Chapter 28 invertebrates ✅

The nematode cuticle contains _____.

chitin

The rhynchocoel is a

fluid filled cavity

The embryonic development in nematodes can have up to __________ larval stages.

four

Flies are_______.

hexapods

Which group of flatworms are primarily ectoparasites of fish?

monogeneans

The large central opening in the parazoan body is called the:

osculum

Echinoderms have _____.

pentaradial symmetry

Cubozoans are

polymorphs

Annelids have (a):

true coelom

The circulatory fluid in echinoderms is _____.

water

The sister taxon of the Chordata is the _____.

Ambulacraria

Which of the following statements is false? A. Choanocytes have flagella that propel water through the body. B. Pinacocytes can transform into any cell type. C. Lophocytes secrete collagen. D. Porocytes control the flow of water through pores in the sponge body.

B. Pinacocytes can transform into any cell type.

While collecting specimens, a marine biologist finds a sessile Cnidarian. The medusas that bud from it swim by contracting a ring of muscle in their bells. To which class does this specimen belong?

Class Scyphozoa

Crustaceans are _____.

Ecdysozoans

Which of the following is not a key advantage provided by the exoskeleton of terrestrial arthropods?

Grows with the arthropod throughout its life

Which of the following features does not distinguish humans as a member of phylum Chordata?

Human embryos undergo indeterminate cleavage.

How does segmentation enhance annelid locomotion?

Muscle contractions can be localized to specific regions of the body to coordinate movement.

Cnidocytes are found in

Phylum Cnidaria

A mantle and mantle cavity are present in:

Phylum Mollusca

Most sponge body plans are slight variations on a simple tube-within-a-tube design. Which of the following is a key limitation of sponge body plans?

The reliance on osmosis/diffusion requires a design that maximizes the surface area to volume ratio of the sponge.

Which of the following statements about insects is false?

The trachea is part of the digestive system.

Which of the following statements about the anatomy of a mollusk is false?

The digestive system includes a gizzard, a stomach, a digestive gland, and the intestine.

Mesohyl contains:

a collagen-like gel and suspended cells for various functions