The diagram shows a young plant growing in a tilted seed box - Leaving Cert Biology - Question 2 - 2009
Question 2
The diagram shows a young plant growing in a tilted seed box.
(a) From which structure in the seed did A develop?
(b) Name the growth response shown by A.
(c) N... show full transcript
Worked Solution & Example Answer:The diagram shows a young plant growing in a tilted seed box - Leaving Cert Biology - Question 2 - 2009
Step 1
From which structure in the seed did A develop?
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Answer
A developed from the radicle, which is the part of the seed that grows into the root.
Step 2
Name the growth response shown by A.
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Answer
The growth response shown by A is hydrotropism, as it grows towards the water.
Step 3
Name the growth response shown by B.
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Answer
The growth response shown by B is phototropism, as it grows towards the light direction.
Step 4
Suggest a benefit to the plant of the growth response shown by B.
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The benefit of phototropism is that it allows the plant to maximize its exposure to sunlight, which is essential for photosynthesis.
Step 5
Give an example of a regulator in plants that inhibits growth.
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Answer
An example of a regulator in plants that inhibits growth is ethene or abscisic acid.
Step 6
Give two uses of plant growth regulators in horticulture.
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Answer
Rooting powder to stimulate root growth in cuttings.
Selective weedkiller to manage unwanted plant growth.
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