Animations   Movies   Words  Appendix  Summary  Art  Art 
Chapter 38 Quizzes: Self Activities Chapter Cum.
Unit 6: Plant Form and Function Angiosperm Reproduction and Biotechnology Review
  1. Angiosperms such as the parasitic Rafflesia arnoldii produce from the generation for sexual reproduction.
     
     
  2. Flowers are composed of four floral organs: , , , and , and exhibit wide variation among species. A plant that has male and female reproductive structures on the same individual is ; if those structures are on separate plants the species is .
     
     
  3. The transfer of pollen from an to a results in .
    • Pollen grains develop from within the of .
    • Embryo sacs develop from within .
     
     
  4. After pollination, a pollen grows down into the and discharges two .
     
     
  5. One sperm fertilizes the to form the , the other combines with the nuclei, producing a triploid in a process called fertilization.
     
     
  6. A typical dicot embryo consists of the , , , and two , enclosed by a protective seed . A typical monocot embryo has one , whith a covering the young shoot (epicotyl), and a which protects the young root (radicle) during germination.
     
     
  7. A fruit develops from the , protects and aids in the dispersal of the enclosed seeds.
     
     
    Review: Angiosperm Life Cycle. Video: Time Lapse of Flowering Plant Life Cycle
 Animations   Movies   Words  Appendix  Summary  Art  Art 
Chapter 22 Quizzes: Self Activities Chapter Cum.
Unit 4: Mechanisms of Evolution Descent with Modification Review
  1. The Origin of Species, published by Charles Darwin in 1859, provided key concepts in understanding the diversity of life through of .
     
     
  2. Darwin's ideas can be summarized as with : all organisms are related by being descendants of a common , with modification among the descendants. This is summarized in inferences based on observations.
    • Observation #1: of offspring: many species produce more progeny than can possibly survive.
       
       
    • Observation #2: Populations tend to remain in size over time.
       
       
    • Observation #3: Resources are limited.
      • Inference #1 ( for existence): There is a struggle for among individuals of a population.
       
       
    • Observation #4: Members of a population exhibit in their characteristics.
       
       
    • Observation #5: Much of this variation is .
      • Inference #2 ( selection): Individuals whose traits give them a high probability of and are likely to leave more than other individuals.
      • Inference #3 ( ): A population will gradually accumulate favorable characteristics over generations and become more to its environment.
     
     
  3. Humans have modified other species over generations by and breeding individuals that possess desired traits. Darwin called this selection.
     
     
  4. Drug resistance in bacteria and viruses such as HIV are probably due to and for individual organisms that possess the resistance.
     
     
  5. anatomical structures, such as the among mammals, provide evidence of common ancestry with modifications.
     
     
  6. Comparative reveals anatomical not visible in adults.
     
     
  7. finds that closely related species tend to be found in the same region; the same ecological in distant regions are occupied by different (though sometimes similar–looking) species by evolution.
     
     
  8. Darwin's theory of evolution predicts forms during the evolution of species, and this is supported by records.
     
     
  9. homologies provide the latest support for Darwin's theory of evolution.
bio1903 Home Oct 22, 2006 Print Print