LIFE CYCLES

CHAPTER ONE
How Do Plants Grow and Change?


Vocabulary Words

Observe-to use your senses to learn about, to look closely, smell, taste, hear, or feel

Compare-to tell how object or events are alike and different

Model-to make something to show how something in real life works

Life Cycle-the way a living thing grows, changes, makes more living things like itself, and dies

Germinate-when seeds begin to grow

Seedling-a young plant

1. The world is filled with living things.

2. Plants, animals, and humans are living things.

3. All living things grow and change. All living things eventually die

4. All plants have a life cycle. During it's life cycle, a plant can grow, change, and make more plants like itself. The plant dies at the end of it's life cycle.

5. Not all plants start their life cycles in the same way. Some plants, such as trees, start as seeds. Other plants start their life cycles as bulbs or cuttings. Others start their life cycles as spore. Spores can be found on many kinds of leaves.

7. A young plant can have the same shape and color as it's parent. As it grows, a young tree produces leaves and other parts that look like the parts of the parent tree.

9. Flowering plants, such as a pumpkin, grow flowers that make seeds and fruit. The seeds for the new pumpkin can be found inside the pumpkin.

10. Flowering plants have their seeds in the fruit.

11. Young plants look like their parents because they usually have the same shape.



Our class project was to plant bean seeds. We'll watch as the seed grows and changes into an adult bean plant. We will observe how the seed is different from the adult bean plant.

*The bean seed has a seed coat, tiny plant, and stored food.
*The bean plant has roots, a stem, leaves, flowers, and seeds found inside the bean.

Chapter Two

How Do Humans and Animals Grow and Change?

Vocabulary Words

Fish-a fish has a backbone, lives in water, and has gills, most hatch from eggs

Reptile-a reptile has a backbone, scaly skin, and breathes with lungs

Mammal-a mammal has a backbone, usually has hair or fur, and it's young are born alive

Bird-a bird has feathers, two legs, two wings, and lays eggs

Amphibian-an amphibian has a backbone and lives part of it's life in water and part on land

Insect-an insect has three body parts, six legs, and hatches from an egg

1. Humans and animals grow and change during their life cycles. They are born or hatched. They can make more humans and animals like themselves. They also eventually die.

2. Humans have some things in common. All humans have parts that are the same-brain, muscles, heart, bones, lungs, stomach. Your brain sends messages to the rest of your body. Your muscles and bones work together to help you move. Your heart is a muscle that pumps blood to all parts of your body. Your lungs help you to breathe and your stomach begins digestion of food.

3. Animals begin their life cycles in different ways. Fish live in water and most hatch from eggs.

4. Most reptiles hatch from eggs, too. A snake is a reptile. Snakes have scaly skin and use lungs to breathe.

5. A dog uses it's lungs to breathe, too. A dog is a mammal. Most mammals give birth to live young.

6. A chicken is a bird. A bird has two legs, wings, and feathers.

7. A frog is an amphibian. An amphibian lives part of it's life on land and part of it's life in water.

8. A frog life cycle
*An adult frog lays eggs, a tadpole hatches from an egg, a tadpole has a tail and lives in the water, a froglet or young frog develops, it has a tail too but it also has legs and lives mostly on land, the froglet becomes an adult frog with four legs and no tail and lays eggs to repeat this life cycle.

9. A butterfly is an insect. An insect has three body parts and six legs. Some insects have life cycles with three stages. A butterfly has a four-stage life cycle.

10. Our class project was to study a butterfly life cycle. We began with a caterpillar or larva. (We missed seeing the beginning step of the laying of an egg.) At the end of our project we released our butterflies in Kendall's Korner!
*An adult butterfly lays and egg, the egg is ready to hatch in about one week into a caterpillar, or larva, the caterpillar can move, eat, and grow, a caterpillar becomes a pupa and forms a chrysalis, or covering, it doesn't move or eat, after about 14 days a butterfly comes out of the chrysalis.

11.Think about this!
How are a young fish and a young dog alike?

Answer:
The are the same because they both are living, and they both will grow.

How are their lives different?

Answer:
They are different because fish live in water and hatch from eggs. Dogs use their lungs to breathe and are born alive.

Chapter Three

How Did Some Plants and Animals Become Extinct?

Vocabulary Words

Extinct-when no members of it's group are alive

1. Many kinds of plants and animals that once lived on Earth have died out, or become extinct.

2. Plants and animals become extinct when there are no longer any adult plants or animals to make more living things like themselves.

3. Some plants and animals alive today do look like plants and animals from long ago.

4. Dinosaurs died out millions of years ago. No one knows exactly why. Possibly the Earth got too cold or a meteor hit the Earth.

5. Plants and animals die out, or become extinct, for different reasons. Sometimes plants and animals become extinct when climates change or when the area they live in is destroyed or changed.

6. Some toads are extinct. Other toads are alive today. Those alive today found what they needed to survive, and others did not.

7. We know about the dinosaurs because scientists have studied the fossil bones they found.

8. Only living animals can make more of themselves.


UNIT CONCLUSION:

All plants have life cycles. Some plants begin their life cycles as seeds. They grow and change during the stages of their life cycles.

Humans and animals have life cycles, too. They are born live or hatch from an egg. They grow and change during the different stages of their life cycles.

Some plants and animals have become extinct, or died out, when the area they lived in was destroyed or changed. They could no longer find what they needed to survive.

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