How do living things interact?

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How do living things interact?

• Habitats have an unlimited amount of the
  resources needed by living organisms, such as
  food, water and shelter. All organisms strive to
  reproduce themselves and increase their numbers.
• Sooner or later the demand for these resources is
  going to exceed supply, and organisms have to
  compete with each other to get them.

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PLANTS

• Plants typically compete with each other for
• light (for photosynthesis)
• water
• nutrients (minerals)

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Animals

• Animals typically compete with each other for
• food
• water
• mates (so they can reproduce), and
• living space (shelter)

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Symbiosis

• Some organisms survive and reproduce by living
  closely together with another organism of a
  different species.
• This type of interaction between organisms is
  known as symbiosis.

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Commensalism
Barnacles will attach to a whale or scallop
shell. The barnacles get a home ,access to food
and transportation. The whale or scallop is not
harmed from having the barnacle attach itself to
them. This type of symbiosis, where one organism
benefits and the other suffers no harm, is called
commensalism.
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Mutualism

• Lichens are formed by algae
• and fungi living together.
• Algae can photo-synthesize
• and make food which is
• shared by the fungus.
• The fungus in turn shelters
• the algae from a harsh climate.
• This kind of mutually beneficial
• co-operative interaction is called mutualism.

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Parasitism

• A tapeworm lives inside another animal,
  attaching itself to the host and absorbs food
  from the host's food as it is digested.
• This kind of one-sided symbiosis is called
  parasitism.
• Usually parasites do not kill the host before
  they move on, as this would cut off their food
  supply.

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REVIEW

• Which type of interaction does this picture show?
• A. Parasitism
• B .Comensalism
• C. Symbiosis
• D. Mutualism

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And the answer is
If you chose B Commensalism you are correct!!
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Review

• Parasitism is best described by the following
  examples
• A. Owl and yucca plant
• B. Butterfly and flower
• C. Flea and Dog
• D. Clown fish and Anemone

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And the answer is.

• Pat yourself on the back if you chose answer C,
  Flea and Dog.
• The flea survives by getting its nourishment from
  dog.

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What kind of interaction does this picture show?
REVIEW
A. Mutualism B. Parasitism C. Commensalism D.
Phosphorism
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Answer 4

• Congratulations if you chose Answer A. This
  interaction is an example of Mutualism.
• Although lichens come in a wide variety of forms
  and structures, all lichens are essentially a
  sandwich with a layer of fungi on the outside
  with a filling of an algal species on the inside.

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Resourceshttp//www.bbc.co.uk/schools/sciencec
lips/ages/8_9/habitats.shtml

• Photos http// www .Corbis.com.