ENT 201 EVALUATION EXAMS 2025/2026 QUESTIONS AND
ANSWERS RATED A+
✔✔(T/F) The exoskeleton covers the entire outer body surface and some mouthparts or
internal surfaces - ✔✔True
✔✔(T/F) The tube/cylinder shape of the exoskeleton makes it light and flexible -
✔✔True
✔✔(T/F) Molting replaces outside, mouthparts, and trachea - ✔✔True
✔✔Do adults or the immature have thicker, more ridges surfaces? - ✔✔Adults
✔✔The exoskeleton (suit of armor) composition - ✔✔Basement membrane, Epidermis,
and the cuticle
✔✔(T/F) Epidermis is only living to make the rest of the exoskeleton and create the
cuticle - ✔✔True
✔✔(T/F) Epidermis also controls color shape, thickness, bumps, and spines - ✔✔True
✔✔What does the basement membrane do? - ✔✔It separates inside from outside
✔✔What 3 main parts does the cuticle have? - ✔✔1. Endocuticle: bottom, soft, and
flexible, protein and chain matrix, (present almost everywhere)
2. Exocuticle: Middle, hard, rigid, tanned, protein + chitin + phenolics = sclerotin (not
always present)
3. Epicuticle: Very thin top layer, waterproofing (main job), protein + wax + cement,
(present almost everywhere)
✔✔Chitin - ✔✔Polymer-long chain of N-acetyl glucosamine (present inmost Arthropod
exoskeleton)
✔✔Resilin - ✔✔Rubbery protein for hinges, levers, membranes, wings, or legs to lighten
weight or provide bounce (ENABLE MOVEMENT)
✔✔Other outgrowths and ingrowths exist such as what? - ✔✔An example would be
warts, hairs, bumps, spines, spurs, and setae
✔✔What are the advantages? - ✔✔Lightweight, protective against acids, pathogens,
etc., protects against water loss
, ✔✔What are the disadvantages? - ✔✔Must molt in order to grow, makes vulnerable and
limits size that a terrestrial animal can become
✔✔What are the 2 functions of the head?* - ✔✔1. Take in food
2. Sense outside world
"The center for sensing and eating"
-Fusion of 6 segments into a hard capsule
- Appendages modifies to form mouthparts*
✔✔Compound eyes - ✔✔Form mosaic, more facets (hexagons) = higher resolution
-See color but different than humans (ex. cannot see red but can see ultraviolet) (violet,
blue, green, yellow)
-Can highly detect motion and polarization
✔✔Ocelli - ✔✔Simple eyes or single cells with a lens and a few nerves which can sense
light intensity and some movement (helps with circadian rhythm or shadows)
-No complex images
-Usually found on adult and larval insects but usually not on those who go through
complete metamorphosis
✔✔Antennae - ✔✔Always comes in pairs, and they have no muscles in the long parts,
most important sense organs.
-Increases surface area for chemoreception
-Many functions sense wind, touch, taste, hear, smell, and wind speed for flying
Made of:
-Scape - base
Pedicel- first segment
Flagellum- reaches
✔✔Mouth: (T/F) Some adults only mate and do not eat - ✔✔True
✔✔(T/F) Chewing mouthparts are the most primitive - ✔✔True
✔✔Layout of chewing mouthparts - ✔✔*The original layout with labrum, 2 mandibles, 2
maxillae, labium and hypo pharynx
1. Labrum: Upper lip - 2 fused appendages to keep food in
ANSWERS RATED A+
✔✔(T/F) The exoskeleton covers the entire outer body surface and some mouthparts or
internal surfaces - ✔✔True
✔✔(T/F) The tube/cylinder shape of the exoskeleton makes it light and flexible -
✔✔True
✔✔(T/F) Molting replaces outside, mouthparts, and trachea - ✔✔True
✔✔Do adults or the immature have thicker, more ridges surfaces? - ✔✔Adults
✔✔The exoskeleton (suit of armor) composition - ✔✔Basement membrane, Epidermis,
and the cuticle
✔✔(T/F) Epidermis is only living to make the rest of the exoskeleton and create the
cuticle - ✔✔True
✔✔(T/F) Epidermis also controls color shape, thickness, bumps, and spines - ✔✔True
✔✔What does the basement membrane do? - ✔✔It separates inside from outside
✔✔What 3 main parts does the cuticle have? - ✔✔1. Endocuticle: bottom, soft, and
flexible, protein and chain matrix, (present almost everywhere)
2. Exocuticle: Middle, hard, rigid, tanned, protein + chitin + phenolics = sclerotin (not
always present)
3. Epicuticle: Very thin top layer, waterproofing (main job), protein + wax + cement,
(present almost everywhere)
✔✔Chitin - ✔✔Polymer-long chain of N-acetyl glucosamine (present inmost Arthropod
exoskeleton)
✔✔Resilin - ✔✔Rubbery protein for hinges, levers, membranes, wings, or legs to lighten
weight or provide bounce (ENABLE MOVEMENT)
✔✔Other outgrowths and ingrowths exist such as what? - ✔✔An example would be
warts, hairs, bumps, spines, spurs, and setae
✔✔What are the advantages? - ✔✔Lightweight, protective against acids, pathogens,
etc., protects against water loss
, ✔✔What are the disadvantages? - ✔✔Must molt in order to grow, makes vulnerable and
limits size that a terrestrial animal can become
✔✔What are the 2 functions of the head?* - ✔✔1. Take in food
2. Sense outside world
"The center for sensing and eating"
-Fusion of 6 segments into a hard capsule
- Appendages modifies to form mouthparts*
✔✔Compound eyes - ✔✔Form mosaic, more facets (hexagons) = higher resolution
-See color but different than humans (ex. cannot see red but can see ultraviolet) (violet,
blue, green, yellow)
-Can highly detect motion and polarization
✔✔Ocelli - ✔✔Simple eyes or single cells with a lens and a few nerves which can sense
light intensity and some movement (helps with circadian rhythm or shadows)
-No complex images
-Usually found on adult and larval insects but usually not on those who go through
complete metamorphosis
✔✔Antennae - ✔✔Always comes in pairs, and they have no muscles in the long parts,
most important sense organs.
-Increases surface area for chemoreception
-Many functions sense wind, touch, taste, hear, smell, and wind speed for flying
Made of:
-Scape - base
Pedicel- first segment
Flagellum- reaches
✔✔Mouth: (T/F) Some adults only mate and do not eat - ✔✔True
✔✔(T/F) Chewing mouthparts are the most primitive - ✔✔True
✔✔Layout of chewing mouthparts - ✔✔*The original layout with labrum, 2 mandibles, 2
maxillae, labium and hypo pharynx
1. Labrum: Upper lip - 2 fused appendages to keep food in
