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respiration in plants, Link Title - Coggle Diagram

- - - - connects stigma to ovary
    - - contains1 or more ovules
    - - swollen structure that recieves pollen grains
    - - -contains ovum and definitive nucleus -attachedto placenta by stalk called funicle
  - - - holds anther in suitable position to disperse pollen grains
    - - -produces pollen grains , made up of 2 lobes , each containing 2 pollen sacs
        -contains vascular bundle
- - - - -produces an offspring that is genetically identical to the parent ( same type and amt of genes as parent cell )
        -offspring called clones
    - - -involves the fusion of reproductive cells called gametes to produce a genetically dissmilar offspring
        -male gametes fuses with a female gamete in process called fertilisation
        
        nuclei of the 2 gametes fuse to form zygote which has the same no. of chromosomes as the parent cell
- - - - -invovles the transfer of pollen grains to flower of another plant of the same species
        
        advantages
        
        seeds produces are capable of surviving longer before germination
        
        offspring can inherit beneficial qualities from both parents
        
        more varities of offspring produced which leads to greater genetic variation
        
        disadvantages
        
        dependant on external factors for pollination
        
        less likely to occur as compared to self pollination
        
        more energy and pollen wasted
        
        2 different plants of same species required
    - - involves transfer of pollen grains to stigma of the same flower or differnet flower in the same plant - flowers are bisexual with anthers and stigmas maturing at the same time
        
        advantages
        
        not dependent on external factors for pollitnation
        
        more likely to take place since stigmas are closer anthers
        
        beneficial qualities are passes down from parent plant to offspring
        
        less pollen and energy wasted
        
        only one parent required
        
        disadvantages
        
        continued self pollination may lead to offspring becoming weaker , smaller and less resistant to diseases
        
        offspring produced are gentically similar to parents causing fewer varieties of offspring
- - - - lower male flower
        
        long filaments
        
        2 iodicules
        
        3 stamens
      - upper bisexual flower
        
        contains ovary
        
        2 long feathery stigmas
        
        3stamens
        
        2 iodicules