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7th Grade Ch. 2 Sec. 3 Insects
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7th Grade Ch. 2 Sec. 3 Insects

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  • 1. Ch. 2 Sec. 3 YouTube video-Bill Nye Insects song
  • 2.  
  • 3. Humans are definitely outnumbered!
    • For every pound of humans, there are 300 pounds of insects! So if you weigh 50 pounds, your share of insects weighs 15,000 pounds! That's as much as 7 cars!  
    • How much do you weigh in insects?
  • 4. It's a good thing insects can't vote!
    • If they could, they would rule the Earth!  There are a lot more insects than people!  If all the insects in the world were divided up, and you got your share, guess how many you would get.   
    200 million There are over a million known species of insects.
  • 5.  
  • 6. Insect Body Structure
    • 3 body sections- head, thorax & abdomen
    • 6 legs
    • 1 pair of antennae
    • usually 1or 2 pairs of wings
    - Insects
  • 7.
    • legs & wings attached to thorax
  • 8. Obtaining food
    • insect’s mouthparts adapted for eating specific foods
  • 9.
    • butterfly’s mouth- shaped like coiled tube- can be uncoiled like straw to suck up nectar
  • 10.  
  • 11. Some flies- sponge-like mouthpart to lap up decaying flesh
  • 12. Ant- sharp edged chewing mouthparts
  • 13. Leaf cutter ants
  • 14.  
  • 15. 2 types of insect metamorphosis
    • complete metamorphosis
    • incomplete (gradual) metamorphosis
  • 16. complete metamorphosis
    • 4 different stages: egg, larva, pupa, & adult
    - Insects
  • 17. Life cycle of the monarch butterfly
      • E gg  L arva  P upa  A dult
  • 18. gradual metamorphosis
    • no distinct larval stage
    • egg hatches into a stage called a nymph , usually looks like adult insect w/out wings
    - Insects
  • 19. Complete Metamorphosis Adult insect Egg Larva Pupa - Insects
  • 20. Insects and Metamorphosis
    • Name an insect that goes through complete metamorphosis, and an insect that goes through incomplete metamorphosis.
    • How are the 2 types of metamorphosis different? The same?
  • 21. Insect defenses
    • stinkbug- bad odor
    • bees- sting
    • camouflage = protective coloration
    • mimic larger animals
    moth caterpillar defends itself by mimicking a snake
  • 22.  
  • 23.  
  • 24. One of the most common defenses against predators is camouflage.
  • 25. Can you find the creature?
  • 26. Most insects are harmless or beneficial to people.
  • 27. Controlling insect pests
    • Insects can damage crops
    • Pesticides
  • 28. INSECT QUIZ TEST YOUR KNOWLEDGE !
  • 29. Insects do not have a backbone.
    • True or False
  • 30. TRUE Insects are invertebrates. They have an exoskeleton instead of a backbone.
  • 31. The three sections of an insect’s body are called the mandible, the antenna, and the wing.
    • True or False
  • 32. FALSE
  • 33. How many different species of insects are there?
  • 34.
    • There are over a million species of insects. Insects outnumber all other animals at a rate of 4 to 1.
    • The biggest group of insects are the beetles, numbering around 330,000 species.
  • 35. Spiders are insects.
    • True or False
  • 36. FALSE Spiders are arachnids. They only have 2 body sections, while insects have 3 body sections.
  • 37. Insects live just about everywhere on earth. True or False
  • 38. TRUE
  • 39. Insects do not spread disease. True or False
  • 40. FALSE
  • 41. When an insect first comes out of its egg it is called a larva. True or False
  • 42. TRUE larva
  • 43. Camouflage Activity Table # Total # # of green 1 31 4 2 26 4 3 25 2 4 26 5 5 45 9 6 23 4