practice test #2

practice test #2 - 1. Staminate flowers are a. complete b....

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Unformatted text preview: 1. Staminate flowers are a. complete b. incomplete c. perfect d. imperfect e. both b and d 2. Which of the following is not a role that auxin plays in plant development? a. apical dominance b. leaf abscission c. synthesis of digestive enzymes by barley seeds d. root initiation e. parthenocarpic fruit development 3. Phototropism is a. the growth of plant structures toward or away from light. b. the growth of plant structures in response to pressure. c. the movement of solutes between plant cells. d. the growth of plant structures in response to gravity. e. the process of plant photosynthesis. 4. Phytochrome a. is a nucleic acid. b. exists in two forms interconvertible by light. c. is a pigment that is colored red or far red. d. is sometimes called the stress hormone. e. is the photoreceptor for phototropism. 5. Generative cells a. are diploid. b. travel behind the tube nucleus. c. divide by meiosis. d. produce two diploid sperm cells. e. all of the above 6. megaspore mother cells a. are diploid. b. are found in the ovule. c. undergo meiosis to produce four hapoid megaspores. d. are also known as megasporocytes e. all of the above 7. Which of the following determines whether a photoperiodic plant will flower or not? a. if the day is long. b. if the day is short c. if the day is bright d. the weather at night. e. the length of the night 8. The one surviving megaspore undergoes a. three rounds of mitosis to produce six haploid nuclei. b. two rounds of mitosis to produce six haploid nuclei. c. three rounds of mitosis to produce nine haploid nuclei. d. two rounds of mitosis to produce four haploid nuclei. e. three rounds of mitosis to produce eight haploid nuclei. 9. To reach the egg sac, reach the egg sac, a ____ ____ that has landed on the _____ begins to germinate, sending a long pollen tube through the _____ and _____. a. pollen grain, style, ovary, stigma b. pollen tube, stigma, ovary, style c. pollen grain, stigma, ovary, style d. pollen tube, stigma, ovary, style e. pollen grain, ovary, stigma, style 10. Which statement about double fertilization is true? a. One sperm nucleus fuses with the egg nucleus. b. It never occurs by accident. c. One of its products is a diploid endosperm. d. It is found in all angiosperms. e. One sperm nucleus fuses with three polar nuclei....
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practice test #2 - 1. Staminate flowers are a. complete b....

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