Control of Phototropism: The figure shows some of the treatments and results of

Question

Control of Phototropism: The figure shows some of the treatments and results of the Darwins' studies of phototropism in grass seedlings. Which of the following is not a conclusion that resulted from these studies? (2 points) METHOD Coleoptile Primary root Light Blindfold LIFE9e, Figure 37.8 (Part 1) Light is sensed in the tip of the coleoptile. Light caused movement of a growth promoting substance from the tip to the growing region. A signal travels from the tip downward. O Bending occurred in a region below the tip. Light did not directly affect the growing region where bending occurred.

Explanation / Answer

The conclusion, which is not resulted from the Darwin’s studies on the phototropism, is light cased the movement of a growth-promoting substance from the tip to the growing region. Thus, the correct option is (B).          

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