The definition of a churn is a device for making butter. An example of a churn is what the Amish use to make butter. verb. To churn is defined as to stir or shake milk or cream with intense movements in the process of making butter, to stir up and agitate, or to produce something at a rapid and regular rate. An example of to churn is for a boat to create waves while moving quickly through the water .
Quick Answer. Plants absorb energy from the sun and use photosynthesis to make sugars. Animals have mitochondria that use the sugars provided by plants to produce their own cellular energy. Plants that produce their own food, and food for other plants and animals using photosynthesis, are called autotrophs.
Plants have specific organs in their cells that convert sunlight to food energy through a process known as photosynthesis. A plant will capture the suns rays in a chloroplast through a chemical reaction and this conversion gives plants the ability to supply calories to all life. It is by plants that cows are fed and then the humans that feed on the cows. In this way, sunlight provides the source of food for all life on earth.