kingdom Animalia

Question 1

kingdom Animalia is divided into 2 major groups

Answer 1

an animal is a multicellular, eukaryotic heterotroph whose cells lack a cell wall. a) invertebrates, b) vertebrates

Question 2

invertebrates

Answer 2

animals without a spine: 97% of all animals

Question 3

vertebrates

Answer 3

animals with a backbone: 3% of all animals

Question 4

general characteristics of an animal

Answer 4

1. heterotrophic and usually obtain food through ingestion followed by digestion
2. typically can move by way of muscle fibres
3. multicellular, with specialized cells
4. typically a diploid adult stage in life cycle
5. usually has sexual reproduction and produces an embryo that undergoes developmental stages

Question 5

evolution of animals

Answer 5

more than 30 phyla are believed to have evolved from a Protistan ancestor. difficult to trace because many animals are soft-bodied and do not leave fossils

Question 6

taxonomists use 4 criteria to classify animals

Answer 6

level of organization, body plan, type of symmetry, and type of coelom

Question 7

level of organization

Answer 7

cell, tissue- a group of similar cells

organ- different types of issue grouped together

Question 8

body plan

Answer 8

the sac plan

the tube-within-a tube plan

Question 9

type of symmetry

Answer 9

bilateral, radical symmetry, asymmetrical, spherical

Question 10

type of coelom

Answer 10

a coelom is a body cavity, acoelomate, psendocoelom, true coelom

Question 11

bilateral

Answer 11

definite right and left halves

Question 12

radical symmetry

Answer 12

symmetry around a central axis

Question 13

asymmetrical

Answer 13

no particular symmetry

Question 14

spherical

Answer 14

two identical halves no matter how the animal is divided longitudinally

Question 15

type of coelom- mesodermal tissue

Answer 15

forms mesentery which holds internal organs in place

Question 16

type of coelom- psendocoelom

Answer 16

a body cavity incompletely lined with mesodermal tissue

Question 17

type of coelom- true coelom

Answer 17

body cavity lined with mesodermal tissue

Question 18

type of coelom- acoelomate

Answer 18

no cavity interior mesodermal tissue

Question 19

body organization

Answer 19

cell, tissue, organ, organ system

Question 20

symmetry

Answer 20

asymmetrical, radial symmetry, bilateral symmetry.

Question 21

early development

Answer 21

life begins as zygote, blastula stage- embryo forms as a hollow ball of cells with a single opening the blastopore, blaster pore elongated tube to become digestive

Question 22

mouth first

Answer 22

protostome

Question 23

anus first

Answer 23

deuterostome

Question 24

ectoderm

Answer 24

outer

Question 25

endoderm

Answer 25

inner

Question 26

mesoderm

Answer 26

middle