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Cnidaria: Body Forms and Anthozoa

Cnidaria: Body Forms and Anthozoa

Explore Cnidaria's overview, body forms, and Anthozoa class. Focus on their two-layered structure, cnidocytes for predation, and the polyp and medusa forms. Understand Anthozoa's anemones and corals, and their marine, sessile polyp existence.

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Cnidaria: Body Forms and Anthozoa

Quiz • 30 Questions

Cnidaria: Body Forms and Anthozoa - Flashcards

Flashcards • 15 Cards

Study Notes

5 min • Summary

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List of Questions30 questions
  1. Question 1
    • Cnidocytes contain a thread filled with toxin and a barbed head. When triggered, these structures allow Cnidaria to inject venom and paralyze prey, facilitating capture and consumption.
  2. Question 2
    • Bilateral symmetry allows for cephalization, concentrating sensory organs and a nervous system at one end of the body. This facilitates directed movement and more efficient hunting or navigation during the larval stage.
  3. Question 3
    • Symbiotic algae provide corals with oxygen and organic carbon through photosynthesis, supporting their energy needs. Coral bleaching occurs when elevated ocean temperatures and increased carbon dioxide levels cause the corals to expel these algae.
  4. Question 4
    • The polyp form is sessile and attached to a substrate, optimized for filter feeding or capturing nearby prey. The medusa form is free-swimming and pelagic, adapted for active hunting and dispersal.
  5. Question 5
    • _Aeolid_ nudibranchs consume Cnidaria and extract the cnidocytes during digestion. They then store these cnidocytes in their own tentacles, using them for defense against predators.
  6. Question 6
    • Freshwater jellyfish can colonize new environments by traveling on birds or zebra mussels through a process called phoresy. This poses a problem because they can invade and disrupt existing ecosystems.
  7. Question 7
    • Metagenesis is the alternation of polyp and medusa forms in the life cycle of some Cnidaria. This allows them to exploit both sessile and mobile lifestyles, enhancing their ability to feed, reproduce, and disperse.
  8. Question 8
    • Cnidocytes contain a coiled, venom-filled thread that is explosively discharged upon contact. This injects paralyzing toxins into prey, allowing Cnidaria to immobilize and capture organisms much larger than themselves.
  9. Question 9
    • Clownfish live within the tentacles of anemones, gaining protection from predators that are susceptible to the anemone's sting. In return, clownfish clean the anemone and may provide nutrients through their waste.
  10. Question 10
    • The Portuguese Man o' War is a siphonophore, a colonial organism composed of individual zooids, each specialized for specific tasks like feeding or reproduction. True jellyfish are single organisms.
  11. Question 11
    • Ocean acidification, caused by increased atmospheric carbon dioxide dissolving in seawater, reduces the availability of carbonate ions. This hinders the ability of corals to build and maintain their calcareous skeletons, leading to structural weakening and reduced growth.
  12. Question 12
    • Cnidaria use tentacles armed with cnidocytes to capture prey. Prey is then brought into the gastrovascular cavity (internal cavity), where enzymes secreted by the gastrodermis (endoderm) aid in digestion; nutrients are absorbed, and waste is expelled through the same opening. They possess an external layer (ectoderm) and an internal layer (endoderm)
  13. Question 13
    • GFP is used as a bioluminescent marker in biological research, allowing scientists to track and visualize cellular processes. Overharvesting of _Aequorea victoria_ for GFP extraction raises conservation concerns.
  14. Question 14
    • The two main tissue layers are the ectoderm (outer layer) and the endoderm (inner layer). The ectoderm primarily functions in protection and sensory reception, while the endoderm is mainly involved in digestion.
  15. Question 15
    • Hydrozoans often exhibit an alternation of generations. The sessile polyp form reproduces asexually, giving rise to the medusa form, which reproduces sexually. The resulting larva settles and develops into a new polyp colony.
  16. Question 16
    • _Cubozoa_ have a cuboidal bell shape and possess complex eyes, allowing for active hunting. Unlike many jellyfish, their polyp stage directly transforms into the medusa, without strobilation.
  17. Question 17
    • Coral bleaching occurs when corals expel their symbiotic algae (zooxanthellae) due to stressors like elevated water temperatures. This causes the corals to lose their color and energy source, leading to starvation and potential death, which impacts the entire reef ecosystem.
  18. Question 18
    • _Hydra_ reproduce asexually through budding under favorable conditions (ample food and stable environment). When conditions are stressful, they switch to sexual reproduction, producing eggs and sperm to increase genetic diversity.
  19. Question 19
