What Did Darwin's Experiments on Phototropism Illustrate

question 65

Multiple Choice

What did Darwin's experiments on phototropism illustrate?

• A) that signals from plant roots control phototropism
• B) that a translucent cap placed over a shoot tip will cause a plant to both grow and bend toward light
• C) that a translucent cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth
• D) that an opaque cap placed over a shoot tip will cause a plant to bend toward light, but will inhibit growth

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