Download Section Review 22-1 1. Plants are multicellular eukaryotes whose

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.