9 (a) Phototropism or geotropism or other valid named tropism
Must link with above answer (e.g - Leaving Cert Biology - Question 9 - 2014
Question 9
9 (a) Phototropism or geotropism or other valid named tropism
Must link with above answer (e.g. phototropism-stem growing upwards/root growing downwards).
(b) (i) D... show full transcript
Worked Solution & Example Answer:9 (a) Phototropism or geotropism or other valid named tropism
Must link with above answer (e.g - Leaving Cert Biology - Question 9 - 2014
Step 1
Phototropism or geotropism or other valid named tropism
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Answer
Phototropism refers to the growth response of a plant toward light, resulting in stems growing upwards as they seek light. Conversely, geotropism describes the growth response of plant roots downwards in response to gravity.
Step 2
Dish B
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Answer
Use Dish B to conduct the experiment.
Step 3
Radish or other named valid seed type
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Answer
Radish seeds are suitable for the experiment due to their quick germination and growth characteristics.
Step 4
Dropper/ to pour on/bathe in
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Answer
Use a dropper to pour or bathe the seeds in water or a growth solution to ensure adequate moisture for germination.
Step 5
Ruler/measuring tape
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Answer
Employ a ruler or measuring tape to accurately measure the growth of the plants over time.
Step 6
Allow for failure or average/to allow fair experiment
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It's essential to allow for potential errors in the experiment; therefore, plan for multiple trials or record average growth to ensure reliability.
Step 7
Stem was stimulated
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Answer
In this experiment, the stem of the plant will be stimulated to grow towards the light source, demonstrating phototropism.
Step 8
Root was inhibited
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The roots will be inhibited from growing towards the light source, as they respond positively to gravity (geotropism) and grow downwards.
Step 9
Abscisic acid or other valid growth regulator
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Answer
Abscisic acid is a growth regulator that can inhibit growth under stress conditions and can be used to study its effects on plant responsiveness.
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