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Download Section Review 22-1 1. Plants are multicellular eukaryotes whose
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Section Review 22-1 1. Plants are multicellular eukaryotes whose cell walls are made of cellulose. Plants develop from multicellular embryos and carry out photosynthesis using the green pigments chlorophyll a and b. 2. The four basic needs of a plant are sunlight, water and minerals, gas exchange, and the transport of water and nutrients throughout the plant body. 3. The ancestors of the first land plants were similar to multicellular green algae that are living today. 4. Mosses 5. ferns 6. cone-bearing plants 7. flowering plants 8. The gametophyte generation is haploid and produces sperm and egg cells. The sporophyte generation is diploid and produces spores. 9. Plants created new ecosystems in which other organisms could live. Plants also created organic matter in the Earth’s soil that other organisms could use. 10. Seeds are able to scatter and grow under a variety of conditions, and they are adapted to life on dry land. Section Review 22-5 1. Angiosperms have unique reproductive organs called flowers. Flowers contain ovaries, which surround and protect seeds. Seeds develop within a thick wall of tissue called a fruit. 2. Monocots have one seed leaf and dicots have two seed leaves. 3. An annual will grow from seed to maturity, flower, produce seeds, and die in the course of a single growing season. 4. In its first year, a biennial grows roots, short stems, and sometimes leaves. In its second year, a biennial grows new stems and leaves then produces flowers and seeds. Once the flowers produce seeds, the plant dies. 5. Perennials have life cycles lasting more than two years. Some perennials have herbaceous stems that die every winter and are replaced each spring. Other perennials have woody stems that survive from year to year. 6. monocot 7. dicot 8. dicot 9. monocot 10. A plant that flowers is an angiosperm. If it lives for more than two years, the plant must be a perennial. Some perennials have herbaceous stems that die and are replaced each year.