Bozeman Science
Archaea
There's archaea in my primordial soup! Viewers watch a video that explains what an archaea is, why it took us so long to find them, how they are different from eucaryota and bacteria, and the interesting discoveries about their...
Curated OER
STEMbite: How Trees Grow
Go to the light! That's what trees do; they grow towards light since they need it to produce energy. This phenomenon is called phototropism. Trees also grow in response to gravity, a phenomenon known as geotropism. In this video, the...
Indiana University
Indiana University: Plants in Motion: Tropism
View time-lapse videos that show how plants respond to their environment. Observe how phototropism and gravitropism result from differential growth in plants.
Khan Academy
Khan Academy: 5 a B, Responses to the Environment
Review and analyze over a phototropism investigation in this video. This video shows a worked example of an AP biology exam free response question. [6:53]
Bozeman Science
Bozeman Science: Behavior and Natural Selection
Paul Andersen explains how the behavior of various organisms is shaped by natural selection. The action of phototropism and the timing of photoperiodism have both been shaped by the relative availability of light. Courtship in the bower...
Bozeman Science
Bozeman Science: Mechanisms of Timing and Control
Paul Andersen explains how organisms regulate timing and control. Phototropism and Photoperiodism allow plants to respond to light throughout the day and year. Circadian rhythms are used in all organisms (including animals) as an...