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reproduction - Coggle Diagram

- - - - large, brightly coloured petals to attract insects
      - have a scent and nectar to entice insects to visit the flower and push past stamen to get to nectar
      - larger, stickier/spikier pollen grains to attach it insects to be carried away
      - anthers inside flower and firmly attached to brush against insects
      - stigma inside flower and are sticky so pollen grains stick to it when an insect brushes past
  - - - small, dull petals, often green or brown in colour
      - no scent or nectar as no need to waste energy producing then as no need to attract insects
      - large number of small, smooth and light pollen grains so they are easily blown by the wind
      - anthers outside the flower, swinging loose on long filaments to release pollen grains easily
      - stigma outside flower, feathery to catch drifting pollen grains
- - - - Water – allows the seed to swell up, which causes the seed coat (testa) to burst, allowing the growing embryo plant to exit the seed. Water also allows the enzymes in the embryo to start working so that growth can occur (increases metabolic activity)
      - Oxygen – required for respiration, so that energy can be released for germination
      - Warmth – germination improves as temperature rises (up to a certain point) as the reactions which take place are controlled by enzymes, which cannot function effectively when temperatures are too low