16.3. Sexual reproduction in plants
A subsection of Biology, 5090, through 16. Development of organisms and continuity of life
Listing 10 of 158 questions
shows some parts of an insect-pollinated and a wind-pollinated flower. Using the letters F, G, H, I and J, list the parts that are from the insect-pollinated flower: the wind-pollinated flower: In the table below, identify parts H, I and J and state the function of each. Explain how the structure of part H helps it to carry out its function. F G H I J Use part name function H I J [T shows a pollen grain with its pollen tube. On , use a line labelled L to show exactly where the pollen grain as shown in is found. State and explain the difference between a nucleus in a pollen grain and a nucleus found in a cell in structure I.
5090_s05_qp_2
THEORY
2005
Paper 2, Variant 0
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Use shows a section through a flower and also what happens to some of its parts during the plant’s life. young flower x 2 x 6 stigma ovule stigma magnified M N P fruit x 2 x 2 Examiner’s Use Identify structures M. Structures M have come from another flower. Describe how structures M have been transferred and become attached to this stigma. Describe what happens to the ovule inside the young flower for it to develop into structure N inside the fruit. Name the process occurring at P.
5090_s06_qp_2
THEORY
2006
Paper 2, Variant 0
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shows sections through two different flowers, A and B, that are found on the same plant. One flower is male, the other is female. C flower A flower B C Identify C on State which flower is the male flower and give a reason. flower reason Examiner’s Use State the method of pollination in this plant and give two reasons for your answer. method of pollination reason 1. 2. State two other possible features, not visible on , that are likely to be present in these flowers. 1. 2. In some species, plants with only male flowers occur while other plants have only female flowers. Explain the advantages of this to the species.
5090_s07_qp_2
THEORY
2007
Paper 2, Variant 0
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shows a section through a flower. A pollen grain has been deposited on the carpel. E pollen grain F G H I D Name the process that has occurred in bringing the pollen grain to the carpel. State how this process has been brought about in this flower and give two reasons for your answer. how the process has been brought about reason 1 reason 2 On , draw and label the pollen tube and the nuclei as they would appear just before the nuclei fuse. Changes occur in the flower after the nuclei fuse. Use the letters in to identify • the parts of the flower that will die as the fruit is formed • the part of the flower that will form the testa • the part of the flower that will form the fruit wall.
5090_s11_qp_21
THEORY
2011
Paper 2, Variant 1
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Questions Discovered
158