Difference between phototropic and photonastic
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1 -Tropic and nastic movements are influenced by environmental cues. Tropic movements are found virtually in all plants but nastic movements are mostly found in specialized plants and organs.
2- In tropic movements, there is directional growth of a plant, or part of a plant, in response to an external stimulus such as gravity or light. So the direction of the stimulus controls the orientation of growth. The direction of a nastic movement is independent of where the signal comes from. It is only the quality, and not the direction, of the stimulus that triggers a response.
3- In tropism, the effect is more or less permanent. Most nastic movements are temporary and reversible.
Nastic movements are more specialized in function and distribution than tropic movements.
2- In tropic movements, there is directional growth of a plant, or part of a plant, in response to an external stimulus such as gravity or light. So the direction of the stimulus controls the orientation of growth. The direction of a nastic movement is independent of where the signal comes from. It is only the quality, and not the direction, of the stimulus that triggers a response.
3- In tropism, the effect is more or less permanent. Most nastic movements are temporary and reversible.
Nastic movements are more specialized in function and distribution than tropic movements.
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Answer:
Phototrophic movements in plants are those growth related movements in plants which depend on light eg. -plant's shoot moves toward sunlight. Whereas, Photonastic movements are the non directionl movements caused beacause of light.
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