The discovery of auxin can be traced back to the work of Charles and Francis Darwin and their studies of
A) photosynthesis.
B) photorespiration.
C) photophosphorylation.
D) phototropism.
E) photoperiodism.

Question

Quizplus · Accepted Answer

Charles and Francis Darwin's work was focused on the phenomenon of phototropism, which is the directional growth of plant shoots and roots in response to light. They discovered that the tip of the plant, which they called the "receptive organ," was responsible for regulating this growth. They also found that it was able to exert an influence on the rest of the plant, even when physically separated from it. This led them to hypothesize the existence of a plant growth hormone, which they called auxin.

The Discovery of Auxin Can Be Traced Back to the Work