Gen bio

• Levels of Biological Organization

  • Cell
  • Tissue
  • Organ
  • Organ System
  • Organism
• Animal Cell


  • Irregular shape
  • No cell wall
  • No chloroplasts
  • Presence of lysosomes
  • Presence of centrosomes
• Plant Cell


  • Rigid shape
  • Cell wall is present
  • Large central vacuole
  • Has Chloroplasts
  • Lack centrosomes
  • Lack Lysosome
• Flowers


  The reproductive shoots of the angiosperm sporophyte, are typically composed of four whorls of highly modified leaves called floral organs, which are separated by very short internodes
• Floral Organs


  • Sepals
  • Petals
  • Stamens
  • Carpels (Pistils)
• Stamen


  The male reproductive part of the flower that typically consists of a pollen-containing anther and a filament
• Anther


  The part of the stamen where the chambers within the anther are
• Filament


  A long stalk-like structure which supports the anther
• Types of Flowers


  • Complete
  • Incomplete
• Complete Flower


  Built with 4 parts including sepal, petals, pistils, and stamens
• Incomplete Flower


  If any of the sepals, petals, pistils, and stamens, which are integral in forming a flower, is missing
• Flowers based on Reproductive Whorls

  • Perfect
  • Imperfect
• Perfect Flower


  Both male and female reproductive structures are present
• Imperfect Flower


  • Does not have both male and female structures
  • Staminate - male
  • Carpellate/Pistillate - female
• Complete flowers are always perfect flowers, which contain male and female parts. However, not all perfect flowers are complete
• Carpel


  The female reproductive organ of a flower that consists of an ovary, a stigma, and a style and may be single or may be present in a group in some plants
• Stigma


  Sticky structure that serves as a landing platform for pollen
• Style


  Long, slender neck which has the stigma sitting on top
• Ovary


  Found at the base which prepares the flower for fertilization and fruit