Hydra Organism Diagram. The body wall consists of two cellular layers an outer epidermis derived from ectoderm and an inner gastro dermis derived from endoderm. Asexual reproduction ie budding.
A closer look however reveals a mouth opening at the top pole of the organism surrounded by tentacles a peduncle as well as a basal disk through which the organism attaches to the substrate. Budding in hydra involves a small bud which is developed from its parent hydra through the repeated mitotic division of its cells. The developed bud starts to grow in size by receiving nutrients from the parents body.
Hydra have been extensively used for studying the teratogenic and toxic potential of numerous toxins throughout the years and are more recently growing in popularity to assess the impacts of environmental pollutants.
The body structure of hydra a single hydra is composed of 50000 to 100000 cells. The below mentioned article provides a study note on the locomotion in hydra. Growth starts with the development of the mouth and small tentacles. The body wall consists of two cellular layers an outer epidermis derived from ectoderm and an inner gastro dermis derived from endoderm.