The following points highlight the three types of symmetry in animals. The types are: 1. Spherical Symmetry 2. Radial Symmetry 3. Bilateral Symmetry. Type # 1. Spherical Symmetry: In this type of symmetry, the body of the individual can be divided into similar halves by any plane passing through the centre, e.g. Volvox, some sponges and some corals. Type # [...]
The following points highlight the fourteen types of organs found in animal body. The types are: 1. Digestive Tract 2. Digestion 3. Heterotrophic Mode of Nutrition 4. Active Movement 5. Blood Vascular System 6. Respiration 7. Lungs 8. Anaerobic Respiration 9. Excretion 10. Neural System 11. Receptors 12. Endocrine Glands 13. Skeleton 14. Notochord. Type # 1. Digestive Tract: Digestive [...]
The following points highlight the two types of germinal layers of the animals. The types are: 1. Segmentation 2. Development. Germinal Layers: Type # 1. Segmentation: Segmentation is division or differentiation of the body into distinct portions called segments. It is of two types: metameric segmentation and pseudo-metamerism. I. Metameric Segmentation (True metamerism or True segmentation): It is a type [...]