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.