Section 27-2 Flashcards
Circle the letter of each sentence that is true about roundworms.
A) parasitic roundworms live in plants and in animals.
B) all roundworms are parasitic
C) some roundworms are a meter in length
D) all roundworms develop from three germ layers
A, C, D
A body cavity that is lined only partially with tissue derived from the mesoderm is called a ______
Pseudocoelom
How is a roundworm’s digestive tract like a tube-within-a-tube?
The inner tube is the digestive tract, and the outer tube is the body wall.
The posterior opening of the digestive tract is called the
Anus
Circle the letter of each feature that a roundworm has.
A) pseudocoelom
B) mouth
C) anups
D) coelom
A, B, C
Which have more complex body systems, free-living or parasitic roundworms?
Free living roundworms have a more complex body system.
True of false? Many free living roundworms are predators.
True
Roundworms exchange gases and excrete metabolic wastes through their
Body walls
What can roundworms’ sense organs detect?
They can detect chemicals that are given off by prey or hosts.
Do roundworms reproduce sexually or asexually?
Sexually
How do Trichinella roundworms cause pain in their hosts?
They cause pain by traveling through the bloodstream and burrowing into organs and tissues.
Trinchella
Caused by roundworms
Spreads by rats or pigs/raw or cooked
Filarial worms
Elephantiasis
Spreads by insect and mosquito bites
Ascarid worms
Human parasite (ascaris lumbricoides)
In soil/unprotected foot allows them to burrow in the skin and bloodstream.
What is elephantiasis?
elephantiasis is a condition in which a part of the body swells enormously. The swelling is caused by large numbers of filarial worms blocking the passages of fluids within the lymph vessels.
Circle the letter of each sentence that is true about the life cycle of Ascaris.
A) Larvae in the lungs are coughed up and swallowed.
B) The eggs develop into larvae in the lungs.
C) Fertilized eggs leave the host’s body in feces.
D) The host ingests Ascaris eggs in contaminated food or water.
A, C,
How are ascarid worms commonly spread?
Commonly spread by eating vegetables or food that hasn’t properly been washed.
Where do hookworm eggs hatch and develop?
They hatch and develop on the outside of the host and develop in the soil.
Circle the letter of each sentence that is true about C. elegans.
A) it’s a free living roundworm
B) it’s DNA was the first of an multicellular animals to be sequenced completely.
C) It feeds on rotting vegetation.
D) Its DNA has 30 times the number of base pairs that human DNA has.
A,B,C
What are proglottids?
Segments that make up the worms body. And they contain male and female reproductive structures
