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Plant responses

Plant responses. May 6, 2014. How are plants like other organisms?. They respond to stimuli That is they react to their environment How? Tropisms --automatic, movement of a plant in response to particular stimuli Can react by growing toward (positive) or away (negative).

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Plant responses

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  1. Plant responses May 6, 2014

  2. How are plants like other organisms? • They respond to stimuli • That is they react to their environment • How? • Tropisms --automatic, movement of a plant in response to particular stimuli • Can react by growing toward (positive) or away (negative)

  3. How do plant actually grow in response to stimuli? • Plants release growth hormones that actually trigger certain plant cells to elongate causing the plant to actually bend • Ex. Auxins – cause plant cells to elongate • Are their others? • Yes, some trigger ripening, others cause color changes

  4. What are the different tropisms? • 1.Phototropism – growth of plants either toward or way from light • Negative type would be the growth of roots

  5. 2. Geotropism – growth in reaction to gravity • Causes plant roots to grow downward and shoots to grow upward • Which is positive and which is negative?

  6. 3. Thigmotropism – growth of objects in reaction to hard surfaces • Ex. Ivy growing up a wall

  7. Are there more? • Yes, • Hydrotropism, growth in relation to water • Skototropism, growth in relation to darkness

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