1. Lesson 2B - Complete and Incomplete Metamorphosis
INTRODUCTION Science Science II: Earth & Life Sciences I Mr. Kishore Lal
Living Things
Lesson 2B - Complete and Incomplete Metamorphosis

2. Complete and Incomplete Metamorphosis
What is metamorphosis?
Metamorphosis means "change".
Metamorphosis refers to the way form changes as certain organisms are born, develop, grow, and change.
What’s the difference?
Two Types of Metamorphosis
Incomplete Metamorphosis - has THREE stages
Complete Metamorphosis - has FOUR stages.

3. Complete and Incomplete Metamorphosis
Incomplete Metamorphosis - 3 Stages
Egg
Nymph
Adult
Eggs
A female insect lays eggs.
These eggs are often covered by an egg case which protects the eggs and holds them together.

4. Complete and Incomplete Metamorphosis
Nymph
The eggs hatch into nymphs.
Nymphs looks like small adults, but usually don't have wings.
Insect nymphs eat the same food as the adult.
Nymphs shed or molt their exoskeletons (outer casings made up of a hard substance
(called chitin) and replace them with larger ones several times as they grow.
Most nymphs molt 4-8 times.

5. Complete and Incomplete Metamorphosis
Adult
The insects stop molting when they reach their adult size.
By this time, they have also grown wings.
Insects with Incomplete Metamorphosis…
Praying Mantis
Dragon fly
Water bug
Cockroach
Grasshoppers
Aphids

6. Complete and Incomplete Metamorphosis
Complete Metamorphosis - 4 Stages
Egg
Larva
Pupa
Adult
Eggs
A female insect lays eggs.
These eggs are often covered by an egg case which protects the eggs and holds them together.

7. Complete and Incomplete Metamorphosis
Larva
Larva hatch from the eggs.
They do not look like adult insects.
They usually have a worm-like shape.
Caterpillars, maggots, and grubs are all just the larval stages of insects.
Larvae molt their skin several times and they grow slightly larger.

8. Complete and Incomplete Metamorphosis
Pupa
Larva make cocoons around themselves.
Pupa don't eat while they're inside their cocoons.
Their bodies develop into an adult shape with wings, legs, internal organs, etc.
This change takes anywhere from 4 days to many months.

9. Complete and Incomplete Metamorphosis
Adult
Inside the cocoon, the pupa change into adults.
After a period of time, the adult breaks out of the cocoon.
Insects with Complete Metamorphosis…
Lady bug
Butterfly
Mosquito
Fleas
Wasps
Flies

10. Complete and Incomplete Metamorphosis
Frogs
Frogs undergo a different type of complete metamorphosis.
From the egg emerges a tadpole, which lives in the water, breathes with gills, and has a tail.
As the tadpole grows, lungs and legs form, and the gills and tail are absorbed into the body.

11. Complete and Incomplete Metamorphosis
Quiz
What are the two types of metamorphosis?
Complete
Incomplete
How many stages are there in incomplete metamorphosis?
Answer: 3
How many stages are there in complete metamorphosis?
Answer: 4
Name the stages in complete metamorphosis.
Egg
Larva
Pupa
Adult

12. Complete and Incomplete Metamorphosis
Quiz
Label all the stages.

13. Complete and Incomplete Metamorphosis

14. Complete and Incomplete Metamorphosis
Quiz
Complete or Incomplete Metamorphosis?
Answer
Complete Metamorphosis?

15. Complete and Incomplete Metamorphosis
Quiz
Complete or Incomplete Metamorphosis?
Answer
Incomplete Metamorphosis?

16. Complete and Incomplete Metamorphosis
END