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) Name the growth response shown by B. (d) Suggest a benefit to the plant of the growth response shown by B. (e) Give an example of a regulator in plants that inhibits growth. (f) Give two uses of plant growth regulators in horticulture.

Leaving Cert Biology Plant Responses & Seed Growth: The diagram shows a young plant

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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Answer

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.

The diagram shows a young plant growing in a tilted seed box - Leaving Cert Biology - Question 2 - 2009

Worked Solution & Example Answer:The diagram shows a young plant growing in a tilted seed box - Leaving Cert Biology - Question 2 - 2009

From which structure in the seed did A develop?

Name the growth response shown by A.

Name the growth response shown by B.

Suggest a benefit to the plant of the growth response shown by B.

Give an example of a regulator in plants that inhibits growth.

Give two uses of plant growth regulators in horticulture.

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