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Biology Lesson 1.3

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1. BiologyLesson 1.3 2. The Nitrogen Cycle – process of convertingnitrogen to nitrates and then back to nitrogen. Textbook page 13 3. Legume plantsãImportant to the…
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  • 1. BiologyLesson 1.3
  • 2. The Nitrogen Cycle – process of convertingnitrogen to nitrates and then back to nitrogen. Textbook page 13
  • 3. Legume plants•Important to the nitrogen cycle•Have nitrogen-fixing bacteriathat live in roots•Convert nitrogen to nitratesthat plants need to make proteins
  • 4. Legume Plants •Important to the nitrogen cycle •Have nitrogen-fixing bacteria that live in roots •Convert nitrogen to nitrates that plants need to make proteins• includes peanuts, alfalfa,clover, peas, beans
  • 5. Legume Plantsincludes peanuts, alfalfa, clover, peas, beans •are important to farmers •are plowed under, decompose, and put important nitrates back into the soil
  • 6. Other important facts about thenitrogen cycle: denitrifying bacteria convertextra nitrates in the soil back tonitrogen in the air
  • 7. Other important facts about the nitrogen cycle:denitrifying bacteria convert extra nitrates in the soil back to nitrogen inthe air lightning causes nitrogen inair to become nitrates in airwhich rain will carry to soil
  • 8. Various Lifecycles of Plants:1. Annuals –develop from aseed, make new seeds, anddie in one growing season.ex. peas,grains, marigolds
  • 9. Various Lifecycles of Plants:1. Annuals –develop from a seed, make new seeds, and die in one growingseason. ex. peas,grains, marigolds2. Biennials – complete lifecycle in2 years or 2 growing seasons.1st year they store food but don’tgrow big or bloom.2nd year they grow and produceflowers and seeds. ex. Carrots, Geraniums
  • 10. Various Lifecycles of Plants:2. Biennials – complete lifecycle in 2 years or 2 growing seasons.1st year they store food but don’t grow big or bloom.2nd year they grow and produce flowers and seeds.ex. Carrots, Geraniums3. Perennials – live manyyears and bloom eachseason. Ex. wildflowers, asparagus
  • 11. Most plants belong to a groupcalled angiosperms.Angiosperms are floweringplants with seeds and can bedivided into 2 categories basedon the number of cotyledons inthe seed.
  • 12. Monocot vs. DicotCotyledon – a seed leaf in aplant embryo that containsstored food for the embryo.
  • 13.  monocots – one cotyledons
  • 14. dicots – two cotyledons
  • 15. Have fibrous roots
  • 16. Have a taproot
  • 17. Symmetry in biology is thebalanced distribution ofduplicate body parts orshapes. There are 2 types of symmetry:
  • 18. There are 2 types of symmetry: 1. Radial symmetry Can cut the flower in half inany direction, both halves look identical
  • 19. There are 2 types of symmetry:1. Radial symmetry - Can cut the flower in half in any direction, both halves lookidentical2. Bilateral symmetry-Can cut only inhalf lengthwiseand have identicalhalves.
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