Lower Simple Invertebrates

Question 1

porifera

What are the characteristics of porifera

Answer 1

• have pores
  
  • example: sponges
• Ectotherm
• Invertebrate
• Asymmetry
• Acoelomate

Question 2

porifera

how do they eat

Answer 2

• filter feeders
• obtain food and oxygen through holes
• collar cells
• single opening for feeding and excretion
  *

Question 3

porifera

collar cells

Answer 3

filter food particles and microorginsims from the water,then digest them

Question 4

porifera

Respiration circulation excretion

Answer 4

• Respiration circulation excretion by diffusion
• No tissue
• Have no nerves( no nervous system)
• adults can’t move
  * larval stage can move

Question 5

porifera

How can they reproduce

Answer 5

• Can reproduce sexually by releasing eggs and sperm into water hermaphrodies ( produce both male and female gametes but at different time to avoid self-fertilization)
• can also reproduce asexually by budding
• can regenerate body parts

Question 6

Cnidaria

Characteristics

Answer 6

Nettle
Hydra jellyfish Coral Sea anemone
Ectotherm
Invertebrate
mostly radial symmetry
Acoelomate

Question 7

Cnidaria

medusa

forms

Answer 7

Umbrella shape, tentacles, motile free swimming

Question 8

Cnidaria

polyp

forms

Answer 8

Tube with tentacles, around the mouth , can’t move

Question 9

Cnidaria

cnidocytes

Answer 9

Singing cells for feeding and defense that contains nematocysts

Question 10

Cnidaria

nematocysts

Answer 10

tiny barbed spears

Question 11

Cnidaria

forms

Answer 11

single opening for feeding

Question 12

Cnidaria

Respiration circulation excretion

Answer 12

Respiration circulation excretion by diffusion
simple network of nerve cells called a nerve net includes receptor cells

Question 13

Cnidaria

how do they reproduce

Answer 13

• Can reproduce sexually by releasing sperm and eggs into water hermaphrodites
• also reproduce asexually by budding

Question 14

What are examples of Platyhelminthes

Answer 14

planarians tapeworms and flukes

Question 15

What are the characteristics of a Platyhelminthes?

Answer 15

Ectotherm
Invertebrate
bilateral symmetry
Acoelomate
have cephalization

Question 16

What is the nervous cord of a Platyhelminthes?

cephalization :

Answer 16

simple brain structure
nervous system with eye spots for sensing light ganglia and nervous cords

Question 17

Platyhelminthes

planarians are what type of prey Predator relationship?

Answer 17

Predator

Question 18

Platyhelminthes

Parasites are what type of prey Predator relationship?

Answer 18

tapeworm and flukes

Question 19

Platyhelminthes

How many holes does it have?

Answer 19

1
they have single opening for feeding and excretion

Question 20

Platyhelminthes

How do they move?

Answer 20

cilia and muscle cells help them move

Question 21

Platyhelminthes

How do hermaphrodites reproduce?

Answer 21

Sexually

Question 22

How do they reproduce

Answer 22

can reproduce asexually by fission and sexually

Question 23

Nematoda

What are examples of Nematoda

Answer 23

Heartworm, hookworm, roundworm

Question 24

Nematoda

What are the characteristic for Nematoda?

Answer 24

ectotherm
invertebrates
bilateral symmerty
pseudocoelomate
cephalization

Question 25

Nematoda

How does Nematoda use circulation and respiration

Answer 25

• They dont have a circulatory system or respiration system
• rely on diffusion of materials throughout their body
• use diffusion to breathe though gas exchange of carbon dioxide and oxygen

Question 26

How do Nematoda digest?

Answer 26

completed tube for digestive system seperationg opening for feeding and excretion
can be predators, decomposer, and parasite

Question 27

What is Nematoda nervous system?

Answer 27

• have Cephalization
• simple brain structure
• simple nervous system with ganglia and nerve cords

Question 28

How does Nematoda reproduce?

Answer 28

Can reproduction with seperate sexes