With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

(1) Light saturation for CO2 -fixation occurs at 10% of full sunlight.

(2) Increasing atmospheric CO2 concentration upto 0.05% can enhance CO2 -fixation rate

(3) C3 -plants respond to higher temperature with enhanced photosynthesis, while C4 -plants have much lower temperature optimum.

(4) Tomato is greenhouse crop, which can be grown in CO2 -enriched amosphere for higher yield. 

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