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Practical Guide
Biology
Plant Responses
This document contains:
Links to YouTube clips showing the practical procedure
Information from examination boards AQA, OCR, Edexcel
Potential examination questions and answers
This resource is strictly for the use of member schools for as long as they remain members of The PiXL Club. It may not be copied, sold nor transferred to a third party or used by the school after membership ceases. Until such time it may be freely used within the member school.
All opinions and contributions are those of the authors. The contents of this resource are not connected with nor endorsed by any other company, organisation or institution.
Commissioned by The PiXL Club Ltd. November 2016
The PiXL Club Ltd, Company number
© Copyright The PiXL Club Ltd, 2016

2. Required practical – exam boards
AQA
Edexcel
OCR

3. Practical procedure: Plant responses
Video 1
Video 2
Click on each of the tabs to take you to a YouTube clip. Please note these are external sites to PiXL, PiXL does not control the content of these sites.
Image from:

4. Possible examination style questions
Look at the following diagram and describe the results you would expect to see.
Name the hormone which causes this tropism.
Explain how these hormones cause phototropism to occur.
Evaluate your practical. How would you improve the AQA procedure?
Explain how roots respond to gravity.
What would happen if you planted a seed upside down? Use an image to help you to explain.
LIGHT

5. Possible examination style questions answers
Look at the following diagram and describe the results you would expect to see.
LIGHT
ANS:
No tip – growth straight up only
Opaque cap – growth straight up only
Clear cap – growth towards the light
Control – growth towards the light

6. Possible examination style questions answers
Name the hormone which causes this tropism.
ANS:
Auxin

7. Possible examination style questions answers
Explain how these hormones cause phototropism to occur.
ANS:
Auxin made in shoot tip
Diffuses to the shaded side of tip
Auxin causes cells to elongate
Cells elongate more on the shaded side
Shoot grows towards the light

8. Possible examination style questions answers
Evaluate your practical. How would you improve the AQA procedure?
ANS:
Change the light intensity to create a larger range for the independent variable – could have a light source at different distances
Measure the angle of the stem
Place all plants in boxes to increase the control of the light

9. Possible examination style questions answers
Explain how roots respond to gravity.
ANS:
Geotropism or gravitropism
Roots are positively gravitropic/ geotropic
Auxin produced at tip of root
Auxin becomes unevenly distributed – more on the bottom surface
Roots grow downwards due to uneven distribution of auxin

10. Possible examination style questions answers
What would happen if you planted a seed upside down? Use an image to help you to explain.
ANS:
Root would grow downwards
Shoot would grow upwards
Auxin
Diagram showing root growing down and shoot up

11. Key questions: Why was the third petri dish placed in the dark?
Why did you measure the height of the seedlings for at least a week?
Why did you use equal quantities of water and seeds?
What could be used instead of the cotton wool as a growth medium?
State the control variables for this practical.
How could the procedure be adapted to generate data which could be plotted as a line graph?
Explain the results of the practical.
What safety precautions are used in the practical?

12. Summary document
A summary document is also available on Huddle which contains all the relevant information about this practical from the different examination boards. This document includes practical methods and other potential examination questions