Q.Give one example each of a free-living and a parasitic member of phylum Platyhelminthes.

Step 1. Platyhelminthes includes both free-living forms, which are mostly aquatic, and parasitic forms, which live in or on other animals.

Step 2. Planaria is the standard free-living example, well known for its powers of regeneration.

Step 3. Fasciola (the liver fluke) and Taenia (the tapeworm) are the standard parasitic examples, both showing hooks/suckers for attachment to the host.

Recall one named free-living and one named parasitic flatworm from the chapter's example list.

• Naming a roundworm (e.g. Ascaris) instead of a flatworm — Ascaris belongs to Aschelminthes, a different phylum.
• Giving only a general answer ('a worm') instead of the specific genus name expected at this level.