Botany - Animal Kingdom Question with Solution | TestHub

Diploblasty is a condition of the blastula in which there are two primary germ layers: the ectoderm and endoderm. They do not show the mesodermal layer.

Roundworms, earthworms and liver fluke have bilateral symmetry.  These are elongated worm-like organisms.

Hydra is radially-symmetrical. The body of the organism can be divided into equal halves in any plane of the axis. The tentacles radiate outward around the mouth. These type of arrangement of the tentacles gives the organisms a radial form of symmetry.