NEM 3002 Final Exam QUESTIONS AND
CORRECT ANSWERS
What is a possible reason Ascaris produces so many more eggs than C. elegans in a day? - CORRECT
ANSWER Ascaris is a parasite and many eggs are likely to be killed by host immune system
If a nematode is isolated by spinning a water sample in a centrifuge, this is considered a passive
extraction. - 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 can't.
Nematode diversity is greatest in the soil (if including plants and invertebrates within soil habitats) -
CORRECT ANSWER True
What is the number of molts in a nematode life cycle? (Use a numeral to indicate your answer) -
CORRECT ANSWER 4
What roles do nematode play in soil ecology? - CORRECT ANSWER primary, secondary and
tertiary consumers
Which nematode trophic groups usually have a needle shaped mouth part called a stylet? - CORRECT
ANSWER Herbivore, Fungivore
How do you extract nematodes from soil? - CORRECT ANSWER You can extract nematodes
from the soil using two different methods. One is using the Baermann Funnel where the nematodes
have to actively move from the soil to the water. Another method is using a passive method such as
centrifugation.
Nematodes are roundworms - CORRECT ANSWER True
Which of the following are invertebrates? - CORRECT ANSWER Flatworms, Nematodes,
Earthworms
, Where can nematodes be found? - CORRECT ANSWER Nematodes are abundant in various
places such as marine, freshwater and terrestrial environments.
Nematodes are: - CORRECT ANSWER Pseudocoelomate, protosomes
What is phylogenetics and how is it done? - CORRECT ANSWER Phylogenetics is the study of
how organisms are related genetically throughout time. This is usually mapped in a tree format with
each delineation as a genetic event separating two related organisms. This is done by gene mapping
and figuring out the base pairing sequences between organisms. From there, similarities are matched
and differences help to show evolution of organisms throughout time.
Nematodes embryogeny begins with the formation of the mouth from or near the blastopore. -
CORRECT ANSWER True
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 Although nematodes do not see light, they do
have sensory organs/sensory system that can help them sense light.
Order the three steps of nematode molting - CORRECT ANSWER 1. Apolysis
2. Formation of a new cuticle
3.Ecdysis
Order the steps of nematode hatching - CORRECT ANSWER 1. Juvenile movement
2. Enzymatic breakdown of eggs
3. Change in egg permeability
CORRECT ANSWERS
What is a possible reason Ascaris produces so many more eggs than C. elegans in a day? - CORRECT
ANSWER Ascaris is a parasite and many eggs are likely to be killed by host immune system
If a nematode is isolated by spinning a water sample in a centrifuge, this is considered a passive
extraction. - 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 can't.
Nematode diversity is greatest in the soil (if including plants and invertebrates within soil habitats) -
CORRECT ANSWER True
What is the number of molts in a nematode life cycle? (Use a numeral to indicate your answer) -
CORRECT ANSWER 4
What roles do nematode play in soil ecology? - CORRECT ANSWER primary, secondary and
tertiary consumers
Which nematode trophic groups usually have a needle shaped mouth part called a stylet? - CORRECT
ANSWER Herbivore, Fungivore
How do you extract nematodes from soil? - CORRECT ANSWER You can extract nematodes
from the soil using two different methods. One is using the Baermann Funnel where the nematodes
have to actively move from the soil to the water. Another method is using a passive method such as
centrifugation.
Nematodes are roundworms - CORRECT ANSWER True
Which of the following are invertebrates? - CORRECT ANSWER Flatworms, Nematodes,
Earthworms
, Where can nematodes be found? - CORRECT ANSWER Nematodes are abundant in various
places such as marine, freshwater and terrestrial environments.
Nematodes are: - CORRECT ANSWER Pseudocoelomate, protosomes
What is phylogenetics and how is it done? - CORRECT ANSWER Phylogenetics is the study of
how organisms are related genetically throughout time. This is usually mapped in a tree format with
each delineation as a genetic event separating two related organisms. This is done by gene mapping
and figuring out the base pairing sequences between organisms. From there, similarities are matched
and differences help to show evolution of organisms throughout time.
Nematodes embryogeny begins with the formation of the mouth from or near the blastopore. -
CORRECT ANSWER True
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 Although nematodes do not see light, they do
have sensory organs/sensory system that can help them sense light.
Order the three steps of nematode molting - CORRECT ANSWER 1. Apolysis
2. Formation of a new cuticle
3.Ecdysis
Order the steps of nematode hatching - CORRECT ANSWER 1. Juvenile movement
2. Enzymatic breakdown of eggs
3. Change in egg permeability
