Growth or movement of a plant or animal toward or away from an external stimulus, such as light, heat, or gravity. tropism. the tendency of a plant, animal, or part to move or turn in response to an external stimulus, as sunlight or temperature. â tropistic, adj.
The definition of a graph is a diagram showing the relationships between two or more things. An example of graph is a pie chart. Graph is defined as to create a diagram that shows a relationship between two or more things. An example of graph is to create a series of bars on graphing paper.
Show that the following are equivalent definitions for a tree: 1  A graph with a minimal number of edges which is connected. 2  A graph with maximal number of edges without a cycle. 3  A graph with no cycle in which adding any edge creates a cycle.  A graph with n nodes and n-1 edges that is connected.