Question

Plants adapted to low light intensity have

• A. Larger photosynthetic unit size than the sun plants
• B. Higher rate of CO${}_2$ fixation than the sun plants
• C. More extended root system
• D. Leaves modified to spines

Answer 1

The correct option is A Larger photosynthetic unit size than the sun plants

The Proteinaceous Photosynthetic unit (PSU) size increases as light levels decline. At lower light levels, chloroplasts have larger PSU to increase the probability that a photon will strike the chlorophyll antenna. So, plants adapted to low light intensity have larger photosynthetic unit size than the sun plants. Plants adapted to low light intensity does not have a higher rate of CO${}_2$ fixation, more extended root system and leaves are not modified to spines.

So, the correct answer is option C.