Examlex
A recent study reports that the more sexual content that adolescents watch on TV, the more likely they were to engage in sexual behaviors. However, it is unclear whether the sexual content on TV leads to sexual behavior or whether sexual behavior leads to a preference for sexual content on TV. This is an example of the third-variable problem.
Phototropic Response
the growth or movement of a plant organ toward or away from light, as a response to its direction.
Phytochrome
A blue-green, proteinaceous pigment involved in a wide variety of physiological responses to light; occurs in two interconvertible forms, Pr (red-absorbing phytochrome) and Pfr (far-red-absorbing phytochrome).
Bolting
The production of a tall flower stalk by a plant that grows vegetatively as a rosette (growth habit with a short stem and a circular cluster of leaves).
Gibberellins
A group of plant hormones that regulate growth and influence various developmental processes, including stem elongation, germination, and flowering.
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