Insect Abdomen Anatomy
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Questions and Answers

What is the function of the abdominal segments in adult insects?

  • Digestion and excretion
  • Movement and locomotion
  • Reproduction and sensory functions (correct)
  • Respiration and circulation
  • What is the basic number of segments in the insect abdomen?

  • 13
  • 11 (correct)
  • 12
  • 10
  • Which type of insect larvae have lobe-like abdominal legs called prolegs?

  • Diptera
  • Coleoptera
  • Lepidoptera (correct)
  • Orthoptera
  • In which insect group is the first abdominal segment intimately fused with the thoracic segments?

    <p>Hymenoptera</p> Signup and view all the answers

    Where is the waist located in ants?

    <p>Between first abdominal segment and rest of abdomen</p> Signup and view all the answers

    What is the primary function of mechanosensitive sensilla found on abdominal segments?

    <p>Sensory perception</p> Signup and view all the answers

    What are the cerci in insects mainly used for?

    <p>All of the above</p> Signup and view all the answers

    In which insect are the cerci asymmetrical with the left cercus forming a clasping organ during copulation?

    <p>Male embiid, order Embioptera</p> Signup and view all the answers

    What are gills present on in nymph of many aquatic insects?

    <p>Abdominal segments</p> Signup and view all the answers

    Which insects have a pair of tubes known as cornicles that release an alarm pheromone when attacked by parasites or predators?

    <p>Aphids</p> Signup and view all the answers

    Where is the insect's genital opening located?

    <p>Just below the anus</p> Signup and view all the answers

    Which group of insects has the most diverse ovipositor morphology?

    <p>Hymenoptera</p> Signup and view all the answers

    What is one of the interesting modifications of the ovipositor found in stinging Hymenoptera?

    <p>It is modified into a stinger</p> Signup and view all the answers

    In which insect are the cerci long and filamentous, as long as or longer than the body?

    <p>Mayfly</p> Signup and view all the answers

    What function do some insects' glands opening on the abdomen serve?

    <p>Defense</p> Signup and view all the answers

    What purpose does the external genitalia serve in insects?

    <p>Mating</p> Signup and view all the answers

    Silverfish and nymph of Mayfly have long and filamentous cerci, as long as or longer than the body.

    <p>True</p> Signup and view all the answers

    The male cerci are generally symmetrical in some insects.

    <p>False</p> Signup and view all the answers

    The nymph of Ephemeroptera usually has six or seven pairs of plate-like or filamentous gills.

    <p>True</p> Signup and view all the answers

    Aphids release an alarm pheromone from their cornicles when attacked by parasites or predators.

    <p>True</p> Signup and view all the answers

    The insect's genital opening lies just above the anus.

    <p>False</p> Signup and view all the answers

    The most diverse ovipositor morphology is probably found in the Coleoptera.

    <p>False</p> Signup and view all the answers

    Some females of wasps have a very long, thin ovipositor which may be up to 7cm in length.

    <p>True</p> Signup and view all the answers

    The ovipositor of stinging Hymenoptera is modified into a stinger.

    <p>True</p> Signup and view all the answers

    The cerci in insects are mainly used for prey capture.

    <p>False</p> Signup and view all the answers

    Earwigs have powerful forceps which are usually straight and unarmed in the male.

    <p>False</p> Signup and view all the answers

    Most adult insects have appendages on their abdominal segments aside from those involved in reproduction and a pair of terminal cerci.

    <p>False</p> Signup and view all the answers

    The number of segments in the insect abdomen is always 11, plus the postsegmental telson.

    <p>False</p> Signup and view all the answers

    The waist of ants is located between the thorax and the abdomen.

    <p>False</p> Signup and view all the answers

    Aquatic nymphs often have segmental gills, while holometabolous larvae have lobe-like abdominal legs called prolegs.

    <p>True</p> Signup and view all the answers

    The first abdominal segment in Hymenoptera is intimately fused with the thoracic segments and is known as the propodeum.

    <p>True</p> Signup and view all the answers

    Most insects have mechanosensitive sensilla on their abdominal segments.

    <p>True</p> Signup and view all the answers

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