NEW
Font size
WorksheetsThe Phylum Annelida
Total questions: 71
Worksheet time: 36mins
What does the phylum Annelida consist of?
Flatworms
Segmented worms
Roundworms
Mollusks
The segmented worms may live in which of the following environments?
Only fresh water
Only salt water
Only on land
Fresh water, salt water, or on land
The Phylum Annelida consists of three classes. Name them.
Class Oligochaeta, Class Polychaeta, Class Hirudinea
Class Insecta, Class Arachnida, Class Crustacea
Class Gastropoda, Class Bivalvia, Class Cephalopoda
Class Mammalia, Class Reptilia, Class Amphibia
The term "annelid" means ________.
little rings
soft body
many legs
spiny skin
How many species are there in the phylum Annelida?
About 15,000 species
About 1,500 species
About 50,000 species
About 100,000 species
Which of the following is NOT a characteristic of all annelids?
Bilateral symmetry
Segmentation
No germ layers
True coelom lined with mesoderm tissue
Annelids have a tube-within-a-tube digestive tract that food passes through from the mouth to the anus.
True
False
What is one distinct advantage of the coelom of annelids being partitioned into compartments?
It allows different parts of the body to contract or expand independently of one another.
It increases the rate of photosynthesis in the organism.
It enables the organism to fly.
It allows the organism to survive without water.
Most annelids have body structures called setae and parapodia. What are setae?
Setae are external bristles used for movement.
Setae are internal organs for digestion.
Setae are sensory organs for detecting light.
Setae are glands that secrete mucus.
What is the basis for dividing annelids into three classes?
The number of setae and the presence or absence of parapodia.
The type of circulatory system present.
The mode of reproduction.
The habitat in which they live.
Which class of annelids generally live in the soil or in fresh water?
Class Oligochaeta
Class Polychaeta
Class Hirudinea
Class Archiannelida
True or False: The worms in the class Oligochaeta have parapodia.
True
False
The earthworm is divided into over ____ segments.
100
20
50
200
The first body segment in an earthworm is called the ____
prostomium
clitellum
setae
peristomium
The anus is found at the ____ segment and is for the elimination of digestive wastes.
last
first
middle
anterior
The clitellum contains ____ structures.
reproductive
digestive
respiratory
excretory
The cuticle covers the body and prevents ____ loss. It enables gases to diffuse through the skin.
water
heat
oxygen
salt
Which of the following statements about setae is NOT true?
Found on every segment except the first and last segments
There are 4 pairs per segment
They are used for movement
They are found only on the clitellum
Circular and longitudinal muscles line the ____ body wall of the earthworm.
interior
exterior
dorsal
ventral
The setae are used to ____ the worm in the ground.
anchor
feed
see
hear
Circular muscles contract making the earthworm _____
longer
shorter
thicker
drier
Longitudinal muscles contract making the earthworm _____
shorter
longer
thicker
slower
According to the passage, what is the function of the gizzard in the earthworm's digestive system?
It stores food temporarily
It grinds the soil, releasing and breaking up organic matter
It absorbs nutrients
It eliminates waste
The earthworm has a _______ circulatory system.
closed
open
single
double
What does a closed circulatory system mean?
The blood is not contained within blood vessels.
The blood is contained within a system of blood vessels.
The blood is only in the heart.
The blood is in the coelom.
An open circulatory system means that the blood is not entirely contained within _______.
blood vessels
the heart
capillaries
arteries
Where is the closed circulatory system found in annelids?
In the coelom
In the skin
In the blood vessels
In the nephridia
An earthworm circulatory system consists of a dorsal blood vessel, a ventral blood vessel, and _______ pairs of aortic arches.
five
three
seven
nine
What does the ventral blood vessel do in the earthworm?
Returns blood to the anterior end
Takes blood to the posterior end
Pumps blood to the skin
Stores nutrients
The dorsal blood vessel returns blood to the _______ end.
anterior
posterior
lateral
ventral
What is the function of the aortic arches in the earthworm?
Store blood
Link the dorsal and ventral blood vessels
Produce sperm
Excrete waste
The respiratory system of the earthworm has no specialized _______.
organs
cells
glands
tissues
How do oxygen and carbon dioxide diffuse in earthworms?
Through lungs
Through gills
Directly through the skin
Through spiracles
The skin must remain _______ for the diffusion of gases to occur in earthworms.
moist
dry
rough
scaly
What are nephridia in earthworms?
Blood vessels
Excretory tubules
Nerve cells
Reproductive organs
The nervous system of the earthworm consists of several _______ and a ventral nerve cord.
ganglia
hearts
segments
setae
What is a ganglion?
A mass of muscle tissue
A mass of nervous tissue that serves as a primitive brain
A blood vessel
An excretory organ.
Most body segments contain a single _______. In the anterior end, several ganglia are fused together to form a brain.
ganglion
neuron
artery
muscle
What does the anterior brain of the earthworm process information from?
Only light
Only touch
Simple stimuli such as light, touch, chemicals, moisture, temperature, and vibrations
Only temperature
Earthworms are hermaphroditic, meaning a single worm has both male and female reproductive organs.
True
False
Sperm is produced in the _______ and stored in the seminal vesicles.
testes
prostate gland
urethra
vas deferens
How does mating occur in earthworms?
