Lab 3 - Cnidarians (Hydra)

Question 1

Defense and prey capture

Answer 1

Tentacles

Question 2

Ingestion of food and elimination of indigestible particles (egestion)

Answer 2

Mouth

Question 3

Elevated mound of tissue that expands or contracts to regulate size of mouth opening

Answer 3

Hypostome

Question 4

Specialized stinging cells located in the epidermal layer of the tentacles and body wall

Answer 4

Cnidocytes

Question 5

Chamber within which extracellular digestion of prey occurs; only opening is through the mouth

Answer 5

Gastrovascular Cavity

Question 6

Product of asexual reproduction; will fall off when mature and become a self-sufficient organism

Answer 6

Bud

Question 7

Organs for sexual reproduction; Hydra are dioecious, meaning that an organism has either testes or ovaries (male or female), but not both

Answer 7

Gonads (testes & ovaries)

Question 8

Specialized region for attachment to the substrate

Answer 8

Basal Disc

Question 9

Outer tissue layer; specialized for protection

Answer 9

Epidermis

Question 10

Inner tissue layer; specialized for digestion

Answer 10

Gastrodermis

Question 11

Inert, acellular, jellylike substance that aids in supporting the body

Answer 11

Mesoglea

Question 12

Stinging capsule

Answer 12

Nematocyst