Podcast
Questions and Answers
Cnidaria are ______ (diplo or triploblastic)?
Cnidaria are ______ (diplo or triploblastic)?
diploblastic
All Protostomes and Deuterostomes are _____ (diplo or triploblastic)?
All Protostomes and Deuterostomes are _____ (diplo or triploblastic)?
triploblastic
Are cnidarians more organized than sponges?
Are cnidarians more organized than sponges?
True (A)
Are cnidarians more sessile or motile?
Are cnidarians more sessile or motile?
What do cnidarians feed on?
What do cnidarians feed on?
What makes cnidarians good predators?
What makes cnidarians good predators?
What are characteristics of the phylum Cnidaria?
What are characteristics of the phylum Cnidaria?
What is the stinging organelle?
What is the stinging organelle?
When a nematocyte is fired, its stimulus can achieve a velocity of _____ and an acceleration of ______.
When a nematocyte is fired, its stimulus can achieve a velocity of _____ and an acceleration of ______.
Nematocytes inject ____ into prey, easily immobilizing prey.
Nematocytes inject ____ into prey, easily immobilizing prey.
There are over ______ species in phylum Cnidaria. It is made up of _____ and _______.
There are over ______ species in phylum Cnidaria. It is made up of _____ and _______.
What is the trigger that creates osmotic pressure to effect a coil for nematocytes in cnidocytes?
What is the trigger that creates osmotic pressure to effect a coil for nematocytes in cnidocytes?
Cnidarians have the longest fossil history with specimens from over _______ years ago.
Cnidarians have the longest fossil history with specimens from over _______ years ago.
Are cnidarians more widespread in marine or freshwater? What region are they in?
Are cnidarians more widespread in marine or freshwater? What region are they in?
What are some examples of mutualistic relationships between cnidarians and other creatures?
What are some examples of mutualistic relationships between cnidarians and other creatures?
What are the four traditional classes of Cnidaria?
What are the four traditional classes of Cnidaria?
Which class is made up of hydroids, fire corals, Portuguese man-of-war?
Which class is made up of hydroids, fire corals, Portuguese man-of-war?
What is the largest class; including stony and soft corals, sea anemones?
What is the largest class; including stony and soft corals, sea anemones?
What class is made up of cube or box jellyfishes?
What class is made up of cube or box jellyfishes?
What class is made up of true jellyfishes?
What class is made up of true jellyfishes?
What is the fifth class of Cnidaria? What is special about it?
What is the fifth class of Cnidaria? What is special about it?
What is the word for when two different types of life forms can be presented in an organism?
What is the word for when two different types of life forms can be presented in an organism?
What are the two forms cnidaria can be in?
What are the two forms cnidaria can be in?
What is the more appropriate name for jellyfish now?
What is the more appropriate name for jellyfish now?
Which retains sac-like body plans? Polyps or Medusa?
Which retains sac-like body plans? Polyps or Medusa?
Medusa is essentially unattached polyp with tubular body widened and flattened into a _____ shape.
Medusa is essentially unattached polyp with tubular body widened and flattened into a _____ shape.
The polyp form has the tubular body with the mouth facing ______ and surrounded by ______.
The polyp form has the tubular body with the mouth facing ______ and surrounded by ______.
In the polyp form, the mouth leads to the ____ _____.
In the polyp form, the mouth leads to the ____ _____.
In the polyp form, the aboral end is connected to ______ by _____ _____.
In the polyp form, the aboral end is connected to ______ by _____ _____.
How do polyps reproduce asexually?
How do polyps reproduce asexually?
If polyp detaches from origin, it becomes a _____.
If polyp detaches from origin, it becomes a _____.
If the bud remains attached to the polyp that made it, it becomes ____.
If the bud remains attached to the polyp that made it, it becomes ____.
What is the form of cnidarians in medusa form?
What is the form of cnidarians in medusa form?
Study Notes
Characteristics of Phylum Cnidaria
- Cnidarians are diploblastic organisms with two cell layers.
- More organized than sponges, showing advanced morphological structure.
- Primarily sessile; some species can move.
Feeding and Predation
- Cnidarians are effective predators, able to kill and consume prey more complex than themselves.
- Their tentacles, equipped with nematocytes, aid in capturing prey.
Key Features of Cnidarians
- Possess cnidocytes that contain nematocytes, the stinging organelles.
- Exhibit radial symmetry and can exist as polyps or medusae.
- Lack excretory or respiratory systems and coelomic cavities.
- Have an incomplete digestive system, characterized by a gastrovascular cavity.
Nematocyte Functionality
- When triggered, nematocytes can achieve a velocity of 2 meters/sec and an acceleration of 40,000 times gravity.
- Inject toxins into prey, immobilizing them for consumption.
Diversity and Habitat
- Over 9,000 species exist in this phylum, including hydroids, sea anemones, and jellyfish.
- Cnidarians thrive in marine environments, particularly in warm tropical waters.
Relationships and Interactions
- Examples of mutualism include clownfish residing in sea anemones, hydroids on hermit crab shells, and defense mechanisms among various marine creatures.
Taxonomy of Cnidaria
- Four traditional classes: Hydrozoa, Scyphozoa, Cubozoa, Anthozoa.
- Hydrozoa includes hydroids and Portuguese man-of-war.
- Anthozoa encompasses stony and soft corals as well as sea anemones.
- Cubozoa represents box jellyfish, while Scyphozoa includes true jellyfish.
- Staurozoa is unique for lacking a medusa stage in its life cycle.
Body Plans and Forms
- Cnidarians exhibit a dimorphic body plan, existing as polyps or medusae.
- Polyp form is sedentary, while medusa is free-floating with a bell shape.
- Both forms retain sac-like body structures.
Reproductive Strategies
- Polyps reproduce asexually through budding, pedal laceration, or fission.
- Detached polyps develop into clones, while attached buds form colonies sharing a gastrovascular cavity.
Morphological Features
- The polyp has an upward-facing mouth surrounded by tentacles and connects to the substratum via a pedal disk.
- The medusa form is bell-shaped with a tetramerous symmetry.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge on Phylum Cnidaria, including sea anemones and jellyfish, with these flashcards. Each card presents a key concept related to cnidarians, such as their tissue organization and mobility. Perfect for biology students or anyone interested in marine life.
