Animal Body Organization and Germ Layers

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Which of the following organisms lacks a germ layer?

Platyhelminthes
Chordata
Porifera (correct)
Cnidaria

Which germ layer gives rise to the epithelial lining of the digestive tract and associated organs?

Mesoderm
Both Ectoderm and Mesoderm
Ectoderm
Endoderm (correct)

Which of the following is an example of a pseudocoelom?

Echinodermata
Nematoda (correct)
Annelida
Mollusks

What is the term for individual cells during the division of a zygote?

Blastomere (B) Signup and view all the answers

Which of the following groups of organisms is characterized by determinate cleavage?

Protostomes (A) Signup and view all the answers

What is the function of the prostomium in earthworms?

Directing deposits into the mouth (B) Signup and view all the answers

Which of the following organisms has a radula?

Snail (C) Signup and view all the answers

What is the function of the siphon in squid?

Ejecting ink (D) Signup and view all the answers

What is the characteristic of Trochozoans?

They have a trochophore larva. (C) Signup and view all the answers

What is the primary function of the spongocoel in Scypha (Porifera)?

It is where water passes through before going out to the osculum. (A) Signup and view all the answers

What is the function of the gizzard in earthworms?

Mechanical digestion (A) Signup and view all the answers

Which group of animals has a blastopore that forms the anus?

Deuterostomes (D) Signup and view all the answers

What is the function of the proboscis in houseflies?

Sucking liquid food (A) Signup and view all the answers

What is the function of the scolex in tapeworms?

Attaching to the host (C) Signup and view all the answers

What is the characteristic of Metameric segmentation?

Segments have the same morphology. (C) Signup and view all the answers

What is the function of ecdysteroids in Ecdysozoa?

They control the shedding of cuticle. (C) Signup and view all the answers

What is the characteristic of the epidermis in Dugesia (Platyhelminthes)?

It is a monolayered epithelium with cilia on the ventral surface. (B) Signup and view all the answers

What type of skeleton is found in sponges?

Hydrostatic skeleton (C) Signup and view all the answers

Which of the following phyla is characterized by the presence of a syncytial monolayer epidermis/hypodermis?

Nematoda (A) Signup and view all the answers

What is the main component of the shell in mollusks?

Calcium carbonate (C) Signup and view all the answers

Which type of cells is responsible for secretion of the cuticle in nematodes?

Syncytial monolayer epidermis/hypodermis (B) Signup and view all the answers

What is the function of rhabdites and gland cells in platyhelminthes?

Unknown function (B) Signup and view all the answers

In cnidarians, which tissue layer secretes the CaCO3 skeleton?

Mucus glands (A) Signup and view all the answers

What is the primary function of the pancreas in the digestive system?

Produce digestive enzymes (D) Signup and view all the answers

Which system is responsible for thermoregulation?

Nervous, endocrine, respiratory, and circulatory systems (D) Signup and view all the answers

What is the primary function of the stomach in the digestive system?

Temporary storage of food (C) Signup and view all the answers