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Reproduction in Plants - Coggle Diagram

- - - - Ensure continuity of a species
  - - - Each daughter cell (2n) has same no. of chromosomes as parent cell (2n)
      - Have same type & amt. of genes as parent cell
      - Offspring prod. are called clones
  - - - Each daughter cell has half (n) no. of chromosomes as parent cell (2n)
- - - - Attracts insects for pollination
  - - - Produces pollen grains
        
        Have haploid set of chromosomes
        
        Each pollen grain has 2 nuclei
        
        Generative nucleus
        
        Pollen tube
      - Made up of two lobes
        
        Each cont. two pollen sacs
      - Cont. vascular bundle
        
        Phloem + Xylem
    - - Holds anther in a suitable position to disperse pollen grains
  - - - Swollen struct. tht. receives pollen grains
      - Secretes sugary fluid to stimulate the germination of pollen grains
    - - Connects stigma to ovary
      - Holds stigma in suitable position to trap pollen grains
    - - Cont. one or more ovules
    - - Cont. ovum
      - Cont. definitive nucleus
- - - - Brings tgt. the male & cemale gametes for fertilisation to take place
  - - - More varieties of offspring prod.
        
        Leads to greater genetic variation
        
        Offspring can inherit beneficial qualities from both parents
        
        Seeds prod. capable of surviving longer before germination
    - - Two diff. plants of same species req.
      - Dependent on external factors for pollination
      - Mre. energy & pollen wasted
      - Less likely to occur (as compared to self pollination)
    - - Dioecious (Bigender)
        
        Bear either male or female flowers
        
        Self fertilisation impossible
      - Bisexual
        
        Anthers & stigmas mature @ diff. times
        
        Stigmas of plant situated a distance away frm. anthers
  - - - Offpsring prod. genetically similar to parents
      - Continued self pollination may lead to offspring becoming weaker, smaller, less resistant to disease
    - - Beneficial qualities passed down frm. parent plant to offspring
      - Only one parent required
      - Not dependent on external factors for pollination
      - More likely to take place, stigma closer to anthers
      - Less pollen & energy wasted
    - - Bisexual
        
        Anthers & stigmas maturing at the same time
        
        Stigma situated directly below anther
        
        Certain flowers nvr. open, only self pollination can happen
  - - - Large
      - Brightly coloured
    - - Present
    - - Fragrant
      - Sweet smelling
    - - Small, compact
      - Do not protrude out of flowers
    - - Not pendulous (Drooping)
      - Do not protrude out of flowers
    - - Fairly abundant
      - Larger w. rough surf.
    - - Present
  - - - Absent
      - Small
      - Dull coloured
    - - Absent
    - - Absent
    - - Large, feathery
      - Protrude out of flowers
    - - Long, pendulous filaments
      - Protruding anthers
    - - More abundant
      - Tiny w. smooth surf.
    - - Absent
- - - - Same no. of chromosomes as parent cell (2n)