The bending of a bean seedling towards light during photosynthesis is primarily caused by phototropism. Phototropism is the growth response of a plant toward a light source, which occurs due to differential growth rates on the sides of the plant that are exposed to light versus those that are not.
To clarify the other terms:
- Gravitropism refers to a plant's growth response to gravity, with roots growing down (positive gravitropism) and shoots growing up (negative gravitropism).
- Thigmotropism is the response of a plant to touch or physical contact, often seen in climbing plants.
- Rapid response typically refers to immediate reactions to stimuli, like the closing of a Venus flytrap, rather than growth responses.
In your case, since you're asking about bending related to light during photosynthesis, phototropism is the correct answer.
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