Animal Development and Classification Concepts

Which of the following is a general characteristic of all animals?

• They make their own food.

• They are multicellular.

• They are prokaryotic.

• They are sessile throughout their life.

What type of symmetry is characterized by an animal being divisible into similar halves by multiple planes passing through its central axis, like a pie?

• Bilateral symmetry

• Asymmetry

• Radial symmetry

• Spherical symmetry

In the embryonic development of an animal, if the blastopore (the first embryonic opening) develops into the mouth, what is the animal classified as?

• Deuterostome

• Triploblastic

• Protostome

• Diploblastic

How many distinct germ layers are present in triploblastic animals during their embryonic development?

• One

• Two

• Three

• Four

Which phylum is characterized by having a pseudocoelom and two gut openings (a mouth and an anus)?

• Platyhelminthes

• Nematoda

• Mollusca

• Annelida

Which of the following phyla are known for having a true coelom and being protostomes?

• Platyhelminthes, Nematoda

• Mollusca, Annelida, Arthropoda

• Echinodermata, Chordata

• Porifera, Cnidaria

What unique characteristic do adult animals in the phylum Echinodermata possess, distinguishing them from many other animal phyla?

• Bilateral symmetry

• Cephalization

• Radial symmetry

• A pseudocoelom

What is the defining characteristic of animals in the phylum Chordata?

• Presence of an exoskeleton

• Having a notochord at some point in their development

• Being exclusively aquatic

• Possessing a segmented body throughout their life