Worms, Cnidarians, and Sponges

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Worms, Cnidarians,and Sponges

• Review Sheet Answers

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Sponges 1

• What is an invertebrate?
• Invertebrates are animals that do not have
  backbones.

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Sponges 2

• What does asymmetrical mean?
• It has no symmetry.

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Sponges 3

• Define sessile.
• An organism spends its life attached to one spot
  and does not move from place to place.

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Sponges 4

• What are pores? How do they help sponges?
• Small openings that surround the entire body of a
  sponge. They allow water and oxygen to enter the
  sponges body.

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Sponges 5

• How do sponges obtain food and oxygen?
• Water travels through the pores and it carries
  food and contains oxygen molecules. The
  specialized cells filter them out.

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Sponges 6

• Do sponges have tissues, cells, or organs?
• CELLS!!

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Sponges 7

• What are spikes? How do they help sponges?
• They form a rigid frame that helps support the
  sponges body. They also are a defense
  mechanism.

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Sponges 8

• Describe the two types of reproduction.
• Asexually Budding. Buds form on the parent
  sponge and eventually break off and float away.
• Sexually Fertilization. Sperm are released by
  a male sponge and then fertilize a females eggs.

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Sponges 9

• What is a larva?
• A fertilized egg becomes a larva. It is the
  immature form of the adult and looks very
  different.

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Cnidarians 10

• What is radial symmetry?
• Many lines of symmetry, all through a center
  point.

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Cnidarians 11

• How are cnidarians tentacles unique?
• They have stinging cells.

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Cnidarians 12

• What is a nematocyst?
• A capsule in the stinging cell that holds a
  barbed filament.

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Cnidarians 13

• Cnidarians are more advanced than sponges because
  they have.
• TISSUES!

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Cnidarians 14

• Describe the two types of reproduction of
  cnidarians.
• Asexual Budding (buds form on the adult, break
  off, float away, and then attach to the ocean
  floor).
• Sexual Sperm are carried to the egg where
  fertilization occurs.

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Cnidarians 15

• What is a polyp?
• Vase-like shape.
• Mouth is on the top.
• Sessile
• What is a medusa?
• Free swimming animal.
• Mouth is on the bottom.
• Looks like an upside down bowl.

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Worms 1

• What are the 3 types of worms?
• Flatworms they are FLAT
• Roundworms they are ROUND
• Segmented worms they have SEGMENTS

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Worms 2

• What is bilateral symmetry?
• Only one line of symmetry in the animal.

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Worms 3

• What is regeneration?
• The ability to regrow body parts.

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Worms 4

• What is a parasite?
• Organism that lives on or in another organism.

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Worms 5

• What is an eyespot?
• Allow the organism to see light versus dark.
• Planaria have them.

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Worms 6

• What are odor cells?
• Allows the organism to smell food.
• Planaria have them.

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Worms 7

• How do planaria eat?
• They insert feeding tubes into the food.
• Next, digestive juices start to digest the food
  outside the worm.
• Finally, the feeding tubes bring the prey into
  the worm.

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Worms 8

• Where do most roundworms live?
• Moist environments

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Worms 9

• What type of digestive tract do roundworms have?
• Open at both ends or one way.

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Worms 10

• What are segments?
• Tiny linked sections that cover the worms body.

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Worms 11

• Describe the digestive tract of segmented worms.
• Open _at_ both ends One Way.

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Worms 12

• Describe a closed circulatory system. What is it
  and why do some animals have it?
• Blood moves through a connected network of blood
  vessels.
• It is important because it allows animals to grow
  larger.

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Worms 13

• What does it mean that earthworms are scavengers?
• They eat decayed plant and animal remains in
  soil.

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Worms 14

• Why do earthworms need moisture?
• They get oxygen from the water thats on their
  skin.
• No moisture no oxygen.

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Worms 15

• How do earthworms help gardeners and farmers?
• Tunnels loosen soil and provide room for air,
  water, and roots, which promote plant growth.