Bio-topics

An ecosystem is the relationship between biotic and abiotic factor of our environment. The term Ecosystem was coined by Tansley. Component of ecosystem are biotic component and abiotic component. Biotic components are living components of an ecosystem and include producers, consumers and decomposers. Producers are those biotic components which can make their food themselves.   All the plants are considered as producers because they can make food in the form of organic material by using carbon dioxide and water in the presence of sunlight during biological process of photosynthesis.  Consumers are the components of ecosystem that depend on plant for food directly or indirectly. Primary consumers are herbivore animals which take food directly from plants for example goat, deer, elephant, cow rabbit etc. Secondary consumers are those animals which can take food killing the primary consumers or from the body of primary consumers like wolf, fox,frog, etc. Tertiary consum...

Alimentary canal is complete as it starts from mouth and ends with anus.  Alimentary canal has following parts-     Mouth:  It is a main opening of alimentary canal and guarded with lips. Mouth opens in a cavity i.e. buccal cavity.  Buccal cavity:  This is also known as  oral cavity or mouth cavity and it is a space between our cheeks. The roof of buccal cavity is made by palate while tongue is present at floor. Buccal cavity is also bounded by jaws in front. Upper jaw is fixed while lower jaw is movable. Jaws contain teeth for mastication of food .   Teeth:  Teeth are used for grinding and mastication of food inside the buccal cavity. Teeth of human beings are “ Diphyodont (appears two times in life),Thecodont(fixed in gums)and Heterodont (different types of teeth according to function)” . We have four types teeth in our buccal cavity i.e. Incisors,Canine Premolar and Molar. - Incisors -These te...