The diagram shows a vertical section through a carpel - Leaving Cert Biology - Question a - 2004
Question a
The diagram shows a vertical section through a carpel.
(i) Name A, B, C, D, E.
(ii) What happens to the two nuclei labelled D?
(iii) In the case of B and E state ... show full transcript
Worked Solution & Example Answer:The diagram shows a vertical section through a carpel - Leaving Cert Biology - Question a - 2004
Step 1
Name A, B, C, D, E.
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Answer
A = stigma or style
B = ovary
C = embryo sac (also allow for nucellus)
D = polar nuclei
E = ovule (also allow for integuments)
Step 2
What happens to the two nuclei labelled D?
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Answer
The two polar nuclei (D) fuse together to form a diploid nucleus, which may then develop into a triploid nucleus as part of the formation of the endosperm during fertilization.
Step 3
In the case of B and E state what may happen to each of them after fertilisation.
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Answer
B becomes the fruit after fertilization, which provides protection and nourishment for the developing seeds.
E becomes the seed or testa, which is the protective outer layer surrounding the seed, supporting its development.
Step 4
Copy the diagram into your answer book and add a pollen tube that has completed its growth. Label the nuclei in the pollen tube.
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Answer
Include a diagram of the carpel with the pollen tube extending from the stigma towards the ovule. Label the nuclei in the pollen tube as generative nucleus and vegetative nucleus.
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