By external fertilization
When two worms fuse their bodies together at the clitellum
By budding
By splitting
After exchanging sperm, the exchanged sperm moves into the _______ where it is stored.
seminal receptacle
oviduct
clitellum
vas deferens
How does the exchange of sperm occur in earthworms?
Through the skin
Through the sperm ducts
Through the nephridia
Through the blood vessels
After several days, the clitellum of each worm secretes a tube made of _______ and a tough carbohydrate known as chitin.
mucus
keratin
collagen
cellulose
Where does fertilization of the eggs occur in earthworms?
In the soil
In the seminal vesicle
In the tube secreted by the clitellum
In the nephridia
The young worms develop in the protective case for _______ to _______ weeks before they hatch.
two, three
one, two
four, five
five, six
What does the term 'polychaete' mean?
Many bristles
Single shell
No backbone
Large eyes
Polychaetes are marine annelids that have paired, paddlelike appendages tipped with what?
Setae
Tentacles
Claws
Fins
About what fraction of all annelids are polychaetes?
About 2/3rds
About 1/4th
About 1/2
About 3/4ths
How do polychaetes differ from other worms?
They have antennae and specialized mouthparts.
They lack any form of segmentation.
They have a hard exoskeleton.
They reproduce only asexually.
Where do most polychaetes live?
In marine habitats
In freshwater lakes
In deserts
On mountain tops
Many aquatic annelids breathe through what specialized organ?
Gills
Lungs
Tracheae
Book lungs
What is the smallest class of annelids?
Hirudinea (leeches)
Polychaeta (bristle worms)
Oligochaeta (earthworms)
Archianellida
Most leeches live in what type of environment?
Calm bodies of fresh water
Deserts
Mountain peaks
Saltwater oceans
Leeches are external parasites that suck the blood and body fluids of their host.
True
False
Do leeches have setae?
No
Yes, they have many setae
Only juvenile leeches have setae
They have setae only on their head
What is at the end of a leech's body that helps it attach to surfaces?
A sucker
A fin
A claw
A tentacle
Leeches secrete an anesthetic to prevent the host from feeling their presence.
True
False
Leeches are used for medicinal purposes. Name one use.
To suck out blood clots from a wound, promote circulation, or relieve pressure in a joint or wound.
To increase body temperature rapidly.
To improve eyesight instantly.
To cure all types of infections immediately.
How do annelids help aerate soil?
By burrowing through soil, mixing it to depths of 2 meters, and providing passageways for plant roots and water.
By absorbing nutrients from the air and releasing them into the soil.
By producing flowers that attract pollinators to the soil surface.
By photosynthesizing and increasing soil oxygen levels.
What is the benefit of plant matter passing through the worm gut?
It fertilizes the soil with earthworm castings rich in nutrients and beneficial bacteria.
It causes the soil to become more acidic and less fertile.
It removes all nutrients from the soil, making it barren.
It attracts harmful pests to the garden.
Earthworms are an important part of food chains. Name one animal that eats earthworms.
Birds
Grass
Rocks
Leaves
Marine annelids produce larvae that are consumed by what?
Fish
Plants
Insects
Birds
What five characteristics are shared by all annelids?
1. Bilateral symmetry 2. Segmentation 3. Three germ layers: Endoderm, ectoderm, and mesoderm. 4. A true coelom lined with mesoderm tissue. 5. A tube-within-a-tube digestive tract that food passes through from the mouth to the anus.
1. Radial symmetry 2. No segmentation 3. Two germ layers: Endoderm and ectoderm. 4. No coelom. 5. A sac-like digestive system.
1. Bilateral symmetry 2. No segmentation 3. Three germ layers: Endoderm, ectoderm, and mesoderm. 4. A pseudocoelom. 5. A gastrovascular cavity.
1. Asymmetry 2. Segmentation 3. Two germ layers: Endoderm and ectoderm. 4. A true coelom lined with ectoderm tissue. 5. A tube-within-a-tube digestive tract.
The coelom differs in the three phyla of worms in which of the following ways?
Platyhelminthes lack a coelom, Nematoda have a pseudocoelom, and Annelida have a true coelom.
All three phyla have a true coelom.
Platyhelminthes and Nematoda have a true coelom, Annelida lack a coelom.
Nematoda and Annelida lack a coelom, Platyhelminthes have a true coelom.
The advantages of a segmented body include:
Greater flexibility and mobility
Reduced ability to move
Decreased specialization of body parts
Limited growth potential
Polychaetes differ from earthworms in that they have:
parapodia and many bristles
a clitellum for reproduction
no segmentation
a slimy, unsegmented body
Some leeches are adapted to a parasitic way of life by:
having suckers to attach to hosts and suck blood
having wings to fly between hosts
producing venom to paralyze prey
using camouflage to avoid predators
Parasitic leeches are different from other parasitic worms such as tapeworms and liver flukes because:
Leeches have suckers and feed on blood externally, while tapeworms and liver flukes live inside the host's body and absorb nutrients.
Leeches live inside the intestines like tapeworms and absorb nutrients through their skin.
Leeches and tapeworms both attach to the liver and feed on bile.
Leeches reproduce inside the host's digestive tract like liver flukes.
Earthworms require a moist environment because:
they need moisture for gas exchange through their skin.
they use moisture to find food.
they need moisture to move quickly.
they use moisture to reproduce.
