Lesson 14: Cnidarians

Question 1

cnidarians are…

Answer 1

aquatic animals with simple body structure with a central mouth sorrounded by tentacles

Question 2

cnidarians have 2 main body forms:

Answer 2

• sessile polyp form
• free-swimming medusa form

Question 3

cnidarians reproduce through… explain it

Answer 3

metagenesis

Question 4

cnidarians are “…” animals

Answer 4

nerve-net

Question 5

cnidarians capture prey using… that contain…

Answer 5

cnidocytes, nemocysts

Question 6

have… (2) but lack… (2)

Answer 6

• mouths and tentacles
• brain and true nerve cells

Question 7

cnidarians have the… which are the outercells for protection and sensory

Answer 7

epidermis/ectoderm

Question 8

cnidarians have the… for digestion and nutrient absorption

Answer 8

gastrodermins/endodermis

Question 9

cnidarians have the… for digestion and nutrient transport

Answer 9

gastrovascular cavity

Question 10

cnidarians have… the entrance and exit of food and waste

Answer 10

mouth/oral opening

Question 11

cnidarians have… that contain a stinging cell called…

Answer 11

cnidocytes, nematocysts

Question 12

cnidarians have… a decentralized network of nerve cells throughout the body used for sensory perception

Answer 12

nerve net

Question 13

cnidarians have 2 types of body plans… explain

Answer 13

• polyp:
• medusa:

Question 14

cnidarians can reproduce through… (2) through… (2)

Answer 14

• asexual : polyp form budding
• sexual : medusa form external fertilization

Question 15

cnidarians have the classes (4), explain

Answer 15

• hydrozoa - polyp and medusa
• scyphozoa - medusa
• cubozoa - cube shaped medusa
• anthozoa - polyp

Question 16

cnidarians are important because:

Answer 16

• reef protection
• medicine
• habitat
• climate help
• erosion control