NEM3002 UF Final Exam UPDATED ACTUAL
QUESTIONS AND CORRECT ANSWERS
Nematodes are roundworms. T or F - CORRECT ANSWER True
Which of the following are invertebrates?
- Earthworms
- Flatworms
- Nematodes
- Frogs - CORRECT ANSWER Earthworms, Flatworms, Nematodes
Where can nematodes be found? - CORRECT ANSWER As said in the lecture, treasure is
everywhere. Nematodes can be found in all marine, freshwater, and terrestrial environments (soil) and
are typically the most abundant invertebrate.
Nematodes are: - CORRECT ANSWER - pseudocoelomate, protosomes
What is phylogenetics and how is it done? - CORRECT ANSWER Phylogenetics is the study of
relationships between organisms and helps understand ancestry and descendants. Commonly done by
grouping organisms with their most recent common ancestor and other descendants based on genetics.
Nematodes embryogeny begins with the formation of the mouth from or near the blastopore. T or F -
CORRECT ANSWER True
If a nematode is isolated by spinning a water sample in a centrifuge, this is considered a passive
extraction. T or F - CORRECT ANSWER True
What is a benefit to the nematode body shape/size in a soil environment? - CORRECT
ANSWER They can fit into soil pores to find food that other organisms cannot.
Nematode diversity is greatest in the soil (if including plants and invertebrates within soil habitats) T
or F - CORRECT ANSWER True
, What is the number of molts in a nematode life cycle? - CORRECT ANSWER 4
what roles do nematodes play in soil ecology? - CORRECT ANSWER primary, secondary, and
tertiary consumers
Which nematode trophic group usually have a needle shaped mouth part called stylet?
- Herbivore
- Predator
- Fungivore
- Omnivore
- Bacteriovore - CORRECT ANSWER Herbivore, Fungivore
How do you extract nematodes from soil? - CORRECT ANSWER There are a few ways but
tools needed are very simple: a shovel, auger, t-tube, etc. An active method is to extract nematode
through the Baermann funnel where you fill the funnel with soil and water. Over time the method
takes about 24-72 hours and only live nematodes will sink to the bottom of the funnel. The passive
method is sieving and centrifuging, where the nematodes will clump at the bottom after the
centrifugation (dead or alive)
Which is the correct order of egg layer development? - CORRECT ANSWER vitelline, chitin,
lipid
This egg layer provides structural strength. - CORRECT ANSWER Chitin
This egg layer is impermeable. - CORRECT ANSWER Lipid
Can nematodes see light? - CORRECT ANSWER They have sensory structures although they
do not have eyes like humans and other mammals. The structures enhance the nematode's awareness
to the environment around them, so they don't require eyes to see light.
order the three steps of nematode molting - CORRECT ANSWER apolysis,
formation of new cuticle,
ecdysis
QUESTIONS AND CORRECT ANSWERS
Nematodes are roundworms. T or F - CORRECT ANSWER True
Which of the following are invertebrates?
- Earthworms
- Flatworms
- Nematodes
- Frogs - CORRECT ANSWER Earthworms, Flatworms, Nematodes
Where can nematodes be found? - CORRECT ANSWER As said in the lecture, treasure is
everywhere. Nematodes can be found in all marine, freshwater, and terrestrial environments (soil) and
are typically the most abundant invertebrate.
Nematodes are: - CORRECT ANSWER - pseudocoelomate, protosomes
What is phylogenetics and how is it done? - CORRECT ANSWER Phylogenetics is the study of
relationships between organisms and helps understand ancestry and descendants. Commonly done by
grouping organisms with their most recent common ancestor and other descendants based on genetics.
Nematodes embryogeny begins with the formation of the mouth from or near the blastopore. T or F -
CORRECT ANSWER True
If a nematode is isolated by spinning a water sample in a centrifuge, this is considered a passive
extraction. T or F - CORRECT ANSWER True
What is a benefit to the nematode body shape/size in a soil environment? - CORRECT
ANSWER They can fit into soil pores to find food that other organisms cannot.
Nematode diversity is greatest in the soil (if including plants and invertebrates within soil habitats) T
or F - CORRECT ANSWER True
, What is the number of molts in a nematode life cycle? - CORRECT ANSWER 4
what roles do nematodes play in soil ecology? - CORRECT ANSWER primary, secondary, and
tertiary consumers
Which nematode trophic group usually have a needle shaped mouth part called stylet?
- Herbivore
- Predator
- Fungivore
- Omnivore
- Bacteriovore - CORRECT ANSWER Herbivore, Fungivore
How do you extract nematodes from soil? - CORRECT ANSWER There are a few ways but
tools needed are very simple: a shovel, auger, t-tube, etc. An active method is to extract nematode
through the Baermann funnel where you fill the funnel with soil and water. Over time the method
takes about 24-72 hours and only live nematodes will sink to the bottom of the funnel. The passive
method is sieving and centrifuging, where the nematodes will clump at the bottom after the
centrifugation (dead or alive)
Which is the correct order of egg layer development? - CORRECT ANSWER vitelline, chitin,
lipid
This egg layer provides structural strength. - CORRECT ANSWER Chitin
This egg layer is impermeable. - CORRECT ANSWER Lipid
Can nematodes see light? - CORRECT ANSWER They have sensory structures although they
do not have eyes like humans and other mammals. The structures enhance the nematode's awareness
to the environment around them, so they don't require eyes to see light.
order the three steps of nematode molting - CORRECT ANSWER apolysis,
formation of new cuticle,
ecdysis
