How do organisms react to their environment?

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Presentation transcript:

How do organisms react to their environment? Stimulus - Response How do organisms react to their environment?

What is a Stimulus? A change in an organism’s surroundings that causes the organism to react. For example: A light shining in your eye A cat running in front of a dog An approaching predator Thirst wind

There are two types of stimuli INTERNAL STIMULUS: Stimulus that comes from inside the organism Examples: Hunger, thirst, fever EXTERNAL STIMULUS: Stimulus that comes from outside the organism Examples: light, sound, temperature of environment

What is a Response? An action or change in behavior caused by a stimulus Examples: Running away, chasing a cat, drinking water, sweating, pupils dilating

Specific Responses in Plants Phototropism- plants growing towards sunlight Geotropism- plants’ response to gravity. Roots always grow down, and shoots always grow up.

Specific responses in cells Turgor Pressure: plant’s ability to hold enough water in the plant, which allows a plant to stay upright. What stores water in plant cells?