Required Practical 8: Define: Phototropism: Geotropism: Bullet point how you would investigate the effect of light on the growth of seedlings using the following apparatus: 6 4 The role of auxin: Draw labelled biological drawings of what you would expect to see from your experiment: 5 Required Practical 8: The effect of light or gravity on newly germinated seedlings 7 Controlling variables: These bean shoots were grown in the dark. Explain the results: Variable How you could control it Number of seeds Type of seed Temperature Water Light Intensity 6 8