Question

In Blackmann's Law of Limiting Factors the rate of photosynthesis continues to increase with the successive increase in the amounts of

• A. Carbon dioxide, light, temperature
• B. Temperature, light, carbon dioxide
• C. Light, temperature, carbon dioxide
• D. Light, carbon dioxide, temperature

Answer 1

The correct option is A Carbon dioxide, light, temperature

Blackman proposed the law of limiting factors in 1905. Accorrding to this law, when a process depends on a number of factors, its rate is limited by the pace of the slowest factor. Blackman's law of limiting factors determines the rate of photosynthesis. Although increase in all these will increase the rate of photosynthesis but only upto optimal levels. Example CO${}_2$ beyond 1% is toxic, temperature beyond 400 C is harmful and extreme high light intensity will be harmful.