Which of the following has a gastrovascular cavity?a) Earthwormb) Flatwormc) Nematode wormd) Round worm

Answer

The organism that possesses a gastrovascular cavity among the given options is:

b) Flatworm

Explanation

Flatworms, which belong to the phylum Platyhelminthes, have a simple body structure that includes a gastrovascular cavity. This cavity serves both digestive and circulatory functions, allowing for the distribution of nutrients throughout the body. In contrast, earthworms (annelids) have a complete digestive system, nematodes (roundworms) have a pseudocoelom, and roundworms (which are also nematodes) do not have a gastrovascular cavity.

Flatworms are known for their flat bodies and can often be found in aquatic or moist environments, utilizing the gastrovascular cavity for their digestion and nutrient absorption.