Simple Animals

Question 1

Why are sponges and cnidarians animals?

Answer 1

1) multicellular
2) heterotrophic
3) have no cell wall
4) motile at some point

Question 2

Difference between adult and larval sponges

Answer 2

Larval are more motile

Question 3

Why are sponges so simple

Answer 3

Because they have no tissues or organs

Question 4

The anatomy of a sponge

Answer 4

Made of two types of cells (amoebocytes that perform digestion and collar cells that move water through the organism) and spicules

Question 5

How do sponges get food

Answer 5

The filter the water plankton or organic material

Question 6

what is one advantage to having no true tissues or only a few specialized cells

Answer 6

Easy to regenerate

Question 7

How can you classify phylum Cnidaria

Answer 7

1) Incomplete digestion
2) soft body
3) tentacles with stinging cells
4) no central nervous system

Question 8

What is a nematocyst (cnidocyte) and what do cnidarians use them for

Answer 8

It’s a stinging cell to immobilize prey

Question 9

What type of symmetry do cnidarians have

Answer 9

Radial

Question 10

What are the two body types for cnidarians

Answer 10

Medusa an polyp

Question 11

Characteristics of class Anthozoa and an example

Answer 11

1) Polyp entire lives
2) upward facing mouth
3) sessile

Coral, anemones

Question 12

Characteristics of class syphozoa and an example

Answer 12

1) Medusa as adults
2) downward facing mouth
3) motile as adults

Jellyfish

Question 13

Characteristics of class Cubozoa and an example

Answer 13

1) Medusa
2) downward facing mouth
3) box shaped
4) motile

Box jellyfish

Question 14

Characteristics of class Hydrozoa and an example

Answer 14

1) Mostly polyps
2) upward facing mouth
3) microscopic
4) can live solo or in colonies

Hydroids

Question 15

How can you tell the difference between the three types of simple worms

Answer 15

Flatworms have a wide, smooth, flattened shaped with incomplete digestion

Ribbon worms have a narrow, long, flattened shape with complete dig

Round worms have a short, round shape, with complete dig

Question 16

All Mollusks have these characteristics

Answer 16

1) have a mantle
2) digestive tract has two openings
3) share similar developmental patterns
4) have a coelom (body cavity)

Question 17

Some Mollusks have these characteristics

Answer 17

1) Hard external shell
2) bilaterally symmetrical
3) live on land
4) inhibit aquatic environments
5) are slow moving

Question 18

Describe the head-foot region of a cephalopod

Answer 18

The muscular foot is divided into tentacle and they surround the mouth. The eyes are behind the tentacles

Question 19

How does the intelligence of an octopus compared to that of a clam

Answer 19

Octopus can problem solve and change their appearance blend in with different environments

Question 20

Characteristic of Gastropods

Answer 20

1) external shell
2) use radula in feeding
3) use a large foot to move

Question 21

Characteristics of bivalves

Answer 21

1) have no distinct head
2) external shell
3 use gills for respiration and food collection
4) use a large foot to move
5) filter the water for plankton in order to feed

Question 22

Characteristics of Cephalopods

Answer 22

1) intelligent, well developed nervous system
2) use mantle to move around
3) external shell
4) carnivores
5) use radula in feeding
6) bite prey with beak

Question 23

Why did early scientists classify corals and sponges as plants

Answer 23

They don’t appear to move