Quiz on Animal Organization and Germ Layers

Which of the following statements about diploblastic animals is TRUE?

• A) They possess all three germ layers.

• B) They lack a true coelom.

• C) They include all vertebrates.

• D) They are more complex than triploblastic animals.

The outermost layer of cells in an embryo is called the:

• A) Mesoderm

• B) Endoderm

• C) Ectoderm

• D) Coelom

The lining of the digestive tract is derived from the:

• A) Ectoderm

• B) Mesoderm

• C) Endoderm

• D) Coelom

Which of the following phyla does NOT exhibit tissue-level organization?

• A) Porifera

• B) Cnidaria

• C) Platyhelminthes

• D) Annelida

Based on the text, which of the following statements about animal organization is TRUE?

• A) All animals exhibit the same level of organization.

• B) Cellular organization is the most complex.

• C) Organ system level represents the highest degree of complexity.

• D) Tissue-level organization is only found in vertebrates.

Which of the following statements about symmetry is CORRECT?

• A) All animals exhibit bilateral symmetry.

• B) Radial symmetry is more advanced than bilateral symmetry.

• C) Asymmetrical animals have no defined body plan.

• D) Bilateral symmetry allows for greater specialization of body regions.

Which of the following phyla exhibits bilateral symmetry?

• A) Porifera

• B) Cnidaria

• C) Platyhelminthes

• D) Echinodermata (adults)

Which of the following statements about germ layers is INCORRECT?

• A) Germ layers are present in all animals.

• B) Germ layers give rise to different tissues and organs.

• C) The mesoderm is present in both diploblastic and triploblastic animals.

• D) The ectoderm gives rise to the nervous system.

Which of the following phyla includes animals with a gastrovascular cavity?

• A) Porifera

• B) Cnidaria

• C) Platyhelminthes

• D) Annelida

Animals with a cellular level of organization typically lack:

• A) Cells

• B) Tissues

• C) Organs

• D) All of the above