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Biology OYO

Module 15 - OYO

QuestionAnswer
15.1 If water is in short supply, a plant wilts but does not die unless the water stays in short supply for a long time. Based on this, which one of the four water-based processes that we discussed can be temporarily neglected? Turgor pressure.
15.2 Some people think that putting plant roots underwater will allow the plant to absorb all of the water it needs. If you do this to most plants, however, it will kill them. Why? Because they can't get enough oxygen and they can't release carbon dioxide into the environment.
15.3 A botanist has two samples of liquid. Sample A is composed primarily of organic materials, while sample B is composed mostly of water and minerals. Which liquid was extracted from the xylem of a plant and which came from the phloem? The organic materials came from the phloem, and the water and minerals came from the xylem.
15.4 Typically, a plant opens its stomata during the day and closes them at night. When would you expect transportation of water to occur, in the day or during the night? During the day.
15.5 Regardless of how you plant a seed, the seedling always sprouts up through the soil. What growth hormore is responsible for this amazing ability? Auxins.
15.6 You see a bean plant that has grown abnormally long and is more yellow than green. What is the most likely reason for this bean plant's appearance. It is not getting enough light.
15.7 In order to be healthy, a Venus flytrap needs insects, water, and what else? Light and carbon dioxide.
15.8 A gardener is experimenting with one of her African violet plants. This plant produces large, deeply colored flowers. She shows you two offspring from the plant. The first produces small, lightly colored flowers, while the second produces large,...
15.8(continued) ... deeply-colored flowers. Which offspring was produced with vegetative reproduction? Which one was produced with sexual reproduction? The second one. The first one.
15.9 A gardener wants to graft a limb from a McIntosh apple tree onto another tree so that he can have more McIntosh apples. Should the gardener graft this limb to his Red Delicious apple tree or to his wild cherry tree? The Red Delicious apple tree.
15.10 Is there any way a plant that produces imperfect flowers can sexually reproduce with itself? Why or why not? Yes. Because two different flowers on the plant can produce different reproductive parts.
15.11 Suppose a flower has a carpel with a very short style. Which would you consider to be the best means of transferring pollen grains to the carpel: the wind or an animal? Animals.
15.12 If a pollen sac contains 1,000 diploid cells before the formation of pollen grains, how many pollen grains could there be in the pollen sac once pollen formation is complete? Four thousand.
15.13 After the original cell of an ovule undergoes meiosis and forms one viable megaspore, how many times does mitosis occur in order to get a total of eight nuclei in the megaspore? Three times.
15.14 Suppose you were blindfolded and asked to smell several flowers. If you encountered a flower with little or no smell, what would be a good guess as to its predominant color? Red.
15.15 Suppose you were on an island with plenty of plant life but essentially no insects or birds. Would you expect to see many flowering plants? Why or why not? No. Because insects and birds pollinate the flowers.
15.16 In Module #7, we used the letter "n" to represent haploid cells, and "2n" to represent diploid cells. Using this notation, how would you represent the zygote formed during double fertilization? How would you represent the endosperm? 2n. 3n.
15.17 The process of a seedling sprouting from a seed is often called "germination." One of the steps in the fertilization process described above is often called germination as well.
15.17(continued) What part of the fertilization process discussed above could be called germination? The formation of the pollen tube.
15.18 The mature bean shown in Figure15.10 has no endosperm. Did it ever have one? If so, what happened to it? Yes. The cotyledons absorbed it.
15.19 If you plant a seed too deep, the seedling will break through the seed and begin to grow. It will die before it reaches the surface, however. Why does the plant die? Because it does not have enough food for the embryo.
Created by: LiseBrinkley
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