2386832
Description
Mind Map by hereislily, updated more than 1 year ago
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Created by hereislily
over 9 years ago
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Tropisms
- What are tropisms?
- A tropism is growth in response to a stimulus
- A tropism is growth in response to a stimulus
- What are negative and positive tropisms?
- Positive tropism: A positive tropism is
growth towards the stumulis
- Negtive tropism: A negative tropism is growth
away from the stimulus
- Positive tropism: A positive tropism is
growth towards the stumulis
- There are three different types of tropisms
- Geotopisms: Growth in respons to gravity
- Phototropism: Growth in response to light
- Hydrotropism: Growth in response to water
- Geotopisms: Growth in respons to gravity
- What are auxins?
- Auxins are a group of hormones that are found in plants
- They are normally found in the tips of shoots and roots or
have diffused therefor being found in over parts of the plant
- They change the elongation in plant cells controlling the direction of growth
- Auxins are a group of hormones that are found in plants
- How do auxins make tropisms?
- Plants will grow in a certain direction according to the
position of the light in order for photosythesis to take
place
- Plants have developed a stimulus known as
tropisms in order to make sure they grow
towards sources of light and water
- Plants will grow in a certain direction according to the
position of the light in order for photosythesis to take
place
- How are plant hormones used in agriculture?
- They are used as weedkillers that are not
harmful to surrounding plants or animals
- To produce new plants from cuttings as farmers are
able to use 'Hormone Rooting Powder' so cut stems can
develop roots and grow into clones of their parent plant
- Hormones can also be used to ripen fruit or induce flowering
when needed and speed up or slow down the growth
- Some unpollinated plants are treated so they grow
fruit without seeds
- They are used as weedkillers that are not
harmful to surrounding plants or animals
- Experiments to show the effect of tropisms
- Cress experiment expected outcome: The cress responded to the stimulus reasonable well as
the shoots moved towards the light gradually when it was on the left. More auxin was
produced on the side with less light shining on and so the plant grew more on that side and
bent towards the light. The roots also responded quite well to the gravity and geotropism.
- Cress experiment expected outcome: The cress responded to the stimulus reasonable well as
the shoots moved towards the light gradually when it was on the left. More auxin was
produced on the side with less light shining on and so the plant grew more on that side and
bent towards the light. The roots also responded quite well to the gravity and geotropism.
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