Question

Which of the following external factors affect the rate of photosynthesis?

• A. Light only
• B. Light and temperature
• C. CO${}_2$ concentration and water
• D. Both b and c

Answer 1

The correct option is D Both b and c

The rate of photosynthesis is under the influence of several factors, both internal (plant) and external. The plant factors include the number, size, age and orientation of leaves, mesophyll cells and chloroplasts, internal CO${}_2$ concentration and the amount of chlorophyll. The external factors include the availability of sunlight,
temperature, CO${}_2$ concentration and water.