What is biological tropism?
In addition to phototropism, or an organism’s response to light stimuli, what are at least two other types of tropism that exist in nature?
How is time-lapse photography different from high-speed, or slow-motion, photography?
- In positive phototropism, organisms move or grow toward a light source. In negative phototropism, organisms move or grow away from a light source.
- Auxins are the class of light-sensing hormones responsible for regulating phototropism in plants.
- Dr. John Nash Ott’s work with time-lapse photography and plant growth led him to believe that exposure to different wavelengths of light could impact animal and human behavior. Ott discussed these views in his 1973 book, Health & Light.
Term Part of Speech Definition Encyclopedic Entry high-speed photography Noun
the science of taking pictures of very fast phenomena.
art and science of producing still or moving images using the chemical reaction of light on a sensitive surface, such as film or an electronic sensor.
growth or movement of a sessile organism toward or away from a source of light.
time-lapse photography Noun
photographing of a slow and continuous process at regular intervals, for projection at a higher speed.
an orientation of an organism to an external stimulus, as light, especially by growth rather than by movement.
This material is based in part upon work supported by the National Science Foundation under Grant No. DRL-0840250. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author and do not necessarily reflect the views of the National Science Foundation.
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