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Question

Present level of atmospheric CO2 is not limiting factor for which of the following photosynthetic plant category:-

A
Wheat plants
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B
Maize plants
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C
Sugarcane plants
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D
Bryophyllum plants
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Solution

The correct option is C Sugarcane plants
Sugarcane is a champion at photosynthesis under the right conditions and is a prime example of a C4 plant (one which uses C4 photosynthesis). Sugarcane has been recorded at 7% photosynthetic efficiency. C4 plants almost never saturate with light and under hot, dry conditions, they much outperform the C3 plants.

In intercropping condition, dry weight of shoot of C4 plants get decreased under elevated CO2 concentration. This indicates that competitive ability of those plants get reduced in these situations. In all investigated plants, root to shoot ratio is reduced by increasing CO2 concentration.

In C4 plants, the CO2 compensation point is zero or nearly zero, reflecting their very low levels of photorespiration. The CO2, absorbed by C4 leaves is fixed into organic acids, which maintains high levels of CO2. The mesophyll of C3 plants has no such mechanism of fixing CO2.

So, the correct answer is Sugarcane plants.

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