Animals belonging to Acoela are protostomes with one body opening True False

Animals belonging to Acoela are protostomes with one body opening

True

False

Expert Solution

Answer) False

Explanation- Based on body cavity, animals are classified into three categories such as acoelomates, pseudocoelomates and coelomates.

Acoelomates - do not have a coelom or body cavity. Example- acoela, flukes, flatworms

Pseudocoelomates - have a body cavity but it does not develop from splitting of the mesoderm embryonic tissue layer. (so they possess a false coelom) Example- roundworms

Coelomates - have a body cavity (a true body cavity) lined with mesoderm cells. Example- humans, fishes etc

Animals with true coelom, that is, coelomates falls into two categories namely protostomes and deuterostomes, depending on how their embryos develop. In protostomes the mouth is developed first from the blastopore where as in deuterostomes the organ for excretion is formed first from the blastopore and mouth is formed second from another opening.

Acoela are tiny worm-like sea animals with either a simple mouth or none at all. They do not have a coelom, digestive tract or no system for eliminating the waste products. They are neither protostomes nor deuterostomes. But some studies found that acoelomorpha have a sequence of microRNA which is exclusive to deuterostomia, so they would be deuterostomes. But they could not prove this, because there is a chance that this microRNA might not be exclusive to deuterostomes but present in other forms too. Hence, the answer of this question is option two-false.

gladiator answered 1 year ago

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