An internal body cavity that is derived from the mesoderm of the triploblastic animals is known as coelom. Therefore, the presence of coelom is not the characteristics of all animals. All animals are heterotrophic, multicellular eukaryotic organisms. Animals have a basic structure and functional design of body. The structure and functional design of the animal body are adapted to its methods of lifestyle, food intake, and reproduction. Animals experience a period of embryonic development, where the zygote (a haploid sperm unites with a haploid egg to form diploid zygote) undergoes a series of mitotic cell divisions known as cleavage. Hence, option (e) is incorrect.
Typically, the first stage in animal development after zygote formation is a solid ball of cells called theA)blastulaB)morulaC)gastrulaD)planula
Other than Radiata, eumetazoans areA)ablastic (having no tissue layers)B)triploblasticC)monoblasticD)diploblastic
The eumetazoan phylum sometimes called "wheel animals" because of their feeding mechanism isA)PoriferaB)RotiferaC)NematodaD)Anthozoa
A class of cnidarians that lacks a medusa stage isA)HydrazoaB)CubazoaC)AnthozoaD)Scyphozoa
For excretion, flatworms useA)nephridiaB)flame cellsC)osmosisD)regurgitation
The nervous system of most flatworms can be correctly described asA)a nerve netB)a nerve ladderC)a nerve chordD)a nerve ringE)lacking
Cnidarian digestion isA)internal and extracellularB)internal and intracellularC)internal, extracellular and intracellularD)external and intracellularE)external, extracellular and intracellular
The largest phylum of pseudocoelomates isA)CycliophoraB)PlatyhelminthesC)CestodaD)NematodaE)Rotifera
Cnidarian larvae are known asA)planulaeB)cercariaeC)metacecariaeD)polypsE)medusae
Which of the following statements about nematocysts is incorrect?A)stings from nematocysts may be fatalB)the osmotic pressure of a nematocyst may exceed 100 atmospheresC)nematocysts turn inside out when firedD)nematocysts are used only by cnidariansE)nematocysts may occur on bodies of cnidarians as well as on their tentacles
The parasite that infects people who eat undercooked pork isA)ClonorchisB)SchistosomaC)TrichinellaD)CaenorhabditisE)Dugesia
Which of the following is characteristic of sponges?A)symmetryB)sexual reproductionC)tissuesD)organsE)adult mobility
In humans, the infective stage of the liver fluke is theA)sporocystB)rediaC)miracidiumD)metacercariaE)cercaria
Which of the following is not a characteristic found in cnidarians?A)tissuesB)symmetryC)sexual reproductionD)asexual reproductionE)organs
Which one of the following characteristics is found in cnidarians?A)organsB)respiratory systemC)blood vesselsD)specialized internal cavityE)nervous system
Tapeworms attach to the digestive lining of the host by means of theirA)proglottidsB)styletsC)osculumD)mastaxE)scolex
Water taken in through the pores in sponges exits through theA)mesogleaB)spiculesC)osculumD)gastrovascular cavityE)coelenteron
The planulae of _______________ develop only into polypsA)HydrozoaB)CtenophoraC)ScyphozoaD)CnidariaE)Anthozoa
The scyphozoa are called jellyfish because of theirA)mesodermB)mesogleaC)mesenchymeD)mesenteryE)pectin
Which of the following have a one-way digestive system?A)ctenophoransB)flukesC)tapewormsD)free living flatwormsE)cnidarians
Of the Eumetazoa listed below, the _______________ are generally considered the most primitive.A)ChordataB)RotiferaC)OnychophoraD)CtenophoraE)Pogonophora
The phylum of the simplest animal to have a blood filled circulatory system isA)AnnelidsB)NemerteaC)ArthropodaD)MolluscaE)Chordata
Which of the following phyla were discovered most recently?A)CycliophoraB)CnidariaC)PoriferaD)NematodaE)Platyhelminthes
The phylum of the simplest animals to possess a complete digestive system isA)NemerteaB)RotiferaC)OnycophoraD)CtenophoraE)Annelida
Sexually, most flatworms areA)parthenogenicB)asexualC)hermaphroditicD)amorphousE)aphrodisiac
Animals with the simplest tissue level of organization are:A)mesoblasticB)meroblasticC)monoblasticD)diploblasticE)triploblastic
Which term is incorrectly identified?A)planula -- hollow, ciliated ball of cellsB)proglottids -- repeating units of the body of a tapewormC)proboscis - a long muscular tube found in nemerteansD)flame cells -- protonephridia found in flatwormsE)mesentery -- peritoneum that forms a double layer of tissue surrounding and anchoring the digestive tract and associated organs
In vertebrates the blastopore becomes the anus, and during cleavage, the regulatory signal in the egg are evenly distributed in the cells. An invertebrate phylum sharing these characteristics is the:A)ArthropodaB)NematodaC)AnnelidaD)MolluscaE)Echinodermata
The sponges have all of the following characteristics except:A)highly specialized cellsB)simple tissuesC)a gel-like matrixD)cell recognitionE)complex multicellularity
The outer covering and nervous systems of eumetazoans develop from the:A)ectodermB)endodermC)mesodermD)a and cE)a, b, and c
Which one of the following is not a member of the phylum Cnidaria?A)jellyfishB)comb jellyC)hydraD)coralE)sea anemone
Cnidarians are:A)asymmetricalB)bilaterally symmetricalC)radially symmetricalD)trisymmetricalE)none of the above
A cnidocyte is a specialized cell used for:A)sensing lightB)digesting foodC)capturing foodD)sensing movementE)circulating water
Key evolutionary advances of the solid worms are bilateral symmetry and:A)a coelomB)internal organsC)a one-way digestive tractD)a body cavityE)a circulatory system
The free-swimming larval stage of cnidarians is the planulae.A)TrueB)False
The presence of collar cells in sponges suggests an evolutionary relationship between the sponges and ciliates.A)TrueB)False
Sponges belong to the subkingdom Eumetazoa.A)TrueB)False
A jellyfish is an example of a medusa body form.A)TrueB)False
Nematodes are animals with a body cavity between the endoderm and the mesoderm.A)TrueB)False
Solid worms are pseudocoelomates.A)TrueB)False
Which of the following is a characteristic of the phylum Platyhelminthes?
Characteristic features of Phylum Platyhelminthes. Their body is dorsoventrally flattened. They exhibit bilateral symmetry. Also, they are triploblastic, with three germ layers.
What are 5 characteristics of phylum Platyhelminthes?
Characteristics of Platyhelminthes
They may be free-living or parasites. The body has a soft covering with or without cilia. Their body is dorsoventrally flattened without any segments and appears like a leaf. They are devoid of the anus and circulatory system but have a mouth.
Which of the following is not correct for Platyhelminthes?
Answer: option d is the correct answer because only planaria possess high generation capacity and fasciola does not possess high generation capacity.
Which of the following is characteristic of the phylum Platyhelminthes quizlet?
Which of the following is characteristic of the phylum Platyhelminthes? They are dorsoventrally flattened. This is why they are also called flatworms.