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Chapter 3 Life Cycles

Chapter 3 Life Cycles. Lesson 1 Plant Life Cycles. e mbryo- g erminate- l ife cycle- l ife span-. Lesson 1 Plant Life Cycles. embryo- a plant or animal in the earliest stages of development germinate- to begin growing a new plant life cycle- a series life span-.

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Chapter 3 Life Cycles

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  1. Chapter 3 Life Cycles

  2. Lesson 1 Plant Life Cycles embryo- germinate- life cycle- life span-

  3. Lesson 1 Plant Life Cycles embryo- a plant or animal in the earliest stages of development germinate- to begin growing a new plant life cycle- a series life span-

  4. Life Cycle of a Flowering Plant • 1. Seed is planted • 2. Seed sprouts and grows into a tree • 3. Tree flowers and releases its own seeds • 4. One day the tree will die The life cycle of all living things is • 1. Birth • 2. Development into adult • 3. Reproduction • 4. Death

  5. Parts of a Flower • Petals: attracts birds and bees and other insects • Stamen: Produces pollen which is needed to form seeds • Pistil: Pollen collects here. Seeds are produced in the lower part of the pistil - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Wind, water, or animals move pollen from the stamens to the pistil (seeds produced). The petals attract animals Seeds contain an embryo. Some seeds will land in new places where they germinate Cycle begins again

  6. Life Span of Plants The life span begins when a seed germinates and ends with the death of the plant In similar organisms, the smaller kinds usually have shorter life spans than the larger kinds. *not always true

  7. Lesson 2 ~ Animal Life Cycles Adult- a fully grown, mature, adult Egg- the first stage in the life cycle of most animals Larva- a worm-like form and the second stage of complete metamorphosis Metamorphosis- the process in which an animal changes in different stages of its life cycle Nymph- the second stage of incomplete metamorphosis

  8. Metamorphosis • An egg is the first stage in the life cycle of most animals • All birds, most fish, reptiles, amphibians, and insects lay eggs.

  9. Reptiles • cold-blooded • dry, scaly skin • lay many eggs • breathe through lungs • short legs • vertebrates *Draw a picture of a reptile on your chart*

  10. Amphibians • 2 lives ~ water and land • live in warm wet areas • cold-blooded • bones inside their bodies/ vertebrate • moist skin • no scales, hair, or feathers • Go through metamorphosis grow legs develop lungs *Draw a picture of an amphibian on your chart*

  11. Some insects go through complete metamorphosis and some go through incomplete metamorphosis. Complete Metamorphosis (4 changes) Egg ~ Larva ~ Pupa ~ Adult (looks different in each stage) Incomplete Metamorphosis (3 changes) Egg ~ Nymph ~ Adult

  12. Complete Metamorphosis

  13. Incomplete Metamorphosis

  14. Insects • have 6 legs • made of 3 parts • one or two pairs of wings • cold blooded • invertebrates • lay many eggs *Draw an insect on your chart*

  15. Birds • only animal with feathers • lay eggs • 2 legs and 2 wings • warm blooded • vertebrates *Draw a picture of a bird on your chart*

  16. Fish • scales • most are cold-blooded • lay eggs • fins NOT legs • live in water • breathe through gills • vertebrates *Draw a picture of a fish*

  17. Mammals • have fur or hair • babies drink milk from their mom • vertebrates • 4 limbs • breathe through lungs • warm-blooded *Draw a picture of a mammal*

  18. Life Cycles and Life Spans *Just as life cycles vary, so do life spans* • In general smaller animals have shorter life spans than larger animals of the same kind • There are some exceptions where smaller animals live longer • ex. the human lives longer than an elephant and is much smaller

  19. Lesson 3 ~ Parents and Offspring inherit- to receive traits from a parent trait- a feature or characteristic of a living thing

  20. Look Alikes • Young living things resemble their parents • Features such as color and length of fur are examples of traits • Traits of humans include eye color, hair color, shape of the eyes, nose, and mouth • Traits of birds include feather color and the shape of the beak and feet • Traits of a plant include shape of leaves, the color of its flowers, and type of roots it has

  21. Inherited Traits • Young organisms usually inherit many traits from their parents • Inherited traits are passed from parents to offspring • Some inherited traits may change slightly when they are passed on • Organisms with two parents inherit traits from both parents • Not all organisms resemble their parents at birth. • like a tadpole and frogs • after metamorphosis it begins to look like its parents

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