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Phylum: CNIDARIA

Characteristics, Structure, Essential life functions

QuestionAnswer
What Phylum do Jellyfish, Anemones, Coral & Hydra fit into? Phylum CNIDARIA
What does CNIDARIA mean? Meaning "Nettle"
What are common characteristics of CNIDARIA'S Soft bodies with stinging tentacles, live individually or in colonies
Where do CNIDARIANS live? Live in marine water and some in freshwater
What symmetry do CNIDARIANS have Radical symmetry
How many germ layers do they have? 2 germ layers - diploblastic - ectoderm and endoderm
What are the 2 body forms? 1. Polyp - sessile (Hydra, coral, sea anemone) 2. Medusa - Mobile (jellyfish)
What are some body parts of CNIDARIANS? 1. Tentacle (body defence) 2. Mouth (feeding) 3. Gastrovascular cavity - GVC (where digestion happens 4. Mesoglea (connecting layer between ectoderm and endoderm)
What do Tentacles / Nematocysts do? - Nematocysts are in tentacles - Nematocysts are sting threads to capture prey + protection - Releases toxins after fired
What are cnidoblasts? Immature cells containing nematocysts
What are cnidocytes? mature cells containing nematocysts
Is there Cephalization? No cephalization (head)
What type of RESPONSE/ nervous system do CNIDARIANS have? Nerve Net - simple nerves spread through whole body - when triggered (by light, touch, chemicals, balance) they contract
How does FEEDING/DIGESTION/EXCRETION work? 1. Food is captured by nemoatocytes 2. Pulls food into mouth 3. Enters GVC 4. GVC lining produces enzymes 5. Nutrients taken into cells 6 Waste leaves through mouth (nitrogenous waste = diffusion)
How does RESPIRATION work? Diffusion (O2 enters, CO2 leaves)
what does MOVEMENT look like? Sessile (Polyp) or mobile (Medusa)
What does Asexual REPRODUCTION look like? Budding or Regenerate
What does Sexual REPRODUCTION look like? 1. Polyp buds off to form medusa and medusas mature 2.. Gametes (egg+sperm) release into water for fertilization - sometimes only sperm released 3. Once fertilized, zygote becomes a ciliated larva 4. Planula attaches to surface and develops into polyp
What are the classes of CNIDARIANS -Hyrozoa (Hydras) - Scyphozoa (jellyfish) - Anthozoa (sea anemone + coral)
Ecological importance Corals are important to build reefs Make habitat + food for fish Reef protect land from waves
Created by: chloe_well
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