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Principles of Animal Classification
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Principles of Animal Classification
Principles of Animal Classification
Study
1
Question
What is the approximate number of animal species living on Earth today?
Page 1
Answer
About 50 million
2
Question
Into which two main groups are animals classified according to the introductory diagram?
Page 1
Answer
Non-Chordates and Chordates
3
Question
What defines bilateral symmetry in the basis of animal classification?
Page 3
Answer
An animal can be divided into two equal halves forming mirror images by a single vertical plane
4
Question
What defines radial symmetry in animal classification?
Page 3
Answer
An animal can be divided along any plane through a central axis into equal halves
5
Question
How does bilateral symmetry differ from radial symmetry in animals?
Page 3
Answer
Bilateral uses one vertical plane for mirror halves; radial uses any plane through central axis
6
Question
According to body plans, what characterizes asymmetrical animals?
Page 4
Answer
Irregular in shape
7
Question
According to body plans, what characterizes symmetrical animals?
Page 4
Answer
Regular in shape
8
Question
How do asymmetrical body plans relate to animal symmetry?
Page 4
Answer
Asymmetrical animals have irregular shapes without symmetry planes
9
Question
What are germ layers in animal embryonic development?
Page 7
Answer
Different layers of cells in embryonic stages called germ cells
10
Question
Name the three types of germ layers.
Page 7
Answer
Ectoderm, Endoderm, Mesoderm
11
Question
What is the first germ layer listed in the notes?
Page 7
Answer
Ectoderm
12
Question
What is the second germ layer listed in the notes?
Page 7
Answer
Endoderm
13
Question
What is the third germ layer listed in the notes?
Page 7
Answer
Mesoderm
14
Question
What is one basis of classification for Kingdom Animalia mentioned?
Page 3
Answer
Symmetry
15
Question
What example of an asymmetrical animal is shown in the body plans section?
Page 4
Answer
Wool sea sponge
16
Question
Why is symmetry a key basis for classifying animals?
Page 3
Answer
It distinguishes body plans as bilateral, radial, or asymmetrical