19 Questions
What is a defining characteristic of sponges?
Simple organization
Which sub-branch of Coelenterates is characterized by hermaphroditic organisms?
Ctenaria
What is the main mode of water exchange in sponges?
Cavities, canals, and holes
Which class does the freshwater hydra belong to?
Hydrozoan
What is the function of special cells called colloblasts in Ctenaria?
Feeding by capturing prey
What is the substance that bonds the two layers of the hydra's body together?
Mesoglia
How does the hydra catch and paralyze its prey?
With tentacles that lead the prey to the mouth and cnidoblasts that secrete a paralyzing liquid
Which part of Taenia saginata attaches to the human intestine?
Scolex or head equipped with 4 suction cups with hooks
What is contained in each ring of Taenia saginata?
Male and female genitalia for fertilization
What is the developmental stage of Taenia saginata that is swallowed by the intermediate host (bovine)?
Larva equipped with 3 pairs of hooks and surrounded by a shell
Which of the following is true about Annelids?
They have a complete digestive tract with mouth and anus
What is the distinguishing feature of Hirudinea among the Annelids?
Being exclusively parasitic
Which statement is true about the leech's anatomy?
It has 5 pairs of eyes and 3 genital openings
What is the primary mode of respiration in Annelids?
By diffusion through the body wall
What distinguishes the circulatory system of Annelids from that of Nematodes (roundworms)?
Circulation driven by a central pump-like organ
What distinguishes Oligochaetes from Polychaetes among Annelids?
Hermaphroditic reproduction
What distinguishes Nemathelminthes (roundworms) from Annelids in terms of body covering?
Cylindrical body covered by a cuticle
Which statement is true about Ascaris, a parasite of the human intestine?
It has a mouth with 3 lips and an excretory orifice
Which feature distinguishes Annelids from Nemathelminthes in terms of reproduction?
Internal fertilization
Test your knowledge of invertebrate zoology with a focus on the characteristics of sponges and coelenterates. Learn about their simple organization, symmetry, and unique cellular structures.
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