Starter quiz
- True or false? Only animals have hormones.
- True
- False ✓
- What is the process by which plants make their own food?
- 'photosynthesis' ✓
Match the parts of this plant to their description.- a⇔reproductive organ ✓
- b⇔provides support and contains tissues that transport sugars and water ✓
- c⇔where most photosynthesis takes place ✓
- d⇔where minerals and ions are absorbed ✓
What is the name of the tissue in plants where cells grow and elongate?- 'meristem' ✓
- Which of the following is true about hormones?
- They are produced by photosynthesis.
- They are chemicals. ✓
- They are used in reproduction only.
- They are produced by respiration.
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- How do plants grow in height and width?
- photosynthesis
- mitosis ✓
- light
- elongation ✓
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Exit quiz
- What do plant hormones do?
- Control growth and development. ✓
- Prevent mitosis in shoots.
- Deter predators.
- Enable plants to respond to some environmental factors. ✓
-
- ______ are growth responses to stimuli in plants that provide a survival advantage.
- 'tropisms' ✓
- When discussing tropisms, select the correct statements.
- Auxins build up on the shaded side of roots, causing them to bend towards light.
- Shoot cells are stimulated by auxins and so will elongate. ✓
- Auxins build up on the shaded side of shoots, causing them to bend towards light ✓
- Root cells are stimulated by auxins and so will elongate.
-
Which tropism is the plant root below displaying?- positive phototropism
- negative phototropism
- positive gravitropism ✓
- negative gravitropism
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Which direction is light coming from and which side of the shoot is auxin most abundant?- Light coming from the left side and auxin on the left side of the shoot.
- Light coming from the right side and auxin on the right side of the shoot.
- Light coming from the top and auxin on the right side of the shoot.
- Light coming from the left side and auxin on the right side of the shoot.
- Light coming from the right side and auxin on the left side of the shoot. ✓
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- What happens if the tip of a shoot is covered with an opaque material?
- It will grow upwards. ✓
- The plant will stop growing.
- It will grow away from light.
- It will grow towards light.
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Worksheet
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Lesson Details
Key learning points
- Hormones control growth and development in plants, and enable plants to respond to some environmental factors.
- Auxins are plant hormones that control tropisms, which are growth responses in plants that provide a survival advantage.
- Phototropism in a shoot: auxins build up on the shaded side and cause cell elongation, so it bends towards the light.
- Gravitropism in a shoot: auxins build up on the lower side and cause cell elongation, so it bends upwards.
- Gravitropism in a root: auxins build up on the lower side but this stops cell elongation, so it bends downwards.
Common misconception
Pupils may think that plants move towards the sun, rather than grow in that direction. Pupils may also think that plants are not living.
Plants grow in a certain direction through mitosis (in meristem) and elongation. Plants are living as they carry out the common processes of living organisms.
Keywords
Hormone - chemicals released by plants that regulate their growth
Auxins - control the growth of plants by promoting cell division and elongation in plant cells
Tropism - a plant growth response to a stimulus, it can be positive (towards) or negative (away from)
Phototropism - a plant growth response towards or away from light
Gravitropism - a plant growth response towards or opposite the direction of gravity
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