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

Light saturation for \(CO _2\) fixation occurs at \(10 \%\) of full sunlight.

Increasing atmospheric \(CO _2\) concentration upto \(0.05 \%\) can enhance \(CO _2\) fixation rate.

\(C _3\) plants responds to higher temperatures with enhanced photosynthesis while \(C _4\) plants have much lower temperature optimum.

Tomato is a greenhouse crop which can be grown in \(CO _2-\) enriched atmosphere for higher yield.