How are a roundworm's muscles arranged in its body?
>> B) Lengthwise
D) Around the pseudocoelom
How does a pseudocoelom differ from a coelom?
A) A pseudocoelom is not filled with fluid.
B) A coelom is not filled with fluid.
>> C) A pseudocoelom is not completely lined by muscle.
D) A coelom is not completely lined by muscle.
Which is the correct life cycle for most roundworms?
>> D) Egg-larva-adult
What must a roundworm do if it is to grow larger?
>> A) Shed its cuticle
B) Develop a pseudocoelom
C) Develop crosswise muscles
D) Develop a circulatory system
What is an identifying characteristic of annelids?
A) A radula
>> B) Body segmentation
C) Larval stage in the life cycle
D) One heart
Why don't tapeworms need a digestive system?
A) They digest food outside their body.
B) They make their own food.
>> C) They absorb food that has already been digested by the host.
D) They do not need nutrients during most of their life cycle
What is the function of the hemocoel in mollusks?
>> D) Blood circulation
What distinguishes a mollusk's digestive tract?
A) It digests food in batches.
B) It allows the animal to eat a more varied diet.
C) Food can move in both directions through the digestive tract.
>> D) It has two openings – a mouth and an anus.
How are planarians, flukes, and tapeworms similar?
A) They are all parasites.
B) They take in oxygen through their pharynx.
>> C) They have a solid body, incomplete or absent gut, and no circulatory system.
D) They all take in food through their mouth.
Which of the following roundworms is not a parasite of humans?
C) Guinea worm
>> D) Annelid worm