Chapter 26: Plant Responses to the Environment

1.	The hormone responsible for phototropism in plants is: [Hint]
2.	Plant movements in response to light are a phenomenon known as _______ induced by the hormone _______. [Hint]
3.	The herbicide 2,4-D is an artificially produced plant hormone similar to _______ that causes excessive cell growth. [Hint]
4.	Why do the coleoptiles of oats bend toward the light? [Hint]
5.	Gravitropism (geotropism) in roots is a response to _____, and the hormone ______. [Hint]
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