Choose a set of organisms showing bilateral symmetry:

Spongilla, Hydra, Ascaris

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Sea fan, Sea cucumber, Cockroach

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Earthworm, Octopus, Balanoglossus

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Laccifer, Nereis, Ctenoplana

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Solution

The correct option is C Earthworm, Octopus, Balanoglossus
The organism with bilateral symmetry can be divided into two halves along both sides of a plane. However, the internal organs need not be distributed symmetrically. Animals with bilateral symmetry have a dorsal side, a ventral side, distinct left-right sides, and anterior-posterior sides. Examples include butterflies, Balanoglossus, flatworms, octopuses, crustaceans, spiders, sea stars, etc.
So the correct option is 'Earthworm, Octopus, Balanoglossus.'

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Humans display bilateral symmetry. Which of the following organisms show a similar pattern of symmetry?

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Question 40
Classify the following organisms based on the absence/presence of true coelom (i.e., acoelomate, pseudocoelomate and coelomate)
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