Life Cycles

• 5th grade

• This unit will focus on cycles. The focus will primarily be on the life cycles of plants and animals.

Engage

• Brainpop

• United Streaming Video

Plant Life Cycle

Seed

SeedlingSapling

Adult

Different forms of seeds. Germination occurs when a new plant sprouts from a seed.

Plants produce during maturity

• Fertilization occurs when both male and female sex cells join together in the pollen.

• Plants have different adaptations that allow them to fertilize and reproduce.

• Example:– Plants with flowers produce their pollen inside the flower. – Plants produce nectar inside the flower to attract bees. – Bees get nectar from different flowers.– The pollen sticks to the bees and is transferred to a different

flower.– Fertilization then takes place.

Plant Life Cycles

• Please draw the following cycles in your journal.

Plant Life Cycle

Avian Life Cycles

• Bird eggs have a hard shell. When the bird grows enough, it breaks out of the egg. This process is called hatching. The bird is called a chick. The chick quickly grows into an adult. The adult female can then lay eggs to continue the life cycle.

Reptile Life Cycle

• A turtle is a reptile and, like most other reptiles, it lays eggs. Turtle eggs have soft shells that feel leathery. When the baby turtle has grown enough, breaks out of the shell. This process is called hatching. Newly hatched turtles look very much like adult turtles. The young turtles quickly grow into adults. The adult female lays eggs and the cycle continues

Fish Life Cycle

• A female fish lays eggs which grow in clusters outside the mother's body. The parents usually do not protect the soft-covered eggs. Instead, many eggs are produced so enough young fish survive to continue their species. When the eggs hatch, the baby fish look very much like the adult fish. With time, they grow into adults. The adult female can lay eggs to continue the life cycle

Animal/Mammal Lifecycle

• Most mammals do not hatch from eggs; they have live births. The animal grows in a special way in the adult female's body. Mammals are born alive. When the young are born, the mother produces milk to feed them. The babies need a lot of care. The young mammal then grows to be an adult. Mammals are born looking very much like the adult mammals. The female mammal then goes on to have babies and the life cycle continues.

Incomplete Metamorphasis

• A praying mantis goes through three stages in its life cycle. These stages are known as egg, nymph, and adult. This is a process called incomplete metamorphosis. The adult mantis can lay between 10 – 400 eggs at one time. These eggs are inside a capsule that hardens for the protection of the eggs. When the egg hatches, the young mantis looks similar to its parents, but without wings. This stage is known as the nymph stage. As time goes by, the nymph changes its outer body. It is able to do this because its outer body is a flexible exoskeleton. The change in outer body is known as molting. Molting may occur from five to ten times. When the final molt occurs, the mantis will have wings and will go into the adult stage. The adult will then be ready to reproduce and continue its life cycle.

Butterfly Lifecycle• The butterfly is an insect that goes through complete

metamorphosis. Metamorphosis is a change in body form during growth and development of an animal. The stages that the butterfly goes through are egg, larva, pupa, and adult. When the butterfly egg hatches, a caterpillar comes out. This caterpillar is also known as a larva. The caterpillar eats leaves from plants as a food source. The larva then goes into the next stage, which is the pupa stage. During this stage, the caterpillar is changing its body inside a cocoon. When the change is complete, the butterfly emerges from the cocoon. The butterfly is now in the adult stage.

• Many insects such as mosquitoes, moths, beetles, and flies have life cycles that go through stages similar to the butterfly. This life cycle is called complete metamorphosis.

Complete Metamorphasis

• Frogs go through a complete change during their life cycle. This life cycle is called complete metamorphosis. Metamorphosis is a change in body form during growth and development of an animal. The adult frog lays its eggs in water. Frog eggs have a jellylike covering and look like a mass of jelly in the water. When the eggs hatch tadpoles emerge looking like small fish. Tadpoles have tails like fish and breathe in the water through gills. Eventually, back and front legs form on the tadpole. The tail disappears and lungs form in the young frog. The young frog can no longer breathe in water. It must breathe the air we breathe as humans. The frog is now an adult. The adult female can lay eggs and the life cycle continues.