Plants adapted to low light intensity have

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(D) The correct option is $D$.The proteinaceous photosynthetic unit $(PSU)$ size increases as light levels decline.At lower light levels,chloroplasts

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Larger photosynthetic unit size than the sun plants

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(D) The correct option is $D$.The proteinaceous photosynthetic unit $(PSU)$ size increases as light levels decline.At lower light levels,chloroplasts have a larger $PSU$ to increase the probability that a photon will strike the chlorophyll antenna.Therefore,plants adapted to low light intensity have a larger photosynthetic unit size compared to sun plants.Plants adapted to low light intensity do not have a higher rate of $CO_2$ fixation,nor do they typically have more extended root systems or leaves modified into spines (which are adaptations for arid environments).Thus,the correct answer is option $D$.

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