DENDROLOGY

Detailed explanation-1: -A plant response to stimulus can be positive or negative. Positive tropism means the plants exhibits a response favouring the stimulus. Negative tropism means the plants exhibit a response away from the stimulus.

Detailed explanation-2: -Tropisms are the means by which plants grow toward or away from environmental stimuli such as light, gravity, objects to climb, moisture in soil, or the position of the sun.

Detailed explanation-3: -A negative tropism is the response of a plant to grow away from a stimulus. For example, negative gravitropism is exhibited by the stem of a plant that grows away from the force of gravity.

Detailed explanation-4: -Plant Tropisms A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism. Plants also exhibit phototropism, or growing toward a light source. This response is controlled by a plant growth hormone called auxin.