The below mentioned article provides notes on animal cells. According to the cell theory animals are composed of cells and of cell products. The cell is the structural and functional unit of the animal body and the branch of Zoology which deals with cells is known as cytology. In unicellular animals the cell and the organism are one, whereas in [...]
The below mentioned article provides notes on Columba Livia. Columba livia is the scientific name of common pigeon (Fig. 143). It belongs to the class Aves which includes all the birds of the world. Most birds can fly in air. This peculiar habit has rendered certain changes in them, which are regarded as their characteristics. Some of these features are [...]
The below mentioned article provides notes on Mollusca (snail). The molluscs (mollis = soft) are soft-bodied animals with a hard external or internal shell. The phylum includes forms like chitons, snails, slugs, clams, oysters, sepia, loligo, octopus, etc. Generally aquatic, some terrestrial and amphibious forms are also present. In Mollusca A muscular foot is present as the thickening of the [...]