Embryonic Development and the Coelom

The ectoderm is on the outside of the developing embryo.

• True

• False

Tags

NGSS.HS-LS1-4

The innermost layer of the blastocyst is the

• endoderm

• gastrula

• ectoderm

• mesoderm

The middle layer of the blastocyst is the

• endoderm

• ectoderm

• mesoderm

• deuterostome

Tags

NGSS.HS-LS1-4

Single layer of cells surrounding a fluid-filled space that forms during early development

• morula

• gastrula

• blastocyst

• blastula

What stage of embryonic development is shown here?

• Zygote

• Blastula

• Gastrula

• Makitupula

Tags

NGSS.HS-LS1-4

This image shows the development of a sea urchin. What phase is shown labeled (g) ?

• egg

• zygote

• blastula

• gastrula

• larva

Tags

NGSS.HS-LS1-4

NGSS.HS-LS1-2

Which Phylum has organisms that are diploblastic?

• Porifera

• Cnidaria

• Mollusca

• Chordata

Which Phylum has organisms that do not have tissue layers?

• Porifera

• Cnidaria

• Mollusca

• Chordata

Tags

NGSS.MS-LS4-2

Which Phylum has organisms that are triploblastic?

• Porifera

• Cnidaria

• Mollusca

• Chordata

Diploblastic means:

• having no true tissue.

• having two tissue layers.

• having three tissue layers.