1.    
B1.2.3 Control in plants
GCSE items that can be used to define successful outcomes for peer and self assessment activities

2. Using Exam pro items to support successful outcomes
Assessment of practical work
Using Exam pro items to support successful outcomes
Students will be able to test their progress against learning outcomes using questions taken from past AQA GCSE examinations.
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3. Diagram 3 shows the potted plant after two days in the dark.
A student grew a plant in an upright pot.
She then put the pot in a horizontal position and left the plant in the dark for two days.
Diagram 3 shows the potted plant after two days in the dark.
Plant growing upright Plant put horizontal Plant after 2 days
in the dark in the dark
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4. Explain fully why the plant responded in this way.
(4 marks)
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5. Gravity accept gravitropism / geotropism 1
caused redistribution of auxin / hormone to lower side of stem 1
these hormones stimulate growth of cells on the lower side of the stem only
so the stem grows upwards
[4]
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6. B1.2.3 Control in plants June 2012 BL1HP
Charles Darwin investigated tropisms in plants.
Some students did an investigation similar to Darwin’s investigation.
The students:
grew seeds until short shoots had grown
used black plastic to cover parts of some of the shoots
put the shoots in light coming from one direction
put boxes over the shoots to keep out other light.
The diagrams show how the investigation was set up.
Two days later the students took off the black plastic covers and looked at the shoots.
The diagrams show the results.
BL1HPJune2012
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7. (b) Shoot A bent towards the light as it grew. Explain how.
B1.2.3 Control in plants June BL1HP
Give two variables that the students should control in this investigation.
(2 marks)
(b) Shoot A bent towards the light as it grew.
Explain how.
(4 marks)
(c) What conclusions can be drawn from the results about:
(c) (i) the detection of the light stimulus
(1 mark)
(c) (ii) where in the shoot the response to the light takes place.
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8. (c) What conclusions can be drawn from the results about:
(c) (i) the detection of the light stimulus
(1 mark)
(c) (ii) where in the shoot the response to the light takes place.
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9. B1.2.3 Control in plants June 2012 Mark scheme
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