Answer the following in relation to sexual reproduction in flowering plants - Leaving Cert Biology - Question a - 2006
Question a
Answer the following in relation to sexual reproduction in flowering plants.
(i) State a role for each of the following: sepal, anther, stigma, ovary.
(ii) Disting... show full transcript
Worked Solution & Example Answer:Answer the following in relation to sexual reproduction in flowering plants - Leaving Cert Biology - Question a - 2006
Step 1
State a role for each of the following: sepal, anther, stigma, ovary.
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Answer
The roles of each structure are as follows:
Sepal: Protects the flower and may assist in attracting insects for pollination.
Anther: Primarily responsible for the production, storage, and release of pollen.
Stigma: Receives the pollen during the process of pollination.
Ovary: Contains ovules or the embryo sac, becomes the fruit after fertilization.
Step 2
Distinguish between pollination and fertilization.
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Answer
Pollination is the transfer of pollen from the male anther to the female stigma. In contrast, fertilization occurs when the pollen grain fuses with the ovule, leading to the formation of a zygote.
Step 3
Do these gametes form as a result of mitosis or meiosis? Explain your answer.
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Answer
The two male gametes form as a result of mitosis from the generative nucleus. This process arises from a haploid generative nucleus, which can divide to produce two daughter cells, each representing one male gamete.
Step 4
Describe the fate of each of the male gametes.
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One of the male gametes fuses with the egg nucleus to form the zygote, while the other typically fuses with the endosperm nucleus or polar nuclei to form the endosperm, which nourishes the developing embryo.
Step 5
State one method that is used to produce seedless fruits.
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One method used to produce seedless fruits is through the application of growth regulators or selective propagation techniques that allow for the development of fruits without the formation of seeds.
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