    • _Aeolid_ nudibranchs consume Cnidaria and carefully sequester the cnidocytes without triggering them. These unfired cnidocytes are then stored in specialized sacs (cnidosacs) within their cerata (dorsal appendages) and used for defense against predators.
  20. Question 20
    • _Ctenophora_ have eight rows of ciliary plates (ctenes) for locomotion rather than cnidocytes (except in some species that acquire them). They also have a statocyst for balance and exhibit biradial symmetry, while Cnidaria are primarily radial.
  21. Question 21
    • Cnidocytes contain a nematocyst, a capsule-like organelle containing a coiled, venom-injecting tubule. When triggered by physical or chemical stimuli, the nematocyst is rapidly discharged, injecting venom to paralyze prey or deter predators. The barbed structure helps to anchor the tubule in the target's tissue.
  22. Question 22
    • Cnidaria exhibit diverse locomotion methods. Sessile polyps like anemones remain attached. Medusae, like jellyfish, use pulsations of their bell for swimming. _Hydra_ can move by somersaulting using its tentacles, showcasing versatility within the phylum.
  23. Question 23
    • Bilateral symmetry in the planula larva allows for cephalization, which concentrates sensory organs and neural structures at one end of the body. This facilitates directed movement and improved sensory perception, enhancing the larva's ability to locate suitable settlement sites. This shows an evolutionary advantage of adapting different symmetries at different life stages.
  24. Question 24
    • _Cubozoa_ can cause economic problems by preying on fish populations, including commercially important species. They are also venomous, posing a threat to humans. Ecologically, they play a role in regulating prey populations, but their increasing presence can disrupt marine food webs.
  25. Question 25
    • Statocysts are sensory organs used for balance and orientation. Cnidaria have various sensory cells, including those that detect light and chemicals, but they lack statocysts. Ctenophora have statocysts which aid in detecting their orientation in the water column and help maintain balance, which contrasts with the sensory mechanisms of Cnidaria.
  26. Question 26
    • Coral reefs are built by coral polyps that secrete calcium carbonate skeletons. The symbiotic algae (zooxanthellae) within the polyps provide them with energy through photosynthesis, enhancing their growth and the deposition of calcium carbonate, which accumulates over time to form the reef structure.
  27. Question 27
    • Coral reefs face threats such as ocean acidification, rising sea temperatures, pollution, and overfishing. These threats lead to coral bleaching, habitat destruction, and loss of biodiversity, as reefs support a vast array of marine species.
  28. Question 28
    • The freshwater jellyfish can disperse by attaching to aquatic plants, birds, or other organisms (phoresy), aiding in its passive movement to new habitats. Its dormant polyp stage is also resistant to unfavorable conditions, facilitating colonization.
  29. Question 29
    • Warming oceans causes thermal stress to coral reefs. The algae will leave the corals and coral bleaching happens. The corals become stressed, turn white, and are more susceptible to disease and death.
  30. Question 30
    • Cnidaria have radial symmetry and cnidocytes and Ctenophora have bi-radial symmetry and colloblasts. Cnidaria are diploblastic meaning they have two layers - an external layer and an internal layer and a matrix in the middle. Ctenophora also have a diploblastic-like structure with an outer epidermis and an inner gastrodermis, separated by a gelatinous mesoglea.
List of Flashcards15 flashcards
  1. Card 1
    HintStinging cells characterize this animal group.Memory TipThink 'needle' for Cnidaria's stinging abilities.
  2. Card 2
    HintOne stays put, and the other swims free.Memory TipPolyp is 'planted,' Medusa 'moves.'
  3. Card 3
    HintThink of colorful, flowery sea creatures.Memory Tip'Antho' like 'flowers' = anemones and corals.
  4. Card 4
    HintThink of the classic jellyfish form.Memory TipMedusozoa = Medusa dominant.
  5. Card 5
    HintDeadly and see very well.Memory Tip'Cube' like box jellyfish.
  6. Card 6
    HintAlternation of generations.Memory TipMeta = change.
  7. Card 7
    HintA swimming larva with a front and back.Memory TipPlanula = planning where to go (bilateral).
  8. Card 8
    HintVariable body forms and freshwater members.Memory TipHydro = water; Hydra is a member.
  9. Card 9
    HintNot a single jellyfish, but a colony.Memory TipSiphon = many siphoning parts together.
  10. Card 10
    HintSea swallows, blue dragons, nudibranchs.Memory TipSome steal the Man o' War's sting!
  11. Card 11
    HintThe classic, large jellyfish.Memory TipScyphozoa = 'sky' jellyfish (big and floating).
  12. Card 12
    HintLoss of color spells danger for reefs.Memory TipBleaching = loss of algae.
  13. Card 13
    HintBalance and spatial awareness.Memory TipStat = static, to stay balanced.
  14. Card 14
    HintLiving light.Memory TipBio = life, luminescence = light.
  15. Card 15
    HintGreen glowing marker.Memory TipGFP = Green Fluorescent Protein.

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