Question

Which of the following pairs is an incorrect match?

• A. Annelids and arthropods-Bilateral symmetry
• B. Sponges-Acoelomates
• C. Coelenterates and Ctenophores-Radial symmetry
• D. Platyhelminthes-Diploblastic organisation

Answer 1

The Correct Option is D

To determine the incorrect match among the pairs provided, we need to understand some basic biological concepts related to the organization and symmetry of various animal groups.

1. Annelids and arthropods - Bilateral symmetry: Annelids (e.g., earthworms) and arthropods (e.g., insects, spiders) both exhibit bilateral symmetry, where the body can be divided into two equal halves on a single plane. Therefore, this match is correct.
2. Sponges - Acoelomates: Sponges are simple animals with a porous body design and are indeed acoelomates, meaning they do not have a coelomic cavity. Thus, this match is correct.
3. Coelenterates and Ctenophores - Radial symmetry: Coelenterates (Cnidarians, like jellyfish) and Ctenophores (comb jellies) typically have radial symmetry, which means their body can be divided into similar halves through several planes passing through the central axis. Therefore, this match is correct.
4. Platyhelminthes - Diploblastic organization: Platyhelminthes, or flatworms, are actually triploblastic, meaning they develop from three embryonic germ layers (ectoderm, mesoderm, and endoderm), not the two (ectoderm and endoderm), which is characteristic of diploblastic organisms. Thus, this match is incorrect.

Based on the explanations above, the incorrect match is Platyhelminthes - Diploblastic organization.