| A | B |
|---|
| Tropism | The directional response plants make to a stimulus |
| Geotropism | Response to gravity |
| Phototropism | Response to light |
| Negative | Response away from a stimulus |
| Positive | Response towards a stimulus |
| Water and minerals | Found by plant roots when they grow down |
| Light | Found by plant shoots when they grow up, out of the soil |
| Undergound | Where developing seedlings are when they can't use light as a stimulus |
| Shaded side | Where plants produce most auxin |
| Grow faster | What auxin makes cells on the shaded side do |
| Bend | What the shoot does if cells on one side grow faster than those on the other |
| Shoot tip | Where auxins are produced in a plant |
| Diffuse | How auxins move from the tip to the shaded side of a shoot |
| Photosynthesis | Why do plant shoots need to grow towards the light |
| Rooting powder | What promotes plant cuttings to grow roots |
| Pollination | What hasn't happened in plants tricked by sprayed hormones into producing seedless fruits |
| Big leaves | The reason weeds take in so much hormone that they grow too fast and die |
| Weedkiller | You spray it on lawns and its full of plant growth hormones |
| Grass | A plant with small leaves that doesn't take up much hormone when you spray your lawn |
| Growth and development | Regulated by plant growth substances |
