Chapter 33 Animal Biology Quiz

Sponges are simple aquatic animals that lack true tissues, are sedentary (attached to a substrate), and are hermaphrodites. Starfish, earthworms, and frogs do not match all the given characteristics.

Choanocytes, also known as collar cells, are responsible for supporting the structure of sponges and also form gametes. Epidermal cells are mainly responsible for covering the outer surface of the sponge, while amoebocytes play a role in nutrient transport and spicule cells are responsible for producing the rigid structures within the sponge.

Amoebocytes are the cells in sponges that play a crucial role in nutrient transport and are located in the mesohyl. Spongin cells, Choanocytes, and Pinacocytes are other types of cells found in sponges but do not perform the same function as Amoebocytes.

Cnidarians are unique among the options listed due to their specific combination of features, such as radial symmetry, contractile tissues, and the presence of a gastrovascular cavity with a single opening. Additionally, the division into 4 distinct classes further distinguishes them from the other incorrect options.

Cnidarians, such as jellyfish and sea anemones, have two body plans - the stationary polyp form and the swimming medusa form. The correct answer refers to the stationary polyp form of Cnidarians.

Cnidarians exhibit different body plans throughout their life cycle, with the medusa stage being the motile form characterized by a bell-shaped body and tentacles for movement and feeding. The incorrect answers represent other stages or forms of cnidarians with distinct characteristics.

Cnidarians like jellyfish and corals use nematocysts, which are specialized stinging cells, to capture their prey. These cells contain a coiled stinging thread that can be discharged upon contact with prey.

Cnidaria, specifically Hydrozoans, are known for their life cycle that alternates between medusa and polyp stages in both freshwater and marine environments. The other options do not exhibit this specific characteristic in their life cycles.

Scyphozoans, part of the Cnidaria phylum, are known for their life cycle that involves polyp stage in coastal areas and medusa stage in open ocean.

The description provided matches the characteristics of Cubozoans, which are a type of Cnidarians known for their unique box-shaped medusa stage and highly toxic cnidocytes.

Polyps, sea anemone, and corals are all grouped under Cnidarian - Anthozoans due to their similar physical traits and classification within the animal kingdom. Echinoderms like sea stars, mollusks like clams, and arthropods like crabs belong to different animal groups and do not exhibit the same characteristics as Cnidarian - Anthozoans.

Lophotrochozoans are a large group of animals characterized by their shared characteristics of having 18 phyla, diverse body plans, being bilateral, coelomates, possessing a lophophore and trochophore larval stage. Deuterostomes, Ecdysozoans, and Cnidarians do not exhibit all the characteristics mentioned in the question.

Platyhelminthes, commonly known as flatworms, fit the description provided in the question. They are characterized by their flat, ribbon-like bodies and simple excretory systems. Other phyla mentioned in the incorrect answers have different characteristics and do not match the given description.

The given characteristics describe Lophotrochozoans, specifically belonging to the Phylum Platyhelminthes, with the species Tubellarians exhibiting these traits.

The correct answer describes the characteristics of Lophotrochozoans, specifically Platyhelminthes (flatworms) which include Monogeneans and Trematodes, known for their parasitic behaviors.

Platyhelminthes, specifically tapeworms, are known for their parasitic lifestyle in vertebrate hosts. They attach using suckers or hooks, lack a mouth and gastrovascular cavity, and reproduce using proglottids. The other options mentioned do not exhibit these specific characteristics of tapeworms.

The correct answer refers to the characteristics of lophotrochozoans, which include Platyhelminthes (flatworms) and Rotifers. The incorrect answers are other phyla of animals that do not match all the given characteristics.

The given characteristics match those of Lophotrochozoans, specifically Lophorates, which are marine organisms that have a U-shaped gut, lack a distinct head, possess a true coelom, and are colonial reef-building organisms with hard exoskeletons. The incorrect answers do not fully align with all the specified features.

The correct answer refers to ectoprocts, also known as the lamp shells, which are part of the lophorate phylum within the larger group of lophotrochozoans. They possess the described characteristics including a U-shaped alimentary canal, no distinct head, and being marine filter feeders with a sessile lifestyle. The incorrect options represent other marine organisms with different characteristics and classifications.

Molluscs are characterized by their soft bodies and hard protective shells, making them distinct from echinoderms, arthropods, and chordates.

The correct answer describes the characteristics of Chitons, which are marine mollusks belonging to the Lophotrochozoan superphylum. These animals have oval-shaped shells with 8 dorsal plates, cling to rocks using their feet equipped with suction cups, and use a radula to scrape algae off rocks. The incorrect answers do not match the specific characteristics provided in the question.