The following points highlight the five main parts that make up the internal structure of Hydra. The parts are: 1. Body Wall 2. Epidermis 3. Gastrodermis 4. Mesogloea 5. Gastro vascular cavity. 1. Body Wall: The body wall consists of two cellular layers, an outer epidermis derived from ectoderm and an inner gastro dermis derived from endoderm. In between the [...]
Habit and Habitat of Obelia: Obelia is sedentary, marine colonial form found attached on the surface of sea weeds, molluscan shells, rocks and wooden piles in shallow water up to 80 metres in depth. Obelia is cosmopolitan in distribution, forming a whitish or light-brown plant-like fur in the sea; hence, the common name sea-fur is assigned to it. Obelia Colony [...]
In this article we will discuss about Hydra:- 1. History of Hydra 2. Habit, Habitat and Culture of Hydra 3. Structure 4. Locomotion 5. Nutrition 6. Respiration, Excretion and Osmoregulation 7. Nervous System 8. Behaviour 9. Reproduction 10. Regeneration 11. Immortality 12. Symbiosis 13. Physiological Division of Labour. Contents: History of Hydra Habit, Habitat and Culture of Hydra Structure of [...]