BIOL 113 Phylums Exam Questions and Answers| New Update with 100% Correct Answers
Sessile Fixed in one place.
Porous bodies Body full of pores for water circulation.
Choanocytes Flagellated collar cells that create water currents and trap food.
Parazoans Lack true tissues.
Mesohyl Gelatinous layer between cell layers.
Amoebocytes Mobile cells that distribute nutrients and form skeletal elements.
Spongocoel Central cavity water flows into.
Osculum Large opening where water exits.
Spicules Rigid skeletal elements made of calcium carbonate or silica.
Spongin Flexible skeletal protein fibers.
Suspension feeders Filter food particles from water.
Regeneration Able to regrow parts or reproduce asexually from fragments.
Radial symmetry Symmetry around a central axis.
, Diploblastic Two tissue layers (ectoderm and endoderm).
Gastrovascular cavity One opening for ingestion and excretion.
Cnidocytes Specialized stinging cells.
Nematocysts Stinging organelles inside cnidocytes.
Polyp Sessile, cylindrical body form (e.g., sea anemones).
Medusa Free-floating, bell-shaped body form (e.g., jellies).
Hydrostatic skeleton (Cnidaria) Fluid-filled cavity used for movement.
Nerve net Diffuse, non-centralized network.
Contractile fibers Present in epithelial cells for movement.
Feeding Carnivorous; tentacles capture prey.
Hydrozoa Alternate between polyp and medusa (e.g., hydras).
Scyphozoa Dominant medusa stage (true jellies).
Cubozoa Box jellies; highly venomous.
Sessile Fixed in one place.
Porous bodies Body full of pores for water circulation.
Choanocytes Flagellated collar cells that create water currents and trap food.
Parazoans Lack true tissues.
Mesohyl Gelatinous layer between cell layers.
Amoebocytes Mobile cells that distribute nutrients and form skeletal elements.
Spongocoel Central cavity water flows into.
Osculum Large opening where water exits.
Spicules Rigid skeletal elements made of calcium carbonate or silica.
Spongin Flexible skeletal protein fibers.
Suspension feeders Filter food particles from water.
Regeneration Able to regrow parts or reproduce asexually from fragments.
Radial symmetry Symmetry around a central axis.
, Diploblastic Two tissue layers (ectoderm and endoderm).
Gastrovascular cavity One opening for ingestion and excretion.
Cnidocytes Specialized stinging cells.
Nematocysts Stinging organelles inside cnidocytes.
Polyp Sessile, cylindrical body form (e.g., sea anemones).
Medusa Free-floating, bell-shaped body form (e.g., jellies).
Hydrostatic skeleton (Cnidaria) Fluid-filled cavity used for movement.
Nerve net Diffuse, non-centralized network.
Contractile fibers Present in epithelial cells for movement.
Feeding Carnivorous; tentacles capture prey.
Hydrozoa Alternate between polyp and medusa (e.g., hydras).
Scyphozoa Dominant medusa stage (true jellies).
Cubozoa Box jellies; highly venomous.
