In contrast to annelids the platyhelminths show
- radial symmetry
- presence of pseudocoel
- bilateral symmetry
- absence of body cavity
The Correct Option is D
Solution and Explanation
Flatworms, also known as Platyhelminthes, do not possess a body cavity apart from the digestive tract, and they also lack an anus. In contrast, annelids have a fluid-filled cavity situated between the outer body wall and the digestive tract, which is known as a coelom.
So, the correct option is (D): absence of body cavity
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Concepts Used:
Animal Kingdom
Animals are eukaryotic, multicellular species that belong to the Kingdom Animalia. Every animal has a distinct characteristic. They get energy either by feeding on plants or on other animals. There are millions of species that have been recognized, few shares similar characteristics while others vary drastically.
Kingdom Animalia comprises all animals. In the midst of the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. Though, like plants, they do not possess chlorophyll or a cell wall. Therefore, members of the animal kingdom indicate a heterotrophic mode of nutrition. Kingdom Animalia is further classified into ten different subphyla based on their body designs or differentiations.
The different phyla of the Kingdom Animalia are as follows:
- Porifera
- Coelenterata (Cnidaria)
- Platyhelminthes
- Nematoda
- Annelida
- Arthropoda
- Mollusca
- Echinodermata
- Hemichordata
- Chordata
Read More: Classification of Animal Kingdom