Meaning and Origin of Foot: Phylum Mollusca is characterised by the pronounced development of musculature known as the foot. It is the locomotory organ in Molluscs. This organ is quite uncommon and strange to others. It is regarded as the remnant of the 'dermo-muscular tube' of the ancestral form whose ventral side became greatly developed as an adaptation for creeping [...]
In this article we will discuss about Pearl:- 1. Meaning of Pearl 2. Chemical Composition of Pearls 3. Shape, Size and Colour 4. Formation 5. Species Used in Pearl Culture 6. Distribution of Pearl Oysters in Indian Waters 7. Pearl Fishery in Japan and Other Countries. Meaning of Pearl: Pearl is a spherical or irregular mass formed by the [...]
In this article we will discuss about Achatina:- 1. Distribution of Achatina 2. Habit and Habitat of Achatina 3. External Structures 4. Coelom 5. Digestive System 6. Locomotion 7. Respiratory System 8. Circulatory System 9. Excretory System 10. Nervous System 11. Reproductive System 12. Development. Contents: Distribution of Achatina Habit and Habitat of Achatina External Structures of Achatina Coelom of [...]