What happens to the rate of photosynthesis when carbon dioxide concentration increases?

When carbon dioxide concentration increases, the rate of photosynthesis typically increases steadily, assuming other factors such as light intensity and temperature are also favorable. Carbon dioxide is one of the key raw materials that plants use to produce glucose during photosynthesis, which takes place in the chloroplasts of plant cells.

As the concentration of carbon dioxide rises, plants are able to absorb more of it, leading to a higher rate of the photosynthesis reaction. This results in more glucose and oxygen being produced. However, the increase in the rate of photosynthesis will only continue until another factor becomes limiting, such as light intensity or temperature.

The option indicating that it remains constant does not account for the impact of increasing carbon dioxide levels on the rate of photosynthesis. Similarly, a decrease in rate or erratic changes does not accurately reflect the expected steady increase due to higher availability of carbon dioxide, provided other conditions are optimal.