/
Animal Biology and Invertebrate Diversity
Save to my account
Sign up
Animal Biology and Invertebrate Diversity
Animal Biology and Invertebrate Diversity
Study
1
Question
What are the three defining characteristics of an animal?
Answer
Eukaryote, heterotroph, multicellular organism.
2
Question
How do animal cells typically organize into higher structures?
Answer
Cells form tissues, tissues form organs, organs form systems.
3
Question
What are the four primary functions of animals?
Answer
Obtain food and oxygen, maintain internal stability, move, reproduce.
4
Question
What types of reproduction do animals exhibit?
Answer
Sexual and asexual; sexual includes fertilization.
5
Question
What are the three main symmetry patterns in animals?
Answer
Bilateral symmetry, radial symmetry, asymmetry.
6
Question
What defines bilateral symmetry in animals?
Answer
One plane divides body into mirror-image halves.
7
Question
What characteristics are associated with bilateral symmetry?
Answer
More complex, anterior end with sense organs, faster movement.
8
Question
What defines radial symmetry in animals?
Answer
Multiple planes through a central point divide the body.
9
Question
What habitats and behaviors characterize radially symmetric animals?
Answer
Aquatic, no distinct front or back, slow movement.
10
Question
How does bilateral symmetry differ from radial symmetry?
Answer
Bilateral: one plane, complex, fast, anterior senses. Radial: many planes, aquatic, slow, no front/back.
11
Question
What is an invertebrate?
Answer
Animal lacking a vertebral column or backbone.
12
Question
What percentage of animal species are invertebrates?
Answer
About 95 percent of species; over 90 percent of living species.
13
Question
Name the eight major invertebrate phyla.
Answer
Porifera, Cnidaria, Platyhelminthes, Nematoda, Annelida, Echinodermata, Mollusca, Arthropoda.
14
Question
What defines phylum Porifera?
Answer
Primitive multicellular aquatic animals, attached to surfaces.
15
Question
What are key features of adult sponges?
Answer
Lack definite nervous system and musculature; no conspicuous movement.
16
Question
How many sponge species exist and their marine percentage?
Answer
About 5,000 described; 98 percent marine.
17
Question
Why are sponges significant in animal classification?
Answer
Primitive multicellular animals without nervous system or movement.
18
Question
What environments do sponges inhabit?
Answer
Attached in seas from shallow to extreme depths.
19
Question
Define homeostasis in animal function.
Answer
Maintaining stable internal conditions.
20
Question
Why do bilateral animals often have anterior sense organs?
Answer
Associated with front end for faster, directed movement.
21
Question
What examples illustrate invertebrate diversity?
Answer
Sea stars, sea urchins, earthworms, sponges.
22
Question
How do invertebrates compare to total animal species?
Answer
Enormous group; 95% of species, over 90% living.
23
Question
What global distribution do invertebrates have?
Answer
Found worldwide.
24
Question
Define asymmetry in animal body plans.
Answer
No balanced arrangement of parts.
25
Question
What role does symmetry play in describing animals?
Answer
Simplifies body plan organization and lifestyle inferences.
26
Question
What is the simplest level definition of an animal?
Answer
Eukaryote, heterotroph, multicellular.
27
Question
How does radial symmetry relate to animal lifestyle?
Answer
Aquatic habitats, slow or no movement, no front/back.