In this article we will discuss about Molluscs:- 1. General Characters of Molluscs 2. Classification of Molluscs 3. Economic Importance. General Characters of Molluscs: 1. Molluscs are essentially aquatic mostly marine, few freshwater and some terrestrial forms. 2. The body is soft, un-segmented, bilaterally symmetrical and consists of head, foot, mantle and visceral mass. 3. The body is clothed with [...]
In this article we will discuss about Unio:- 1. Habit and Habitat of Unio 2. External Features of Unio 3. Internal Structures 4. Coelom 5. Locomotion 6. Respiratory System 7. Digestive System 8. Blood Vascular 9. Excretory System 10. Nervous System 11. Sense Organs 12. Respiratory System 13. Fertilisation 14. Development 15. Metamorphosis. Contents: Habit and Habitat of Unio External [...]
Get the answer of: How is the Pearl Formed ? Pearl is a valuable gem known to mankind since ancient times. The pearl, in fact, is of animal origin and produced by certain bivalves of Mollusca. The pearl producing bivalves are marine oysters of the genus Pinctada, though some freshwater bivalves of the genus Unio and Anodonta also produce pearl [...]