WorksheetsAschelminthes
Total questions: 40
Worksheet time: 29mins
Acoelomates: Platyhelminthes
Pseudocoelomates: (a)
Which are benefits of having a coelom?
separate and efficient digestive and circulatory systems
fluid-filled cushion for support and locomotion
increased metabolic rates
faster regeneration of cells
The superphyla Lophotrochozoa undergo a larval stage which is common to all organisms under this clade. What do you call its larva?
(a)
True or False: Both superphylum Lophotrochozoa and Ecdysozoa are considered protostomes. Their blastopores formed into the mouth of the digestive system.
True
False
Superphylum Ecdysozoa is distinguished by this feature during its growth and development.
shedding
trochophore larvae
fully ciliated
has an intermediate host
Which phylum does not belong to Superphylum Lophotrochozoa?
Rotifera
Kinorhyncha
Gastrotricha
Rotifera
Which of the following phyla is the most ancestral on the phylogenetic tree?
Rotifera
Loricifera
Nematoda
Gastrotricha
The 7 phyla under Aschelminthes were hypothesized to be linked together due to their features: a pseudocoelom, a cuticle, a muscular pharynx, and adhesive glands, and also that they have a ____ origin.
monophyletic
polyphyletic
phyletic ulo mo sa systematics
paraphyletic
True or False: Aschelminthes have a pseudocoelom, which is a body cavity surrounded by both the endoderm and the mesoderm.
True
False
The body plan of Aschelminthes lacks this membrane that is found in more advanced animals, due to it not having a true coelom.
Peritoneal Linings
Epithelium
Body Cavity
Mucous Membrane
True or False: Because of the pseudocoel, the organs of Aschelminthes are suspended or floating free in the cavity.
True
False
Aschelminthes are known to grow, not in cell number, but in cell size. Thus, they grow through (a) , which is a condition where the number of cells remains constant.
True or False: Aschelminthes, similar to flatworms, can also regenerate body parts,
True
False
May anus ayhan ang aschelminthes? :'))
Huo
Wala diyapon
Huo tatlo kabilog
During molting or ecdysis, some Aschelminthes shed this outer layer that can bear spines, scales, etc.
(a)
This phylum is commonly referred to as the hairy bellies or hairybacks because it has cilia that are used for movement and is covered in cuticles.
Gastrotricha
Acanthocephala
Nematoda
Gnathostomulida
Similar to the ganglion of Platyhelminthes, Phylum Gastrotricha also has this nervous structure, which is bilobed, called (a) .
Why is Phylum Rotifera considered "wheel-bearers"?
It has spinning cilia called corona for catching prey.
Its nerve cords are arranged radially, permitting spinning movement.
During mating season, it forms a ring with its body to bear fertilized egg.
Rotifera has a special feature in its pharynx called mastax, which serves as its jaws. It contains a muscular organ called (a) for grinding food.
How do the cilia of rotifers beat? This sequential movement makes it appear rotational.
metachronally
counter-clockwise movement
perpendicularly
sychronously
In certain environments, finding a mate would be difficult for some species of Aschelminthes. Therefore, they have developed a mode of reproduction where an unfertilized egg can simply grow into a new organism. What do you call this?
(a)
Under Rotifera
Class Seisonidea - ectoparasites with greatly reduced corona
(a) - free living and may occupy extreme environments
Class Monogononta - sessile organisms with mictic and amictic females
Some species under Phylum Rotifera may withstand extremely harsh environments, through (a) , which may form cysts.
Differentiate Mictic from Amictic females in Class Monogononta.
Mictic - can be fertilized
Amictic - cannot be fertilized
Mictic - cannot be fertilized
Amictic - can be fertilized
Mictic - requires multiple males
Amictic - requires only one male
Mictic - females can cross-fertilize
Amictic - unable to reproduce
This phylum is characterized by its thorny or spiny head and it is composed of parasitic organisms of vertebrate guts.
(a)
What feature of the spiny-headed worms allows them to pierce and hold onto the host’s gut?
Stinger
Suckers
Proboscis
Strobila
Similar to Class Cestoda, spiny-headed worms also lack a digestive system. Hence, they directly absorb the host's nutrients through their syncytial epidermis. This feature also houses circulatory channels called ____.
Lacunar System
Coronal Epithelium
Blood Vessels
Proboscis
Acanthocephalans have four long tubular ____ that have hardened secretions for plugging their female counterpart's vagina.
cement glands
proboscis
ovarian balls
ligament sacs
Through the feces of the hosts of Phylum Acanthocephala, these eggs are released and ingested by the next host, where they grow into a cystacanth, its infective stage. What do you call these eggs? (Hint: It is in the name of the Phylum)
(a)
This phylum is considered sand or jaw worms. Its pharynx has paired jaws, it is an acoelomate, and it does not have an anus.
Gnathostomulida
Rotifera
Gastrotricha
Acanthocephala
This phylum is commonly called ribbon or proboscis worms. It has an eversible and retractable ectodermal proboscis. This phylum also has a true circulatory system due to its contractile blood vessels with no true heart.
(a)
By splitting the mesodermal tissue of a ribbon worm, a fluid-filled tubular cavity is formed where its proboscis floats in. What is the name of this cavity?
(a)
A proboscis may contain ____, which has a paralyzing toxin used for capturing prey.
Stylet
Cnidae
Rhyncho
Nemertea
The nervous system of Phylum Nematoda consists of the ganglion, a nerve ring, 4 longitudinal nerve cords, and which of the following sensory structures?
Papillae
Setae
Corona
Amphids
Ocelli
True or False: Phylum Nematoda has protonephridia similar to Platyhelminthes.
True
False
This phylum is known as mud dragons due to them growing on intertidal mud or sandy mud substrate. It possesses a retractile head, bearing circlet of spines, allowing it to burrow into mud.
(a)
According to the Phylogenetic Tree, this phylum under Superphylum Ecdysozoa is the most recent among all the other groups.
Loricifera
Priapulida
Kinorhyncha
Nematoda
Linking with the name of Phylum Loricifera, it has a shell-like protective outer covering called (a) .
A special characteristic of this phylum is the presence of a blood-red pigment called hemerythrin and its number of species only sums up to 16. What is the name of the phylum?
(a)
As added information, some sources say that Phylum Priapulida can actually be considered a coelomate due to its body cavity being lined by mesodermal tissue (Shapeero, 1961) (Ramel, 2020). However, even though it is a mesodermal lining, it looks different from that of coelomates (Bumblebee, n.d.)
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