9. (a) (i) Name a growth response of a plant to a stimulus - Leaving Cert Biology - Question 9 - 2020
Question 9
9.
(a) (i) Name a growth response of a plant to a stimulus.
(ii) Give one example where this growth response is important to a germinating seed.
(b) A student car... show full transcript
Worked Solution & Example Answer:9. (a) (i) Name a growth response of a plant to a stimulus - Leaving Cert Biology - Question 9 - 2020
Step 1
Name a growth response of a plant to a stimulus.
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Answer
Phototropism, which is the growth of a plant towards light, is a well-known growth response to a stimulus.
Step 2
Give one example where this growth response is important to a germinating seed.
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Answer
Phototropism is important for a germinating seed as it ensures that the shoot grows upwards towards the light, promoting photosynthesis.
Step 3
Identify which dish was the control.
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Answer
Dish B, which contains 5 seeds + water, serves as the control.
Step 4
Suggest a type of seed suitable for this investigation.
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Answer
Radish seeds are a suitable type of seed for this investigation, as they germinate quickly and are easy to observe.
Step 5
Describe how the IAA solution was applied to the plant tissue.
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Answer
The IAA solution was likely applied using a dropper to pour or bathe the seeds in the solution, ensuring that they absorb it effectively.
Step 6
Describe how the growth of the plant tissue was measured.
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Answer
The growth of the plant tissue was measured using a ruler or measuring tape to obtain accurate lengths of the stems and roots.
Step 7
Why was the same number of seeds used in each dish?
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Answer
The same number of seeds was used in each dish to allow for fair comparison and to minimize variables that could affect the results.
Step 8
Which part of the plant was stimulated by IAA?
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Answer
The stem of the plant was stimulated by IAA, promoting upward growth.
Step 9
Which part of the plant was inhibited by IAA?
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Answer
The root of the plant was inhibited by IAA, showing decreased growth.
Step 10
Name another plant growth regulator.
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Answer
Abscisic acid is another plant growth regulator that plays various roles in plant responses.
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