**2. Secondary metabolites**

Secondary metabolites can be found in abundance in plants. They are the focus of several research since they have a wide range of biological actions. Scientific reports have demonstrated the medicinal value of various parts of plant species (*C. odorata*, *C. oblongifolius*, *T. cordifolia*, *M. malabathricum*, and *D. bulbifera*) against a wide range of human ailments. Only the cytotoxicity of various secondary metabolites from different plant species will be discussed in this study.
