Module 13 Part 1

Question 1

Animals that lack a backbone

Answer 1

Invertebrates

Question 2

Animals that possess a backbone

Answer 2

Vertebrates

Question 3

An organism posesses spherical symmetry if it can be cut into two identical halves by any cut in the center

Answer 3

Spherical symmetry

Question 4

An organism possesses this if it can be cut into two identical halves by any longitudinal cut through its center

Answer 4

Radial cymmetry

Question 5

An organism possesses this if it can only be cut into two identical halves by a single longitudinal cut along its center that divides it into right and left halves

Answer 5

Bilateral cymmetry

Question 6

The end of an animal that contains its head

Answer 6

Anterior end

Question 7

The end of the animal that contains its tail

Answer 7

Posterior end

Question 8

The sessile, tubular form of a cnidarian with a mouth and tentacles at one end and a basal disk at the other

Answer 8

Polyp

Question 9

A free-swimming cnidarian with a bell-shaped body and tentacles

Answer 9

Medusa

Question 10

Animal tissue consisting of one or more layers of cells that have only one free surface, because the other surface adheres to a membrane or other substance

Answer 10

Epithelium

Question 11

The jellylike substance that separates the epithelial cells in a cnidarian

Answer 11

Mesoglea

Question 12

Small capsules that contain a toxin that is injected into prey or predators

Answer 12

Nematocysts

Question 13

What stage do hydras exist in?

Answer 13

The polyp stage

Question 14

How do hydras reproduce?

Answer 14

They produce sexually and asexually. The asexual method is called budding. For sexual reproduction, eggs are formed in the hydra and eventually the eggs and sperm are released in the water where they are fertilized.