Bilaterally symmetrical and acoelomate animals are exemplified by
- Platyhelminthes
- Aschelminthes
- Annelida
- Ctenophora
Answer
(1) Platyhelminthes
Solution
As per NCERT, Platyhelminthes (flatworms) are bilaterally symmetrical, triploblastic and acoelomate animals with organ level of organisation.
Aschelminthes are pseudocoelomates.
Annelida are coelomates (true coelom).
Ctenophora are radially symmetrical and diploblastic.
Bilateral symmetry with no body cavity is shown by Platyhelminthes.
Answer: (1)