Podcast
Questions and Answers
What is the primary characteristic of organisms in the Phylum Platyhelminthes?
What is the primary characteristic of organisms in the Phylum Platyhelminthes?
All members of the Phylum Platyhelminthes are free-living organisms.
All members of the Phylum Platyhelminthes are free-living organisms.
False (B)
Name one class that comprises organisms within the Phylum Platyhelminthes.
Name one class that comprises organisms within the Phylum Platyhelminthes.
Turbellaria
Members of the Phylum Platyhelminthes can be described as __________, meaning they have three germ layers but lack a body cavity.
Members of the Phylum Platyhelminthes can be described as __________, meaning they have three germ layers but lack a body cavity.
Signup and view all the answers
Match the class of Platyhelminthes to their corresponding lifestyle:
Match the class of Platyhelminthes to their corresponding lifestyle:
Signup and view all the answers
What is the primary feature of the subepidermal nerve plexus?
What is the primary feature of the subepidermal nerve plexus?
Signup and view all the answers
A primitive brain is present in organisms with nerve cords and ring commissures.
A primitive brain is present in organisms with nerve cords and ring commissures.
Signup and view all the answers
What type of pattern do the nerve cords and connecting nerves form?
What type of pattern do the nerve cords and connecting nerves form?
Signup and view all the answers
The subepidermal nerve plexus and longitudinal nerve cords consist of ___ nerve cord pairs lying under the musculature.
The subepidermal nerve plexus and longitudinal nerve cords consist of ___ nerve cord pairs lying under the musculature.
Signup and view all the answers
Match the sensory structures to their functions.
Match the sensory structures to their functions.
Signup and view all the answers
What is the primary function of the dual-gland adhesive organs?
What is the primary function of the dual-gland adhesive organs?
Signup and view all the answers
Rhabdites are involved in locomotion by facilitating attachment to surfaces.
Rhabdites are involved in locomotion by facilitating attachment to surfaces.
Signup and view all the answers
What types of muscles are present in the planarian for locomotion?
What types of muscles are present in the planarian for locomotion?
Signup and view all the answers
The __________ surface of a planarian is ciliated and aids in locomotion.
The __________ surface of a planarian is ciliated and aids in locomotion.
Signup and view all the answers
Match the following structures with their functions in planarians:
Match the following structures with their functions in planarians:
Signup and view all the answers
Which of the following cells are involved in producing adhesive secretions?
Which of the following cells are involved in producing adhesive secretions?
Signup and view all the answers
Circular muscles are responsible for the longitudinal movement in planarians.
Circular muscles are responsible for the longitudinal movement in planarians.
Signup and view all the answers
What is the primary function of the flame cell in osmoregulation?
What is the primary function of the flame cell in osmoregulation?
Signup and view all the answers
What is the role of anchor cells in the locomotion of planarians?
What is the role of anchor cells in the locomotion of planarians?
Signup and view all the answers
The mesh cup in the protonephridium is responsible for drawing in fluid through flagellar motion.
The mesh cup in the protonephridium is responsible for drawing in fluid through flagellar motion.
Signup and view all the answers
What do the flagella present in the flame cell do?
What do the flagella present in the flame cell do?
Signup and view all the answers
The modified fluid in the tubule system is eventually eliminated through the ________.
The modified fluid in the tubule system is eventually eliminated through the ________.
Signup and view all the answers
Match the following parts of a protonephridium with their functions:
Match the following parts of a protonephridium with their functions:
Signup and view all the answers
What does the term 'protonephridium' mean in Greek?
What does the term 'protonephridium' mean in Greek?
Signup and view all the answers
The tubule system reabsorbs all filtered fluids without modification.
The tubule system reabsorbs all filtered fluids without modification.
Signup and view all the answers
Describe the relationship between the flame cell and the tubule in osmoregulation.
Describe the relationship between the flame cell and the tubule in osmoregulation.
Signup and view all the answers
Study Notes
Phylum Platyhelminthes
- Flatworms, flukes, and tapeworms are included in this phylum
- Flatworms are characterized by a variety of body forms and structures, from free-living forms to parasitic forms
Introduction
- Phylum Platyhelminthes is a group of invertebrates
- Flatworms are triploblastic acoelomates
- They show bilateral symmetry
- They exhibit a tissue-organ level of organization
Body Form and Structures
- The body plan is dorsoventrally flattened
- A single gastrovascular cavity acts as both mouth and anus
- These worms lack a coelom
- The epidermis has cilia for locomotion (in some species)
- Rhabdite cells produce rod-shaped structures for defense or adhesion
Osmoregulation
- Flatworms utilize protonephridia for osmoregulation
- Protonephridia consist of a network of tubules
- Flame cells filter fluid from the body cavity
- The filtrate is then transported out of the body through pores
Nervous Tissue
- The nervous system in flatworms is relatively simple
- Some species have a pair of nerve cords that run along the body
- Other species have a diffuse network of nerve cells
- Some flatworms have a primitive brain called a cerebral ganglion
- Simple sensory organs (tactile receptors, chemoreceptors, statocysts, photoreceptors) are present
Parasitic Strategies
- Some plathelminths are parasitic
- They have adaptations that allow them to survive and reproduce in their hosts.
- Examples of this include specialized structures for attachment and nutrient uptake as well as ways to avoid host defenses.
- The parasitic lifestyle can be internal or external
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
This quiz covers essential topics related to Phylum Platyhelminthes, including the characteristics of flatworms, flukes, and tapeworms. It explores their body forms, structures, osmoregulation, and nervous tissue organization. Test your knowledge on these fascinating invertebrates and their unique adaptations.
