S3U3L2-What Are Some Animal Life Cycle?

S3U3L2-What Are Some Animal Life Cycle?

What is a life cycle?

A life cycle is all of the changes that happen to an animal or plant during its life.

Open Ended

What does it mean to say an animal reproduces?

What does it mean to say an animal reproduces?

When an animal reproduces, it makes another animal of the same kind.

Multiple Choice

What is metamorphosis?

• A series of changes that some animals go through.

• A young frog that comes out of an egg and has gills to take in oxygen from the water.

• The stage of complete metamorphosis in which an insect changes from a larva to an adult.

• The stage between egg and pupa in complete metamorphosis in insects.

Multiple Choice

What is a pupa?

• A series of changes that some animals go through.

• A young frog that comes out of an egg and has gills to take in oxygen from the water.

• The stage of complete metamorphosis in which an insect changes from a larva to an adult.

• The stage between egg and pupa in complete metamorphosis in insects.

Multiple Choice

What is a larva?

• A series of changes that some animals go through.

• A young frog that comes out of an egg and has gills to take in oxygen from the water.

• The stage of complete metamorphosis in which an insect changes from a larva to an adult.

• The stage between egg and pupa in complete metamorphosis in insects.

Multiple Choice

What is a tadpole?

• A series of changes that some animals go through.

• A young frog that comes out of an egg and has gills to take in oxygen from the water.

• The stage of complete metamorphosis in which an insect changes from a larva to an adult.

• The stage between egg and pupa in complete metamorphosis in insects.

Open Ended

Describe the life cycle of a person.

Describe the life cycle of a person.

A baby grows up to become a child and then an adult. An adult may have a baby, beginning the cycle again.

Multiple Choice

What’s unusual about the seahorse life cycle?

• the female carries the young inside her body

• the female takes care of the eggs

• The female gives birth

• The males carry the young inside their bodies and give birth.

What’s unusual about the seahorse life cycle?

For most kinds of animals, the female carries young inside her body or takes care of eggs. Seahorses are different, though. The males carry the young inside their bodies and give birth.

The pregnancy of a seahorse lasts two to four weeks. How does that compare to a human pregnancy? 

Human pregnancies last about nine months. 

Open Ended

In your own words, describe a typical animal life cycle.

In your own words, describe a typical animal life cycle.

The life cycle begins with birth. At first, an animal depends on its parent for food. As the young animal grows, it begins to eat on its own and learns skills to help it survive. Eventually, the adult animal reproduces, or has young. 

How do foxes and other animals learn skills they need to survive as adults?

Animals learn many skills by watching their parents. They also practice as they play with other young animals.

Open Ended

How is the life cycle of a seahorse different from the life cycles shown here? How are the life cycles similar?

How is the life cycle of a seahorse different from the life cycles shown here? How are the life cycles similar?

The life cycles are different in that a male seahorse carries developing young inside his body and then gives birth to young seahorses. With the animals shown here, the female animals carry the developing young inside their bodies. The life cycles are similar in that the seahorse and the animals shown here all give birth to young that are smaller versions of their parents.

What is a tadpole?

A tadpole is a young frog that hatches from an egg. It has a tail and no legs and breathes through gills.

What does “metamorphosis” mean?

Metamorphosis takes place when an animal’s body changes form during its life cycle after birth. For example, a frog changes from a tadpole that uses gills to get oxygen to an adult frog that breathes with lungs.

Open Ended

How is the life cycle of alligators similar to the life cycle of frogs?

How is the life cycle of alligators similar to the life cycle of frogs?

Both frogs and alligators lay eggs. Also, adult frogs and alligators have four legs and breathe air. Adult frogs and crocodiles live on land.

Open Ended

How is the life cycle of alligators different from the life cycle of frogs?

How is the life cycle of alligators different from the life cycle of frogs?

Newly hatched alligators look very similar to adult alligators. Newly hatched frogs, called tadpoles, get oxygen with gills. Tadpoles have no legs and live in water. A frog’s body changes a lot more during its life cycle than an alligator’s body.

Multiple Select

Do alligators go through metamorphosis?

• Yes

• No

Do alligators go through metamorphosis?

No. A newly hatched alligator has a similar body shape to an adult crocodile.

Some insects, such as cockroaches, go through a process called incomplete metamorphosis. How is incomplete metamorphosis different from the complete metamorphosis of a butterfly?

In complete metamorphosis, the adult form is very different from the larva stage. For example, the butterfly is very different from the caterpillar. In incomplete metamorphosis, the larva stage looks much more like the adult stage. For example, a newly hatched cockroach is similar to an adult cockroach.

Multiple Select

Do frogs go through complete or incomplete metamorphosis?

• Complete metamorphosis

• incomplete metamorphosis

Do frogs go through complete or incomplete metamorphosis?

A frog goes through several stages—egg, tadpole, tadpole with legs, and adult—during its life cycle. A newly hatched tadpole is completely different from an adult frog. Therefore, a frog goes through complete metamorphosis.

Open Ended

Why are young animals different from their parents?

Why are young animals different from their parents?

A young animal gets some of its looks from each of its parents. Because of this, it will not look or act exactly like either parent.

What other living things go through such big changes in body form?

Moths also go through metamorphosis. A newly hatched moth is a caterpillar. The caterpillar forms a pupa and changes into a moth.

Open Ended

How is the life cycle of a frog different from the life cycle of a person or other animals?

How is the life cycle of a frog different from the life cycle of a person or other animals?

Some animals, including people, do not go through metamorphosis. The young animal looks like a smaller version of the adult, and they have no larva stage.

How is the life cycle of a bird different from the life cycle of a frog?

An adult bird lays an egg, usually in a nest. A chick hatches from the egg. As the chick grows, its features change and its wings get longer and stronger. However, a young chick looks very similar to an adult bird. On the other hand, a frog hatches from an egg as a tadpole. A tadpole is very different from an adult frog. A tadpole uses gills to breathe and does not have any legs. An adult fish uses lungs to breathe and has four legs.

Open Ended

Compare and contrast the egg of a fish or frog with the egg of a bird.

Compare and contrast the egg of a fish or frog with the egg of a bird.

A bird egg has a hard shell. Birds lay their eggs in nests or on the ground. A fish or frog egg does not have a hard shell. Fish and frogs lay their eggs under water. All eggs protect the young animal inside and give it food.

Multiple Select

Does a butterfly go through complete metamorphosis or incomplete metamorphosis?

• complete metamorphosis

• incomplete metamorphosis

Complete metamorphosis

A butterfly goes through complete metamorphosis. The body of a newly hatched caterpillar is completely different from the body of an adult butterfly.

A house fly goes through complete metamorphosis. Describe the life cycle of a house fly.

A house fly goes through four stages during its life: egg, larva, pupa, and adult. Each stage looks very different. Fly larvae, or maggots, hatch from eggs. In pupa stage, the fly develops within a hard shell. The adult fly emerges from the shell. Only the adult is able to fly.

What is a life cycle?

A life cycle includes all of the changes that happen to a plant or animal from the time its life begins until it reproduces. The young organism grows and changes into an adult. Some young organisms are small versions of the adult. In other plants and animals, the young organism is very different from the adult.

Multiple Select

Name one kind of insect that goes through incomplete metamorphosis.

• butterfly

• cockroach

• frog

Multiple Select

Name two kinds of animals that go through complete metamorphosis.

• butterfly

• cockroach

• frog