ENT 201 STUDY GUIDE 2025/2026 QUESTIONS AND
ANSWERS RATED A+
✔✔Insecta (class) - ✔✔arthropods, 3 major body regions, 6 legs, 1 pair of antenna,
winged adults WINGS
✔✔Instar - ✔✔The name of the stage after an insect molts. Adults are "Perfect" ...
✔✔juvenile hormone (JH) - ✔✔A chemical produced indirectly by the insect's brain that
tells the epidermis what kind of cuticle to make when it next molts. High JH =
larval/nymphal cuticle, little JH = pupal, No JH = Adult
✔✔Molting hormone (MH) - ✔✔Chemical that signals epidermis to begin making new
exoskeleton
✔✔Labium - ✔✔The "bottom lip" of an insect. Often have sensory, leg-like palps which
work much like the palps on the maxillae.
✔✔Labrum - ✔✔Upper lip
✔✔Larva - ✔✔One stage of complete metamorphosis, no wings, no compound eyes,
✔✔Linneaus - ✔✔The father of modern classification.
✔✔Malpighian tubules - ✔✔"kidneys", Responsable for collecting metabolic waste, at
the beginning of the hind-gut
✔✔Mandibles - ✔✔"jaws" on insect with chewing mouth parts
✔✔Maxilla - ✔✔leg like appendages in insects mouth that help manipulate food.
✔✔Meosis - ✔✔The process that occurs in the formation of sex cells (sperm and egg)
by which the number of chromosomes is reduced by half.
✔✔Micropyle - ✔✔Tiny hole in insect egg that allows for the sperm to fertilize the egg.
✔✔Molting Fluid - ✔✔The substance secreted by the epidermis that recycles the old
endocuticle when the insect is preparing to molt.
✔✔Membranous - ✔✔Filmy and transparent, wings look like they are covered in cling
wrap
✔✔Natatorial - ✔✔Adapted to swim.
, ✔✔Nymph - ✔✔The immature stage of an insect that goes through incomplete
metamorphosis. Often quite similar to adults, with similar mouthparts; often have
compound eyes and visible wing pads that get larger with each successive molt.
✔✔ocellus - ✔✔Simple eyes that cannot make a compound image but can detect color,
light, and dark.
✔✔Oncychphora - ✔✔A phylum of insects. They have many un-jointed legs.
Peripatatus is a living example of an Onychphoran.
✔✔Ootheca - ✔✔A protective structure many female insects construct around their
eggs. A product of the female's accessory glands. A mantid's has the texture of
Styrofoam; a roach's looks like a tiny purse.
✔✔Oviparous - ✔✔egg laying
✔✔Ovipositor - ✔✔An appendage used to lay eggs, The ovipositor can be modified into
a defensive stinger
✔✔Ovoviviparous - ✔✔egg hatches immediately after laying
✔✔Paedeogenesis - ✔✔Parthenogenic reproduction by an immature form; happens in
some insect larvae. (kids having kids)
✔✔parthogenesis - ✔✔Reproduction without mating, usually results in clone of the
mother (babies without sex)
✔✔Plastron - ✔✔an air bubble trapped by hydrophobic setae in some aquatic insects
which enhances gas exchange
✔✔Polyembryony - ✔✔The condition where a single egg splits into many embryos,
producing that many clones of the original egg. (one egg, many kids)
✔✔Probocis - ✔✔a feeding structure evolved from the chewing mouthparts of ancestral
insects found in some modern insects that feed on liquid diets like nectar.
✔✔Pronotum - ✔✔the top plate on the prothoracic segment. Often highly modified for
defense, mating contests, or camouflage purposes.
✔✔Pterygota - ✔✔winged insects
✔✔Pupa - ✔✔The third stage of complete metamorphosis, in which a larva develops
into an adult insect. (not mobile, doesn't eat, doesn't excrete
ANSWERS RATED A+
✔✔Insecta (class) - ✔✔arthropods, 3 major body regions, 6 legs, 1 pair of antenna,
winged adults WINGS
✔✔Instar - ✔✔The name of the stage after an insect molts. Adults are "Perfect" ...
✔✔juvenile hormone (JH) - ✔✔A chemical produced indirectly by the insect's brain that
tells the epidermis what kind of cuticle to make when it next molts. High JH =
larval/nymphal cuticle, little JH = pupal, No JH = Adult
✔✔Molting hormone (MH) - ✔✔Chemical that signals epidermis to begin making new
exoskeleton
✔✔Labium - ✔✔The "bottom lip" of an insect. Often have sensory, leg-like palps which
work much like the palps on the maxillae.
✔✔Labrum - ✔✔Upper lip
✔✔Larva - ✔✔One stage of complete metamorphosis, no wings, no compound eyes,
✔✔Linneaus - ✔✔The father of modern classification.
✔✔Malpighian tubules - ✔✔"kidneys", Responsable for collecting metabolic waste, at
the beginning of the hind-gut
✔✔Mandibles - ✔✔"jaws" on insect with chewing mouth parts
✔✔Maxilla - ✔✔leg like appendages in insects mouth that help manipulate food.
✔✔Meosis - ✔✔The process that occurs in the formation of sex cells (sperm and egg)
by which the number of chromosomes is reduced by half.
✔✔Micropyle - ✔✔Tiny hole in insect egg that allows for the sperm to fertilize the egg.
✔✔Molting Fluid - ✔✔The substance secreted by the epidermis that recycles the old
endocuticle when the insect is preparing to molt.
✔✔Membranous - ✔✔Filmy and transparent, wings look like they are covered in cling
wrap
✔✔Natatorial - ✔✔Adapted to swim.
, ✔✔Nymph - ✔✔The immature stage of an insect that goes through incomplete
metamorphosis. Often quite similar to adults, with similar mouthparts; often have
compound eyes and visible wing pads that get larger with each successive molt.
✔✔ocellus - ✔✔Simple eyes that cannot make a compound image but can detect color,
light, and dark.
✔✔Oncychphora - ✔✔A phylum of insects. They have many un-jointed legs.
Peripatatus is a living example of an Onychphoran.
✔✔Ootheca - ✔✔A protective structure many female insects construct around their
eggs. A product of the female's accessory glands. A mantid's has the texture of
Styrofoam; a roach's looks like a tiny purse.
✔✔Oviparous - ✔✔egg laying
✔✔Ovipositor - ✔✔An appendage used to lay eggs, The ovipositor can be modified into
a defensive stinger
✔✔Ovoviviparous - ✔✔egg hatches immediately after laying
✔✔Paedeogenesis - ✔✔Parthenogenic reproduction by an immature form; happens in
some insect larvae. (kids having kids)
✔✔parthogenesis - ✔✔Reproduction without mating, usually results in clone of the
mother (babies without sex)
✔✔Plastron - ✔✔an air bubble trapped by hydrophobic setae in some aquatic insects
which enhances gas exchange
✔✔Polyembryony - ✔✔The condition where a single egg splits into many embryos,
producing that many clones of the original egg. (one egg, many kids)
✔✔Probocis - ✔✔a feeding structure evolved from the chewing mouthparts of ancestral
insects found in some modern insects that feed on liquid diets like nectar.
✔✔Pronotum - ✔✔the top plate on the prothoracic segment. Often highly modified for
defense, mating contests, or camouflage purposes.
✔✔Pterygota - ✔✔winged insects
✔✔Pupa - ✔✔The third stage of complete metamorphosis, in which a larva develops
into an adult insect. (not mobile, doesn't eat, doesn't excrete
