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Question

Which of the following phyla of Kingdom Animalia are triploblastic in nature and have bilateral symmetry?
  1. Coelenterata
  2. Platyhelminthes
  3. Nematoda
  4. Annelida


Solution

The correct options are
B Platyhelminthes
C Nematoda
D Annelida
Among the following, platyhelminthes, nematodes and annelids are bilaterally symmetrical. According to which their body can be divided into two equal halves by a single plane passing through their body. Organisms belonging to these phyla are triploblastic as well, which means they have all the germ layers (ectoderm, endoderm and mesoderm). Coelentrates, on the other hand are radially symmetrical, i.e., the body of the individual can be divided into two equal halves by any plane passing through the centre. These organisms are diploblastic which means they have two germinal layers (ectoderm and endoderm)

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