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On entering a darkened room, the A. Threshold light intensity for the eye starts to rise. B. First phase of retinal adaptation is mainly in the cones. C. Final phase of retinal adaptation is mainly in the rods. D. Adaptation is slower if a long period was spent in bright light beforehand. E. Time course for pupillary dilatation is similar to that for dark adaptation. |
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Answer» A. False It begins to fall in the process of dark adaptation. B. True The initial adaptation is due more to cone adaptation. C. True Rods are slower to adapt but show more profound adaptation. D. True A previous long exposure would bleach most of the rhodopsin so more time would be needed for its resynthesis. E. False The pupil dilates almost immediately in the dark. |
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