Plants respond to various stimuli by
A. Shedding leaves
B. Growing
C. Felling of fruits
D. Peeling of bark

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Hint: In physiology, a stimulus or stimuli is a detectable change in the physical or chemical structure of an organism's internal or external environment. The ability of an organism or organ to detect external stimuli, so that an appropriate reaction can be made, is called sensitivity.

Complete answer: Unlike animals, plants can’t run, fly, or swim toward food or away from danger. Plants are usually rooted in the soil. Instead, a plant’s primary means of response is to change how it is growing. Plants also don’t have a nervous system to control their responses. Their responses are generally controlled by hormones, which are chemical messenger molecules. Some plant responses are 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. Growing towards a light source is controlled by a plant growth hormone called auxin. Auxin stimulates cells on the dark side of a plant to grow longer. This causes the plant to bend toward the light.
So, the answer is B-Growing

Note: Plants also respond to daily and seasonal cycles and to disease. Many plants respond to the days growing shorter in the fall by going dormant. They suspend growth and development in order to survive the extreme cold and dryness of winter. Dormancy ensures that seeds will germinate and plants will grow only when conditions are favorable. Thus, they responded according to the change in season.