Starter quiz
- Calculate the mean of these numbers: 40, 50 and 39.
- '43' ✓
- How many millimetres are there in a centimetre?
- '10' ✓
- Which of these are plant hormones?
- nectar
- gibberellins ✓
- oestrogen
- auxins ✓
- pollen
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- What effect does auxin have on shoots?
- It inhibits growth.
- It stimulates growth. ✓
- It has no impact on growth.
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- What is a tropism?
- A plant growth response to gravity.
- A plant growth response to light.
- A plant growth response to water.
- A plant growth response to a stimulus. ✓
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Which images correctly show phototropism?- a ✓
- b
- c ✓
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Exit quiz
What is the height of this seedling in mm?- '55' ✓
What should you not do on a biological drawing?- stippling
- shading ✓
- labelling
- sketching ✓
- continuous lines
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After 5 days, which seedlings had increased the most in height?- the seedlings grown in the darkness ✓
- the seedlings grown in the partial sunlight
- the seedlings grown in the full sunlight
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- Which of the following conclusions can be made from this graph?
- The seedlings grown in full sunlight were the healthiest.
- It is best to grow seedlings in the dark.
- The seedlings grown in partial sunlight have smaller leaves.
- The seedlings grown in the dark increased the most in height. ✓
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- What is the plant response to light known as?
- 'Phototropism' ✓
Look at this picture of a shoot. From which direction is the light coming and in which side of the shoot has auxin gathered?- the light is coming from the left; auxin has gathered in the left of the shoot
- the light is coming from the left; auxin has gathered in the right of the shoot
- the light is coming from the right; auxin has gathered in the left of the shoot ✓
- the light is coming from the right; auxin has gathered in the right of the shoot
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Investigating the response of newly germinated seedlings to bright directional light (e.g. mustard seedlings)
- Accurately measuring the length of growth
- Producing accurate, labelled scientific drawings to depict the growth response
- Interpreting and describing the results
- Explaining the growth response of seedlings to light using ideas about auxins and phototropism
Common misconception
Pupils may think auxins move down the side of the stem that is nearest to the light and cause it to bend. Pupils may also think that sketched drawings are more accurate than scientific line drawings.
Auxins move down the shaded side causing cell elongation, which causes the seedling to grow towards the light. Line diagrams are representations that are clear and labelled; making them easy to read.
Keywords
Quantitative data - Data that is collected through taking measurements.
Qualitative data - Data that is collected through making observations.
Auxins - Plant hormones that affect the growth of plants.
Phototropism - Growth response stimulated by light.
Conclusion - A summary of the results of an investigation with data and scientific explanations
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