Science Chapter 2 Lesson 1-2 Quiz Study

Question 1

What is symmetry, bilateral symmetry, radial symmetry, and asymmetry?

Answer 1

Symmetry describes the balanced distribution of an animal’s parts around an axis. Bilateral symmetry is the body parts are arranged in the same way on their left and right sides. Radial symmetry is when the body parts of an animal are arranged in a circle around a center point. Asymmetry is when there is no symmetry at all.

Question 2

What is a sponge?

Answer 2

A sponge is an invertebrate with a central cavity, many small pores, and a large opening on top.

Question 3

What is a spongin?

Answer 3

The flexible substance that makes up the body of a sponge.

Question 4

What does regeneration mean?

Answer 4

Regeneration is the process of growing new body parts.

Question 5

What is a cnidarian?

Answer 5

Cnidarians are the group of invertebrate that includes sea anemones, sea jellies, corals, hydras, and the Portuguese man-of-war.

Question 6

What is an annelid?

Answer 6

An annelid is the common segmented worm.

Question 7

What is the difference between a vertebrate and an invertebrate?

Answer 7

A vertebrate has a backbone while an invertebrate has no backbone.

Question 8

What are the 4 skeletal structures in invertebrates?

Answer 8

The 4 are:
1. A skeleton made of calcium, silica, and organic fibers.
2. A skeleton of calcium carbonate plates and spines.
3. A skeleton made of chitin.
4. Lastly, a skeleton made of a calcium carbonate shell.

Question 9

What are the 5 different types of invertebrate phyla?

Answer 9

The 5 are: sponges, cnidarians, flatworms, roundworms, and segmented worms.

Question 10

What is a sponge’s role in the ecosystem?

Answer 10

A sponge’s role in the ecosystem is to support the nitrogen cycle in coral reefs.

Question 11

What is a cnidarian’s role in the ecosystem?

Answer 11

A cnidarian’s role in the ecosystem is to add diversity in the ocean and to maintain its health.

Question 12

What is a flatworm’s role in the ecosystem?

Answer 12

A flatworm’s role in the ecosystem is to maintain the population of other animals by eating them.

Question 13

What is a roundworm’s role in the ecosystem?

Answer 13

A roundworm’s role in the ecosystem is to help support the nitrogen cycle, to feed on insects that damage crops, and to add nutrients to the soil.

Question 14

What is a segmented worm’s role in the ecosystem?

Answer 14

A segmented worm’s role in the ecosystem is to help decompose organic matter.

Question 15

Define the phylum Porifera(sponges).

Answer 15

Sponges(Porifera) are the most simplistic animals. They have the most simplistic digestive and nervous systems.

Question 16

What is a coelom?

Answer 16

A coelom is a fluid-filled space that supports internal organs.

Question 17

What are the 5 key characteristics of an animal?

Answer 17

1. Animals are multicellular, heterotrophic organisms.
2. Animals typically reproduce sexually.
3. Animal cells do not have cell walls.
4. Animals have an internal digestive system.
5. Animals have the ability to move.

Question 18

Define the phylum Echinodermata.

Answer 18

The phylum Echinodermata includes starfish, sand dollars, and sea cucumbers. These all have radial symmetry with 5 parts but the kids have bilateral symmetry.

Question 19

Define the phylum Cnidaria.

Answer 19

The phylum Cnidaria includes sea anemones and jellyfish. The main characteristics are: aquatic organisms, they have nematocytes-tentacles that capture food, two body layers, and radial symmetry.

Question 20

Define the phylum Annelida.