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Questions and Answers
What is a defining feature of Platyhelminthes (Flatworms)?
How do Platyhelminthes reproduce?
What do Nematodes feed on?
Which invertebrate group has both male and female reproductive organs?
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What is a common characteristic of Arachnids?
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Which body section do insects have six legs attached to?
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Study Notes
Characteristics of Animals
- Animals are multicellular, eukaryotes
- Animals are heterotrophs (consumers)
Invertebrates
- Animals without a backbone
- Examples: Porifera (sea sponges), Cnidaria (coelenterates), Mollusks, Echinoderms, Helminths (worms), Arthropods
Porifera (Sea Sponges)
- Sessile, pore bearer
- Filter feeder, has large opening (Osculum)
- Has spicules, incurrent pores (ostia)
- Can reproduce sexually or asexually
Cnidaria (Coelenterates)
- Have sting cells or stingers (nematocyst)
- Examples: Hydra, Portuguese Man O' War, Sea Jellies
Mollusks
- Soft-bodied, mantle sometimes forms a hard, protective shell
- Examples: Snail, Slug, Clam, Mussel, Octopus
- Swimming mollusks: Cephalopods (Squid, Octopus, Nautilus)
Echinoderms (Spiny Skin)
- Has radial symmetry, identical parts arranged in circular fashion around the central axis
- Has tube feet, lives in water, has water vascular system
- Can regenerate and reproduce by fragmentation, commonly reproduce sexually
Helminths (Worms)
- Annelids: can live on land and water, has bilateral symmetry, breathes through skin
- Annelids: can reproduce asexually through fragmentation, as well as sexual reproduction, hermaphrodites
- Examples: Leeches, Planarians, Earthworms
Platyhelminthes (Flatworms)
- Bilaterally symmetrical, no anus, breathes through diffusion
- Simple brain, mostly parasites, hermaphrodites
- Can reproduce asexually by fission and regeneration, as well as sexually through self-fertilization
Nematodes
- Feeds on bacteria, fungi, and other nematodes, also parasitic
- Examples: Roundworm, Whipworms
- Parasites, spread through various means, preventive measures can reduce risk of infection
Arthropods
- Presence of multiple joints, chitinous exoskeleton, segmentation, and open circulatory system
- Exoskeleton for protection and body support, jointed legs for movement
- Examples: Insects (6 legs), Arachnids (8 legs), Crustaceans (5 pairs = 10 legs), Myriapods (Multiple legs)
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Description
Test your knowledge on invertebrates and animal classification with this quiz. Questions cover topics such as prokaryotes vs eukaryotes, heterotrophs vs autotrophs, animal identification, and the importance of studying the Animal Kingdom.
