alleryStart learning →Water leaves the body of a sponge through which opening?
- Ostium
- Cloaca
- Osculum
- Hypostome
Show answer and solution
Correct answer: C. Osculum
Water enters by many small ostia and is expelled from the spongocoel through the single osculum.
AP EAMCET Zoology Unit 3: Animal Diversity-I: Invertebrate Phyla — practice questions
Explore 74 free Zoology Unit 3: Animal Diversity-I: Invertebrate Phyla questions in AP EAMCET Biology. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 1–30 of 74.
Water leaves the body of a sponge through which opening?Read the answer and worked solution →Which cells line the spongocoel and canals of a sponge?Read the answer and worked solution →What type of digestion occurs in sponges?Read the answer and worked solution →A sponge skeleton is made of which structures?Read the answer and worked solution →Which level of body organisation do sponges show?Read the answer and worked solution →Which one of these is a freshwater sponge?Read the answer and worked solution →Euspongia is commonly known as which sponge?Read the answer and worked solution →Which statement about sponge sexuality is correct?Read the answer and worked solution →Which phylum has cnidoblasts bearing stinging capsules?Read the answer and worked solution →The stinging capsules of cnidarians are called what?Read the answer and worked solution →Cnidarians show which level of body organisation?Read the answer and worked solution →What are the two basic body forms of cnidarians?Read the answer and worked solution →Which cnidarian is a free-swimming, umbrella-shaped medusa?Read the answer and worked solution →Which cnidarian is used as an example of metagenesis?Read the answer and worked solution →The Portuguese man-of-war is which genus?Read the answer and worked solution →Meandrina is commonly called what?Read the answer and worked solution →The mouth of a cnidarian is borne on which structure?Read the answer and worked solution →Of what is the coral skeleton made?Read the answer and worked solution →Comb jellies are classified in which phylum?Read the answer and worked solution →How many external rows of comb plates does a ctenophore bear?Read the answer and worked solution →Which property is well marked in ctenophores?Read the answer and worked solution →Fertilisation in ctenophores is of which type?Read the answer and worked solution →Pleurobrachia is an example of which group?Read the answer and worked solution →Why are Platyhelminthes called flatworms?Read the answer and worked solution →Which cells help flatworms in osmoregulation and excretion?Read the answer and worked solution →Which body cavity condition do flatworms show?Read the answer and worked solution →Which flatworm has a high regeneration capacity?Read the answer and worked solution →The liver fluke belongs to which genus?Read the answer and worked solution →Which structures help parasitic flatworms attach to a host?Read the answer and worked solution →The roundworms are grouped in which phylum?Read the answer and worked solution →
Worked practice questions
Which cells line the spongocoel and canals of a sponge?
- Nephridia
- Flame cells
- Choanocytes
- Cnidoblasts
Show answer and solution
Correct answer: C. Choanocytes
Choanocytes, also called collar cells, line the spongocoel and canals and drive the water current.
What type of digestion occurs in sponges?
- Extracellular only
- Within a gut cavity
- Through body wall
- Intracellular mode
Show answer and solution
Correct answer: D. Intracellular mode
Sponges lack a digestive tract, so food is digested inside individual cells.
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