4/21 & 4/22 - 7th Grade Agenda

Collect HW: Reading & Notetaking 195 – 196Cnidarians & WormsClasswork: Making Scientific NamesPassback HWVideo: Life (Deep Ocean)Textbook Reading 415 – 421HW: Reading & Notetaking 197 – 200

Reflection

• Prompt: Write 3 facts that you know about Jelly Fish and Coral Reef.

Sea anemone and many circular animals exhibit R______

S_______adial

ymmetry

• What are some characteristics of Radial Symmetry Animals?

• Do not have distinct front or back ends

• Lives in the ocean• Senses their

environment in all directions

The balanced arrangement of a butterfly’s body is called

B_______ S________ymmetryilateral

• What are some characteristics of Bilateral Symmetry Animals?

• Larger & More complex than radial symmetry animals

• Moves more quickly• Sense organ in the front

Is a Sponge an animal or a plant?

• Sponge is an animal• Although it cannot

move around from place to place sponge take food into their bodies

What do sponges eat?

• Tiny organisms such as bacteria and protists

• Sponge gets its oxygen from water

• Network of spikes support the sponge

Sponge Larva

• Sponge reproduce asexually and sexually

• Sponges do not have separate sexes

• At any one time of the year, some sponges are producing eggs and others are producing sperms

What are Cnidarians?

Jellyfish Facts• They are not used to make Jelly• 98% Water• No Heart or Blood• Most don’t have a brain (except

Box Jellyfish)• Most only detect light. Some have

24 eyes (Box Jellyfish)• When stung, Vinegar (not urine) is

the best treatment• Irukandji Jellyfish (size of fingernail)

can kill you with a single sting.

More on Cnidarians

• Unlike sponges, cnidarians have specialized tissues

• Muscle like tissues for swimming

• Anemones stretch out

How does cnidarians obtain and digest food?

• Cnidarians captures its prey by using its stinging cells to inject venom

• Then the cnidarian’s tentacles pull the prey animal to its mouth

• From there the food passes into a body cavity where it is digested.

How are coral reefs made?• Built by cnidarians1. Free swimming coral

larva attaches to a solid surface ( broken shell, sunken ship)

2. The coral polyp produces a hard, stony skeleton around its soft polyp body

3. Over thousands of years, as live corals add their skeletons, the reef grows

What are the major type of worms

• Flatworms• Roundworms• Segmented Worms

Lifecycle of a tapeworm

An organism that lives inside or on another organism and takes its food from that organism is a

P_______arasite

Do worms have brains?

• Yes• They also have a heart, digestive tract and

reproductive organs

Is an earthworm helpful?

• Yes.• Earthworm dropping

make the soil fertile. Earthworm tunnels loosen the soil and allow air, water, and plant roots through it

How do Earthworms Mate?

• Earthworms are hermaphroditic meaning each worm has organs of both sexes.

• One worm has to find another worm in order to mate