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Plant Responses: Part 1

Plant Responses: Part 1. What are plant responses?. All living organisms will respond to a stimulus, including plants A stimulus is anything in the environment that changes an organism’s behavior

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Plant Responses: Part 1

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  1. Plant Responses: Part 1

  2. What are plant responses? • All living organisms will respond to a stimulus, including plants • A stimulus is anything in the environment that changes an organism’s behavior • Example: If you are sitting in a dark room watching a movie and you hear the telephone ring, you may jump. You have just responded to the stimulus by changing your behavior! • Examples of plant stimuli: light, temperature, amount of water, gravity

  3. Tropisms Tropisms are responses of a plant to an outside stimulus • Outside of an organism We will learn about 3 types: • Thigmotropism • Phototropism • Gravitropism

  4. Thigmotropism • Thigma means touch in Greek • If something touches certain plants, this changes the plant’s behavior • E.g. in a pea plant, if something touches one of its stems/leaves, it will wrap itself around something

  5. Phototropism • When a plant responds to light: a plant will bend towards the light • If a plant is growing towards light, it is called positive phototropism • If it is growing away from the light, it is called negative phototropism

  6. Gravitropism • Response of a plant to gravity • Plants with roots growing downwards is called positivegravitropism • If plants have a stem growing upwards, it is called negativegravitropism • Click to see animation

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