Answer the following questions from your knowledge of sexual reproduction in flowering plants - Leaving Cert Biology - Question 16 (d) - 2022
Question 16 (d)
Answer the following questions from your knowledge of sexual reproduction in flowering plants.
(i) State the collective term used to describe the anther and filamen... show full transcript
Worked Solution & Example Answer:Answer the following questions from your knowledge of sexual reproduction in flowering plants - Leaving Cert Biology - Question 16 (d) - 2022
Step 1
State the collective term used to describe the anther and filament of the flower.
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Answer
Stamen is the collective term used to describe the anther and filament of the flower. It is the male reproductive part that produces pollen grains.
Step 2
Outline the main events in the development of pollen grains in the anther.
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Answer
The development of pollen grains in the anther involves several key events:
The diploid microspore mother cell undergoes meiosis to produce four haploid microspores (or pollen grains).
Each microspore divides by mitosis to form a pollen grain that consists of two nuclei: the generative nucleus and the tube nucleus.
The pollen grains mature and are eventually released from the anther.
Step 3
What is meant by the term pollination?
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Answer
Pollination refers to the transfer of pollen from the anther of a flower to the stigma of the same or another flower, which is essential for fertilization to occur.
Step 4
Name two methods by which pollination can occur.
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Answer
Two methods by which pollination can occur are:
Wind
Insects (or other animals)
Step 5
Describe the main events that occur immediately after pollination.
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Answer
After pollination, the following main events occur:
Pollen grains germinate, producing a pollen tube that grows down the style towards the ovary.
The pollen tube enters the ovule where the generative nucleus divides by mitosis to form two male nuclei, one of which fertilizes the egg cell to form the diploid zygote, while the other fuses with the two haploid polar nuclei to form a triploid endosperm.
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