ENT 101 MIDTERM 1 EXAM WITH
CORRECT QUESTIONS AND ANSWERS
2025
insect represent what percent of all known species - CORRECT-ANSWERSover 50%
vertebrates - CORRECT-ANSWERShave an internal skeleton (endoskeleton) with vertebrae
arranged into a spinal column
invertebrates - CORRECT-ANSWERSno vertebrae (no internal support structure) they have
support outside their body (exoskeleton)
two functions of the vertebral column - CORRECT-ANSWERS1. provides support against
gravity
2. allows for large body sizes
vertebrate animals (5) - CORRECT-ANSWERS1. amphibians
2. fish
,3. reptiles
4. birds
5. mammals
more than 90% of all species are what - CORRECT-ANSWERSinvertebrates
most recognized species of invertebrates - CORRECT-ANSWERSarthropods
arthron - CORRECT-ANSWERSjoint
podos - CORRECT-ANSWERSfeet
arthropod means what - CORRECT-ANSWERSjointed appendages
two functions of jointed appendages - CORRECT-ANSWERS1. locomotion
2. modified for different structures (antennae, mouth parts, reproductive structures)
how many known species of arthropods are there - CORRECT-ANSWERSabout 1.2 million
arthropods include what groups (6) - CORRECT-ANSWERS1. crabs
2. lobsters
,3. spiders
4. scorpion
5. millipedes
6. centipedes
7. insects
5 characteristics of arthropods - CORRECT-ANSWERS1. bilateral symmetry
2. segmented bodies
3. ventral nerve cords
4. dorsal blood vessels
5. exoskeletons
bilateral symmetry - CORRECT-ANSWERSsplit along the anterior-posterior axis (forming a
single plane of symmetry, separating into left and right sides)
jellyfish almost have perfect of what type of symmetry - CORRECT-ANSWERSradial
, 3 main body axis - CORRECT-ANSWERS1. dorsal/ventral
2. anterior/posterior
3. lateral
dorsal ventral axis - CORRECT-ANSWERSfrom top to bottom
anterior posterior axis - CORRECT-ANSWERSfrom front to back
lateral axis - CORRECT-ANSWERSfrom one side to another
segmented body - CORRECT-ANSWERSfused into regions/tagmata with different biological
functions
ventral nerve cord of arthropods is not enclosed in what - CORRECT-ANSWERSa protective
spinal column
what type of nerve cord do humans have - CORRECT-ANSWERSdorsal
what kind of circulatory system do humans have - CORRECT-ANSWERSclosed
CORRECT QUESTIONS AND ANSWERS
2025
insect represent what percent of all known species - CORRECT-ANSWERSover 50%
vertebrates - CORRECT-ANSWERShave an internal skeleton (endoskeleton) with vertebrae
arranged into a spinal column
invertebrates - CORRECT-ANSWERSno vertebrae (no internal support structure) they have
support outside their body (exoskeleton)
two functions of the vertebral column - CORRECT-ANSWERS1. provides support against
gravity
2. allows for large body sizes
vertebrate animals (5) - CORRECT-ANSWERS1. amphibians
2. fish
,3. reptiles
4. birds
5. mammals
more than 90% of all species are what - CORRECT-ANSWERSinvertebrates
most recognized species of invertebrates - CORRECT-ANSWERSarthropods
arthron - CORRECT-ANSWERSjoint
podos - CORRECT-ANSWERSfeet
arthropod means what - CORRECT-ANSWERSjointed appendages
two functions of jointed appendages - CORRECT-ANSWERS1. locomotion
2. modified for different structures (antennae, mouth parts, reproductive structures)
how many known species of arthropods are there - CORRECT-ANSWERSabout 1.2 million
arthropods include what groups (6) - CORRECT-ANSWERS1. crabs
2. lobsters
,3. spiders
4. scorpion
5. millipedes
6. centipedes
7. insects
5 characteristics of arthropods - CORRECT-ANSWERS1. bilateral symmetry
2. segmented bodies
3. ventral nerve cords
4. dorsal blood vessels
5. exoskeletons
bilateral symmetry - CORRECT-ANSWERSsplit along the anterior-posterior axis (forming a
single plane of symmetry, separating into left and right sides)
jellyfish almost have perfect of what type of symmetry - CORRECT-ANSWERSradial
, 3 main body axis - CORRECT-ANSWERS1. dorsal/ventral
2. anterior/posterior
3. lateral
dorsal ventral axis - CORRECT-ANSWERSfrom top to bottom
anterior posterior axis - CORRECT-ANSWERSfrom front to back
lateral axis - CORRECT-ANSWERSfrom one side to another
segmented body - CORRECT-ANSWERSfused into regions/tagmata with different biological
functions
ventral nerve cord of arthropods is not enclosed in what - CORRECT-ANSWERSa protective
spinal column
what type of nerve cord do humans have - CORRECT-ANSWERSdorsal
what kind of circulatory system do humans have - CORRECT-ANSWERSclosed
