BIO 116 Lab 3: Phylum Platyhelminthes Characteristics Quiz

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What is the primary function of the haptor (opisthaptor) in monogenean flatworms?

To facilitate respiration through gas exchange
To aid in the ingestion of food
To provide a means of locomotion
To anchor the worm to the host's skin or gills (correct)

Which of the following is the correct order of the life cycle stages in the digenean trematodes?

Miracidium -> Cercaria -> Sporocyst -> Redia -> Metacercaria -> Adult
Miracidium -> Redia -> Sporocyst -> Cercaria -> Metacercaria -> Adult
Miracidium -> Sporocyst -> Redia -> Cercaria -> Metacercaria -> Adult (correct)
Cercaria -> Sporocyst -> Redia -> Miracidium -> Metacercaria -> Adult

How do cestode (tapeworm) adults obtain nutrients if they lack a digestive system?

They rely on the host's digestive system to provide them with nutrients
They have a specialized feeding apparatus to ingest solid food
They engulf and digest host cells and tissues
They absorb nutrients through the body wall by diffusion (correct)

What is the primary function of the prohaptor in monogenean flatworms?

To serve as an anterior adhesive organ or sucker for attachment (B) Signup and view all the answers

What is the primary function of the tegument in platyhelminth flatworms?

To serve as a protective barrier against the host's digestive enzymes (A) Signup and view all the answers

Which of the following is a characteristic of the nervous system in platyhelminth flatworms?

They have a diffuse, decentralized nervous system without a distinct brain (A) Signup and view all the answers

What is the primary function of the oral sucker and acetabulum in digenean trematodes?

To serve as attachment organs and prevent dislodgement from the host (A) Signup and view all the answers

What is the significance of the pseudometameric condition in cestode (tapeworm) adults?

It allows each segment to exist independently and reproduce asexually (B) Signup and view all the answers

What is the primary function of the pharynx in platyhelminth flatworms?

To facilitate the ingestion and transport of food through the digestive system (D) Signup and view all the answers

What is the defining advantage of the dorsoventrally flat body shape of Phylum Platyhelminthes?

Maximizes surface area to volume ratio for sufficient gas exchange (C) Signup and view all the answers

What is the significance of the indirect, complex life cycle in digenean trematodes?

It increases the parasite's chances of survival by requiring multiple hosts (C) Signup and view all the answers

What is the main disadvantage of being dorsoventrally flat in Phylum Platyhelminthes?

Inability to stay in dry and hot environments (D) Signup and view all the answers

Which part of the body wall of Phylum Platyhelminthes consists of a group of cilia that secrete mucus for locomotion or defense?

Rhabdites (D) Signup and view all the answers

In Phylum Platyhelminthes, what is the function of Protonephridia with flame cells or solenocytes?

Excretion (C) Signup and view all the answers

Which gland system in Phylum Platyhelminthes provides temporary adhesion to the substratum?

Dougland Adhesive System (C) Signup and view all the answers

What type of secretion do Rhabdoids in Platyhelminthes produce that is used for defense?

Nematocysts (C) Signup and view all the answers

What is the main function of the muscles in Phylum Platyhelminthes that are organized as outer circular, middle diagonal, and inner longitudinal layers?

Locomotion (B) Signup and view all the answers

What is the primary advantage of the ciliary locomotion observed in Phylum Platyhelminthes?

Enables efficient gas exchange (B) Signup and view all the answers

What is the primary difference between a simple pharynx and a plicate/folded pharynx in Phylum Platyhelminthes?

The ability to extend and retract (A) Signup and view all the answers