chapter 3: life cycles and biological change lesson 12: life cycles and metamorphosis
TRANSCRIPT
Chapter 3:Chapter 3:Life Cycles and Life Cycles and Biological ChangeBiological Change
Lesson 12: Lesson 12:
Life Cycles and MetamorphosisLife Cycles and Metamorphosis
SourceSource
TCAP CoachTCAP Coach 55thth grade grade ScienceScience
ObjectiveObjective
The student will recognize the difference The student will recognize the difference between complete and incomplete between complete and incomplete metamorphosis.metamorphosis.
Life Cycles and Life Cycles and MetamorphosisMetamorphosis
You have not always looked like you do You have not always looked like you do today. Your body has gone through today. Your body has gone through many changes in your life. These many changes in your life. These changes are a part of the human life changes are a part of the human life cycle, which includes being a baby, cycle, which includes being a baby, toddler, child, teenager, adult, and an toddler, child, teenager, adult, and an elder.elder.
Life Cycles and Life Cycles and MetamorphosisMetamorphosis
Every living thing has a life cycle.Every living thing has a life cycle. A life cycle is all of the changes an A life cycle is all of the changes an
organism goes through in its life.organism goes through in its life. Members of a species go through similar Members of a species go through similar
life cycles. life cycles. In this lesson, you will learn about In this lesson, you will learn about
different life cycles.different life cycles.
Plant Life CyclePlant Life Cycle
Giant oak trees begin their lives as small Giant oak trees begin their lives as small acorns. acorns.
Plant Life CyclePlant Life Cycle
Other plants begin as Other plants begin as small seeds. The small seeds. The seeds change to seeds change to seedlings and then seedlings and then go through many go through many stages in the plant stages in the plant life cycle.life cycle.
Plant Life CyclePlant Life Cycle
The tree does not start to reproduce until The tree does not start to reproduce until it reaches the last stages of its life cycle. it reaches the last stages of its life cycle. Then it will produce acorns and the life Then it will produce acorns and the life cycle will begin again.cycle will begin again.
Plant Life CyclePlant Life Cycle
Other plants have similar life cycles. The Other plants have similar life cycles. The plants begin as seeds. The seeds plants begin as seeds. The seeds germinate, or begin to grow. Roots germinate, or begin to grow. Roots sprout, then a tiny stem. As the stem sprout, then a tiny stem. As the stem pushes its way through the soil, leaves pushes its way through the soil, leaves begin to grow. The mature flowers begin to grow. The mature flowers produce seeds to start the life cycle all produce seeds to start the life cycle all over again.over again.
Plant Life CyclePlant Life Cycle
MetamorphosisMetamorphosis
Even when the oak tree is small, it still Even when the oak tree is small, it still has a stem and leaves like the adult tree.has a stem and leaves like the adult tree.
Some animals have a different life cycle.Some animals have a different life cycle. These organisms look nothing like adults These organisms look nothing like adults
when they are in the middle stages of when they are in the middle stages of their life cycle. their life cycle.
MetamorphosisMetamorphosis
These organisms, such as frogs, insects, These organisms, such as frogs, insects, and lobsters, go through metamorphosis.and lobsters, go through metamorphosis.
Metamorphosis occurs when an egg Metamorphosis occurs when an egg goes through distinct stages on its goes through distinct stages on its way to become an adult.way to become an adult.
MetamorphosisMetamorphosis
MetamorphosisMetamorphosis
The frog’s life cycle goes from being an The frog’s life cycle goes from being an egg to a tadpole to a frog.egg to a tadpole to a frog.
This life cycle is an example of a This life cycle is an example of a complete metamorphosis.complete metamorphosis.
The metamorphosis is complete because The metamorphosis is complete because the tadpole stage (larva) is different from the tadpole stage (larva) is different from the adult stage.the adult stage.
MetamorphosisMetamorphosis
A tadpole can A tadpole can breathe under water breathe under water and has a tail, while and has a tail, while frogs breathe air and frogs breathe air and have no tails.have no tails.
MetamorphosisMetamorphosis
MetamorphosisMetamorphosis
The life cycle of many insects is also a The life cycle of many insects is also a complete metamorphosis.complete metamorphosis.
Some insects go through their life cycles Some insects go through their life cycles in four stages: egg, caterpillar (larva), in four stages: egg, caterpillar (larva), chrysalis, and butterfly. This is a chrysalis, and butterfly. This is a complete metamorphosis because a complete metamorphosis because a caterpillar is very different from the adult caterpillar is very different from the adult butterfly.butterfly.
MetamorphosisMetamorphosis
MetamorphosisMetamorphosis
Other insects go through incomplete Other insects go through incomplete metamorphosis.metamorphosis.
Incomplete metamorphosis occurs Incomplete metamorphosis occurs when the larvae look similar to the when the larvae look similar to the adults.adults.
These insects have a stage called the These insects have a stage called the nymph stage. A nymph looks like a nymph stage. A nymph looks like a smaller version of the adult.smaller version of the adult.
MetamorphosisMetamorphosis
Grasshoppers and Grasshoppers and lobsters both go lobsters both go through incomplete through incomplete metamorphosis. metamorphosis.
A grasshopper A grasshopper nymph looks like an nymph looks like an adult grasshopper.adult grasshopper.
When an egg goes through When an egg goes through distinct stages on its way to distinct stages on its way to becoming an adult, what becoming an adult, what takes place?takes place?
A. Larval stageA. Larval stage B. MetamorphosisB. Metamorphosis C. ReproductionC. Reproduction D. Nymph stageD. Nymph stage
When an egg goes When an egg goes through distinct stages through distinct stages on its way to becoming on its way to becoming an adult, what takes an adult, what takes place?place?
B. metamorphosisB. metamorphosis
An insect has the following An insect has the following stages in its life cycle:stages in its life cycle:egg – nymph – adultegg – nymph – adultWhich kind of change does Which kind of change does this insect undergo?this insect undergo?
A. Complete metamorphosisA. Complete metamorphosis B. Incomplete metamorphosisB. Incomplete metamorphosis C. Interrupted metamorphosisC. Interrupted metamorphosis D. An incomplete life cycleD. An incomplete life cycle
An insect has the following An insect has the following stages in its life cycle:stages in its life cycle:egg – nymph – adultegg – nymph – adultWhich kind of change does Which kind of change does this insect undergo?this insect undergo?
B. Incomplete metamorphosisB. Incomplete metamorphosis
What do a seed and an What do a seed and an egg have in common?egg have in common?
A. Both are adult stages in life cycles.A. Both are adult stages in life cycles. B. Both are larval stages in life cycles.B. Both are larval stages in life cycles. C. Both are the first stages in life cycles.C. Both are the first stages in life cycles. D. Both are the last stages in life cycles.D. Both are the last stages in life cycles.
What do a seed and an What do a seed and an egg have in common?egg have in common?
C. Both are the first stages in life cycles.C. Both are the first stages in life cycles.