Check.24 Introduction To Animals

Front 1

Invertebrates

Back 1

Animals without backbone.

Front 2

Exoskeleton

Back 2

Hard or tough outer coverings that provide a framework of support.

Front 3

Endoskeleton

Back 3

Internal skeleton.

Front 4

Vertebrates

Back 4

Animals with endoskeleton and backbone.

Front 5

Hermaphrodites

Back 5

Which produce both eggs and sperms in the same animal body.

Front 6

Zygote

Back 6

When the sperms penetrates the egg to form a fertilized egg cell.

Front 7

Internal fertilization

Back 7

When the sperm and egg combine inside the animal's body.

Front 8

External fertilization

Back 8

When egg and sperm combine outside the animal's body.

Front 9

Budding

Back 9

An offspring develops as a growth on the body of the parent.

Front 10

Fragmentation

Back 10

The parent breaks into pieces and each piece can develop into an adult animal.

Front 11

Regeneration

Back 11

A new organism can regenerate or regrow from the lost body part if the part contains enough genetic information.

Front 12

Parthenogenesis

Back 12

A female animal produces eggs that that develop without being fertilized.

Front 13

Blastula

Back 13

Fluid-filled ball of cells.

Front 14

Gastrula

Back 14

A two-cell-layer sac with an opening at one end.

Front 15

Endoderm

Back 15

The inner layer of cells in the gastrula.

Front 16

Ectoderm

Back 16

The outer layer of cells in the gastrula.

Front 17

Mesoderm

Back 17

The layer of cells between the Endoderm and Ectoderm.

Front 18

Symmetry

Back 18

Describes the similarity or balance among body structures of organisms.

Front 19

Asymmetry

Back 19

It is irregular in shape and has no symmetry or balance in its body structures.

Front 20

Radial symmetry

Back 20

Can be divided along any plane,through a central axis,into roughly equal halves.

Front 21

Bilateral symmetry

Back 21

Can be divided into mirror image halves only along one plane through the central axis.

Front 22

Anterior

Back 22

Head end, found in animals with bilateral symmetry.

Front 23

Posterior

Back 23

Tail end found in animals with bilateral symmetry.

Front 24

Cephalization

Back 24

The tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal.

Front 25

Dorsal surface

Back 25

Backside, found in animals with bilateral symmetry.

Front 26

Ventral surface

Back 26

Underside or belly,found in animals with bilateral symmetry.