ANSWER: increase in available sunlight and available carbon dioxide
Explanation;
-During photosynthesis, carbon dioxide and water are converted into plant food and oxygen with the help of chlorophyll and sunlight.
-Three factors can limit the speed of photosynthesis: light intensity, carbon dioxide concentration and temperature.
-At low light intensities, as light intensity increases, the rate of the light-dependent reaction, and therefore photosynthesis generally, increases proportionately.
-An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light-independent reaction, and so the rate of photosynthesis generally
increases.
-Although the light dependent reactions of photosynthesis are not affected by changes in temperature, the light independent reactions of photosynthesis are dependent on temperature.