Chapter 10-plant reproduction


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Chapter 10-plant reproduction

  1. 1. Plant Reproduction Chapter 10
  2. 2. Types of reproduction in Plants <ul><li>Sexual- This requires the production of both male and female sex cells, sperm and egg, in reproductive organs. </li></ul><ul><li>Asexual- this doesn’t require sex cells. And one parent can reproduce an exact genetic copy of itself. </li></ul><ul><li>Plants use both in order to reproduce. </li></ul>
  3. 3. Asexual vs. Sexual Reproduction <ul><li>A lot of plants use asexual reproduction to reproduce. Like potatoes and grass. </li></ul><ul><li>They can do this because their cells have the ability to reproduce a whole organism with out the need for sex cells. </li></ul><ul><li>Sexual reproduction, needs sex cells to happen. One way that a plant sperm and egg meet is by an insect carrying pollen to another plant or the wind can do this as well. </li></ul>
  4. 4. Sexual Reproduction <ul><li>Sex cells need to join and fertilize each other inside of sex organs. </li></ul><ul><li>Some plants can have both male (sperm) and female sex organs (eggs), and can reproduce sexually by themselves. </li></ul><ul><li>Some plants, like holly plants, only have either male or female organs and have to be close to another holly plant in order to reproduce. </li></ul>
  5. 5. Plant Life Cycle H.W. pg 277 ques 1-4 <ul><li>There are 2 stages to the plant life cycle: </li></ul><ul><li>Gametophyte stage- here sex cells undergo meiosis to produce haploid cells called spores. These spores undergo cell division and form new sex cells. </li></ul><ul><li>Sporophyte stage- here fertilization occurs, and 2 haploid sex cells (male and female) join, to give a new diploid offspring. </li></ul>
  6. 6. Seedless reproduction <ul><li>Plants like ferns that do not have seeds reproduce using spores. They produce haploid spores that are covered with a spore case, to protect them. </li></ul><ul><li>When the cases break open they can then fertilize other sex cells and reproduce. </li></ul><ul><li>H.W. read about the moss and fern life cycles and do ques. 1-4 on pg 281 </li></ul>
  7. 7. Seed plant reproduction (angiosperms & gymnosperms) <ul><li>Here male organs produce sperm in the form of pollen. The pollen can then be carried to the egg in the female organs by wind, insects, water, etc… </li></ul><ul><li>When they become fertilized that is called pollination. </li></ul>
  8. 8. Pollination <ul><li>After fertilization of the egg by the pollen, the egg develops into a seed, or an embryo, that contains food and a hard protective coating. </li></ul><ul><li>This embryo eventually develops into the new plants stems, roots, and leaves. </li></ul><ul><li>The stored food in the seed allows the plant to grow more rapidly than a spore. </li></ul>
  9. 9. Gymnosperm reproduction <ul><li>Firs, cedars and pines all produce both male and female cones. </li></ul><ul><li>The smaller male cones contain the pollen and the larger female cones hold the eggs in a ovule. </li></ul><ul><li>When they interact by wind or insects they pollinate. </li></ul>
  10. 10. Angiosperm Reproduction <ul><li>Angiosperms are flowering plants that produce seeds. </li></ul><ul><li>Flowers are important b/c they hold the reproductive organs that produce the sperm and eggs of angiosperms. </li></ul>
  11. 11. Flower structure <ul><li>Sperm is made as pollen in the Stamen of a plant. The stamen contains an anther and a thin stalk called a filament. </li></ul><ul><li>Female organs are located in the pistil, which contains a stigma at its tip that is sticky and allows pollen to land on it. </li></ul><ul><li>The plants style, runs down from the stigma and leads the pollen to the ovary, which holds the ovule that makes the eggs. </li></ul>
  12. 14. Plant Germination H.W. pg 300 ques 1-10 <ul><li>The growth of a plant from a seed to a mature plant is called germination </li></ul><ul><li>All plants germinate at different rates, some slow some fast. </li></ul><ul><li>This rate also depends on the environmental conditions that the plant is in. </li></ul><ul><li>Temperature, amount of water, and light all effect germination of plants. </li></ul>