Active solar energy is solar panels or other mechanical energy systems from the sun, while passive are things like the sun heating your house from south facing windows (greenhouse affect).
Plants too are the living organisms of the ecosystem. They too respond to the external environmental stimuli.
Phototropism is the best example for it. All of us know that for plants to grow light is necessary . Hence all plants respond to the changes in the environment , and respond to it by growing their stems, roots, or leaves toward the direction of stimulus or away from the stimulus.
