
  • The seeking of shade in heat,
  • The production of more red blood cells at high altitude.
  • A dog panting to release body heat.

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More examples

  • The regulation of the amounts of water and minerals in the body. This is known as osmoregulation. This happens in the kidneys.
  • Cold-blooded animals lying in the sun to warm up.
  • The removal of metabolic waste. This is known as excretion. This is done by the excretory organs such as the kidneys and lungs.

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Even More Examples

  • The regulation of body temperature. This is mainly done by the skin.
  • The regulation of blood glucose level. This is mainly done by the liver and the insulin secreted by the pancreas.

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