We benefit from plants in a lot of ways. 1. We use things that the plants produce, such as cotton, to make clothes. 2. We eat plants to stay alive (fruits and vegetables). 3. We breathe in oxygen and we breathe out CO2, which then turns around and the plants take in CO2 and release oxygen. 4. Plants help reduce the amount of carbon dioxide which has been blamed for global warming as it traps the heat from the sun in the atmosphere.
Phototropisms are helping the plants survive by getting the sunlight needed. Hydrotropisms are helping the plants survive by getting the needed water. Chemotropisms are helping the plants survive by getting the nutrients needed. Auxins help the plants survive, its main role is to work with another type of hormone (cytokinins and Gibberellins) to stimulate elongation of stems. Ethylene help ripe the fruit, so that when ripe the Abscisic Acid can do its job by letting the leaves and fruit fall off.
The plants bend toward the stimuli to get the much needed sunlight. They respond to Thingmotropism by trying to bend its way up the object it has touched. Thigmotropism is a movement in which a plant moves or grows in response to touch or contact stimuli.