HW #30 - AP Biology Period 4 #22 Liem Nguyen 2/1/10...

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AP Biology Period – 4 #22 Liem Nguyen 2/1/10 Homework #30 (90220): Chapter 30 (due Friday 90220) Total points: 40 for Attempt on all questions Concept Map: 10 Points Chapter 30: Plant Diversity II: The Evolution of Seed Plants Objectives Key Terrestrial Adaptations Were Crucial to the Success of Seed Plants 1. Name five terrestrial adaptations that contributed to the success of seed plants. success of seed plants reduction of gametophyte generation heterospory, ovules, and development of pollen The five terrestrial adaptations were very important in the success of seed plants. These five adaptations were the development of the seed, the reduction of the gametophyte generation, heterospory, ovules, and the development of pollen. 2. Compare the size and independence of the gametophytes of bryophytes with those of seed plants. bryophytes – microscopically small (visible to naked eye) self-sufficient, life on their own receive nutrients from parents The gametophytes of bryophytes are small but visible to the naked eye. The gametophytes of seed plants are microscopically small. The gametophytes of bryophytes are self-sufficient and must live on their own. The gametophytes of seed plants get their nutrition from the parent. 3. Describe the ovule of a seed plant. ovule structure – gives rise to, contains female reproductive cells 3 part – integuments, megasporangium, megagametophyte The ovule of a seed plant is the structure that gives rise to and contains the female reproductive cells of the plant. There are 3 parts to this ovule: the integuments, the megasporangium, and the megagametophyte. 4. Contrast the male gametophytes of bryophytes with those of seed plants. flagellated (swim few centimeters) no flagella (drift long distances) pollen tube to see egg cell The male gametophytes of bryophytes are flagellated and swim a few centimeters through a film of water to reach the egg cell. The male gametophytes of seed plants have no flagella so they drift long distances in the air as pollen and reach the egg cell through a pollen tube.
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5. Explain why pollen grains were an important adaptation for successful reproduction on land. no water or motility carried to the pollen tube successful reproduction on land Because the sperm does not require water or motility, the pollen is carried to the pollen tube, then conveying the sperm to the ovule. This allows successful reproduction on land, which is especially important for land plants. 6. Explain how a seed can be said to include contributions from three distinct generations. sperm swims through film of water female gametophyte never leaves male gametophyte are durable sperm are not flagellated Free-living gametophytes release flagellated sperm that have to swim through a film of water, but modern-day seeds include a female gametophyte which never leaves and male gametophytes which are durable. Also, the sperm is no longer flagellated. Through these generations, the seed has been able to adapt to the terrestrial conditions it exists in now.
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HW #30 - AP Biology Period 4 #22 Liem Nguyen 2/1/10...

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