All living things respond to changes Responsiveness is the act of sensing a stimulus and responding to it.
Autotrophic nutrition involves the use of an external energy source like sunlight, chlorophyll and raw materials to synthesize complex organic food by a process called photosynthesis All green plants and some green algae that have chlorophyll are called autotrophs.
Stomata are pores, which are present more in number in the lower epidermis of leaves and are used for gaseous exchange.
Chlorophyll consists of four types. They are chlorophyll a and b which are green. The other two are xanthophylls and carotene which are yellow and orange, respectively.
Parasitic organisms are those which live at an expense of a other organism, called the host. Eg: Liverfluke
Saliva contain an enzyme called salivary amylase or ptyalin, which acts on starch and converts it into simpler molecule called maltose.
The digestive system of most animals consists mainly of a long continuous tube called the alimentary canal or digestive tract.
Breathing involves inspiration and expiration.
The lungs are enclosed in a double layered membrane called pleura. The respiratory tract is lined internally with a mucous membrane.
The movement of air in and out of the lungs and the distribution of air within the lungs are referred to as ventilation of lungs.