Invertebrate Zoology: Test 1 Acoelmates And Pseudocoelomates

1. Which subdivision of Platyhelminthes contains the triclads?

Monogeneans

Turbellarians

Trematodes

Cestodes

Turbellarians are a subdivision of Platyhelminthes that contain triclads, while Cestodes, Trematodes, and Monogeneans are other subdivisions within the phylum with different characteristics and features.

Explanation

Turbellarians are a subdivision of Platyhelminthes that contain triclads, while Cestodes, Trematodes, and Monogeneans are other subdivisions within the phylum with different characteristics and features.

2. Class within Platyhelminthes, commonly known as flukes.

Cestoda

Trematoda

Nematoda

Annelida

Platyhelminthes is a phylum of invertebrates that includes flatworms. The class Trematoda consists of parasitic flukes, while Cestoda consists of tapeworms. Nematoda belong to the phylum Nematoda, which includes roundworms. Annelida is a separate phylum that includes segmented worms.

Explanation

Platyhelminthes is a phylum of invertebrates that includes flatworms. The class Trematoda consists of parasitic flukes, while Cestoda consists of tapeworms. Nematoda belong to the phylum Nematoda, which includes roundworms. Annelida is a separate phylum that includes segmented worms.

3. What is the genus of the flatworm shown here?

Bdelloura

Planaria

Schistosoma

Taenia

Bdelloura is the correct genus of the flatworm shown in the image. Planaria, Schistosoma, and Taenia are incorrect genera of flatworms and do not match the characteristics of the flatworm shown.

Explanation

Bdelloura is the correct genus of the flatworm shown in the image. Planaria, Schistosoma, and Taenia are incorrect genera of flatworms and do not match the characteristics of the flatworm shown.

4. What is the function of Rhabdites?

They are defensive structures whose discharge produces a protective, sticky coat around the organism when in contact with water

They aid in digestion of food particles.

They function as sensory receptors.

They help in reproduction of the organism.

Rhabdites are specialized cells found in certain organisms that serve as defensive structures, releasing a sticky coating in the presence of water to protect the organism from threats.

Explanation

Rhabdites are specialized cells found in certain organisms that serve as defensive structures, releasing a sticky coating in the presence of water to protect the organism from threats.

5. What is the larva of the tapeworm known as?

Onchosphere

Metacestode

Proglottid

Cysticercus

The larva of a tapeworm is known as an onchosphere, which is the first stage of development in the life cycle of a tapeworm. The other options are different stages or parts of a tapeworm but do not specifically refer to the larval stage.

Explanation

The larva of a tapeworm is known as an onchosphere, which is the first stage of development in the life cycle of a tapeworm. The other options are different stages or parts of a tapeworm but do not specifically refer to the larval stage.

6. What are the segments called in Cestodes?

Flukes

Tapeworms

Proglottids

Scolex

In Cestodes, the segments are called proglottids, which are responsible for reproduction and contain eggs. The scolex is the head of a tapeworm that has suckers or hooks for attachment, tapeworms are a type of parasitic flatworms, and flukes are another type of parasitic worm belonging to the class Trematoda.

Explanation

In Cestodes, the segments are called proglottids, which are responsible for reproduction and contain eggs. The scolex is the head of a tapeworm that has suckers or hooks for attachment, tapeworms are a type of parasitic flatworms, and flukes are another type of parasitic worm belonging to the class Trematoda.

7. What is the 'head' structure of Cestodes (tapeworms)?

Taenia

Proglottids

Scolex

Strobila

The 'head' structure of Cestodes is known as the scolex, which is equipped with hooks and suckers for attachment to the host's intestine. Proglottids are segments behind the scolex, Strobila refers to the entire worm body consisting of multiple proglottids, and Taenia is a genus of tapeworms.

Explanation

The 'head' structure of Cestodes is known as the scolex, which is equipped with hooks and suckers for attachment to the host's intestine. Proglottids are segments behind the scolex, Strobila refers to the entire worm body consisting of multiple proglottids, and Taenia is a genus of tapeworms.

8. Which phylum of organisms use a protrusible proboscis to attach to hosts?

Nematodes (roundworms)

Platyhelminthes (flatworms)

Arthropods (insects)

Acanthocephalans (spiny-headed worms)

Acanthocephalans are known for their spiny-headed worms that use a protrusible proboscis to attach to hosts. Nematodes, Platyhelminthes, and Arthropods do not typically exhibit this specific behavior.

Explanation

Acanthocephalans are known for their spiny-headed worms that use a protrusible proboscis to attach to hosts. Nematodes, Platyhelminthes, and Arthropods do not typically exhibit this specific behavior.

9. What are the characteristics of Strongylids (hookworms)?

Male = absent reproductive organ (bursa) & female = absent ovary.

Male = large reproductive organ (bursa) female = large ovary that winds around the gut

Male = small reproductive organ (bursa) & female = small ovary that remains stagnant.

Male = medium reproductive organ (bursa) & female = medium ovary that shifts location.

Strongylids, or hookworms, are characterized by the male having a large reproductive organ called bursa while the female possesses a large ovary that winds around the gut. These features are essential for their reproductive functions and distinguish them from the incorrect options provided.

Explanation

Strongylids, or hookworms, are characterized by the male having a large reproductive organ called bursa while the female possesses a large ovary that winds around the gut. These features are essential for their reproductive functions and distinguish them from the incorrect options provided.