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. *Draw a picture of a reptile on your chart*
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. *Draw a picture of an amphibian on your chart*
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. *Draw an insect on your chart*
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. *Draw a picture of a bird on your chart*
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. *Draw a picture of a 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. *Draw a picture of a mammal*
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