Question

Plant Diversity The scales of the female cones bear ovules, which enclose the female sporangia. Cells in the female sporangia also undergo meiosis to produce spores. One of the spores from each meiotic division develops into a female gametophyte by mitosis. As the pollen germinates and produces sperm nuclei by mitosis, the female gametophyte produces an egg. One sperm nucleus reaches the egg through the pollen tube and fertilizes it. Notice in Figure 6 that the male gametangium has been eliminated, and the sperm is now merely a nucleus rather than a motile cell. Through mitotic divisions, the zygote becomes an embryo. The female gametophyte remains as a food supply for the developing embryo to use when the seed germinates, and a protective seed coat is formed by the sur- rounding sporophyte tissues in the pine cone, Procedure 1. Look at Figure 6 and label the arrows that indicate where mitosis, mei- osis, and fertilization occur. 2. Identify the following structures in the living material and label them on Figure 6: - Sporophyte Male gametophyte (pollen) - de Female spores Sperm nucleus Female gametophyte Zygote 2 wont Egg Embryo Sei Male spores With a colored pencil, color all of the haploid structures in Figure 6. Describe the difference between pollination and fertilization Pollination is the transfer of pollen to a conc or femall flower, succsesful pollination results in fect:1;&ation unce and ed is producerl. How does the sperm get to the egg? How does the gametophyte obtain its food (is it autotrophic or heterotrophic)? How does the sporophyte obtain its food (is it autotrophic or heterotrophic)? Which phase of the life cycle is larger and lives longer?

Answer 1

C 3. With a colored pencil, color all of the haploid structures in Figure 6. Describe the difference between pollination and fertilization. Pollination is the transfer of pollen to a conc or femall flower, succsestul pollination results in fertilization once and egg is produced. How does the sperm get to the egg? sperm travels to egg by style of pistil How does the gametophyte obtain its food (is it autotrophic or heterotrophic)? heterotrophic, dependent upon sporophyte How does the sporophyte obtain its food (is it autotrophic or heterotrophic)? autotrophic, performs photosynthesis Which phase of the life cycle is larger and lives longer? sporophyte (diploid)

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