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Flowers and Reproduction (Flower Structure and Cross-Pollination :explode:…

- - - - Stamens
        
        Collectively as the androecium
        
        Male part of the flower produce pollen
        
        Two parts
        
        Filament
        
        Anther
      - Petals
        
        Broad, flat and thin
        
        Produce volatile fragrances, and insects and bat follow the aroma gradient to the flower.
      - Carpels
        
        Three main parts
        
        a style
        
        that elevates the stigma to a useful position
        
        an ovary
        
        megaspores are produced
        
        a stigma
        
        that catches pollen grains
        
        Constitute the gynoecium
        
        Placenta
        
        Inside the ovary
        
        Ovules
        
        Region of tissue that bear small structures
        
        Nucellus
        
        Ovule has a central mass of parenchyma
      - Sepals
        
        the lowermost and outermost of the four floral appendages
        
        typically the thickest, toughest and waxiest of the flower parts
        
        protect the flower from nectar-robbing insects and birds
  - - - sporophyte generation
        
        One phase of the plant life cycle
      - Two Generations
        
        sporophyte and gametophyte
        
        alternation of generations
      - Microgametophytes
        
        Male
      - Megagametophytes #
        
        Female
      - Two types of spores
        
        Microgametophytes from microspores
        
        Megagametophytes from megaspores
      - Gametes can fuse with other gametes in a process called fertilization.
      - Gamets
        
        Egg
        
        Sperm
      - Spore
      - Zygote
- - - - technical term for a multinucleate megagametophyte
    - - Large
    - - two
    - - Thrre small
    - - two synergids
- - - - It is pollination of a carpel by pollen from the same flower or another flower on the same plant.
  - - - Flowers that lack either or both essential organs are not only incomplete
    - - It may lack either sepals or petals or both
    - - they produce the critically important spres
    - - Sepals and petals do not produce spores
    - - Only carpellate flowers
    - - Having staminate flowers
- - - - fruits containing only ovarian tissue
    - - present of nonovarin tissue