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Plants adapted to low light intensity have:

1. larger photosynthetic unit size than the sun plants
2. higher rate of CO2 fixation than the sun plants
3. more extended root system
4. leaves modified to spines

Correct answer: larger photosynthetic unit size than the sun plants

Solution

Plants adapted to low light need to absorb as much available light as possible, so they have larger photosynthetic units with more antenna pigments per reaction center. Sun plants usually have smaller units because light is abundant.

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