7th Grade Ch. 2 Sec. 3 Insects
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Transcript of 7th Grade Ch. 2 Sec. 3 Insects
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Ch. 2 Sec. 3
YouTube video-Bill Nye Insects song
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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?
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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.
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- InsectsInsect Body Structure• 3 body sections- head, thorax & abdomen
• 6 legs
• 1 pair of antennae
• usually 1or 2 pairs of wings
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legs & wings attached to
thorax
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Obtaining food
• insect’s mouthparts adapted for eating specific foods
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•butterfly’s mouth- shaped like coiled tube- can be uncoiled like straw to suck up nectar
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Some flies- sponge-like mouthpart to lap up decaying flesh
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Ant- sharp edged chewing mouthparts
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Leaf cutter ants
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2 types of insect metamorphosis
• complete metamorphosis
• incomplete (gradual) metamorphosis
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- Insects
complete metamorphosis• 4 different stages: egg, larva, pupa, & adult
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Egg Larva Pupa Adult
Life cycle of the monarch butterflyLife cycle of the monarch butterfly
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- Insectsgradual metamorphosis• no distinct larval stage
• egg hatches into a stage called a nymph, usually looks like adult insect w/out wings
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Complete Metamorphosis
Adult insect
Egg
Larva
Pupa
- Insects
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Insects and Metamorphosis
1. Name an insect that goes through complete metamorphosis, and an insect that goes through incomplete metamorphosis.
2. How are the 2 types of metamorphosis different? The same?
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Insect defenses
• stinkbug- bad odor
• bees- sting
• camouflage= protective coloration
• mimic larger animals
moth caterpillar defendsitself by mimicking a snake
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One of the most common defenses against predators is camouflage.
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Can you find the creature?
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Most insects are harmless or beneficial to people.
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Controlling insect pests
• Insects can damage crops
• Pesticides
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Insects do not have a backbone.
True or False
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TRUEInsects are invertebrates. They have an exoskeleton instead of a backbone.
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The three sections of an insect’s body are called the mandible,
the antenna, and the wing.
True or False
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FALSE
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How many different How many different species of insects are species of insects are
there?there?
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• There are over a millionover 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.
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Spiders are insects.Spiders are insects.
True or FalseTrue or False
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FALSESpiders are arachnids. They only have 2 body sections, while insects have 3 body sections.
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Insects live just about everywhere on earth.
True or False
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TRUE
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Insects do not spread disease.
True or False
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FALSE
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When an insect first comes out of its egg it is called a larva.
True or False
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Camouflage Activity
Table # Total # # of green
1 31 4
2 26 4
3 25 2
4 26 5
5 45 9
6 23 4