Ch 33: The Animal Body Plan Test Review

Which group of animals lacks any definite symmetry?

• Eumetazoa

• Radial symmetry animals

• Bilateral symmetry animals

• Sponges

What is the term used to describe animals other than sponges that have symmetry?

• Asymmetrical

• Eumetazoa

• Radial

• Bilateral

What are the two main types of symmetry in animals?

• Asymmetrical and Symmetrical

• Radial and Asymmetrical

• Radial and Bilateral

• Bilateral and Eumetazoa

What type of symmetry can be observed in an organism whose body parts are arranged around a central axis?

• Asymmetry

• Bilateral symmetry

• Radial symmetry

• None of the above

Which plane bisects an animal with bilateral symmetry into two equal halves?

• Frontal plane

• Transverse plane

• Sagittal plane

• Horizontal plane

What is the characteristic of body parts in organisms with radial symmetry when bisected?

In bilateral symmetry, how are the body halves of the organism defined?

• Completely asymmetrical

• Identical on all planes

• Mirror images of right and left halves

• Arranged around a central axis

How do small, unicellular organisms primarily obtain nutrients?

• Through specialized cells

• By ingestion

• Through diffusion

• Using organ systems

What is the constraint on cell size for unicellular organisms?

• Cell complexity

• Surface area-to-volume ratio

• Number of organelles

• Cell shape

What happens to the surface area-to-volume ratio as a cell gets larger?

• It increases

• It stays the same

• It decreases

• It is not affected by cell size