The Great Exchange: Photosynthesis and Respiration Balance Quiz

Photosynthesis is the primary way carbon enters the living parts of the carbon cycle. Plants use sunlight energy to turn carbon dioxide and water into glucose and oxygen.

This is a common mistake. Plants perform photosynthesis during the day to make food, but they must perform respiration 24 hours a day to break down that food into energy for growth and repair.

Stomata act like tiny mouths. They open to let carbon dioxide in for photosynthesis and let oxygen out as a byproduct.

During respiration, organisms break down sugar using oxygen. This process releases carbon dioxide and water back into the environment along with the energy needed to live.

Without photosynthesis to act as a carbon sink, the carbon dioxide released by animals and volcanoes would build up in the atmosphere, trapping more heat and causing global temperatures to rise.

The total amount of carbon on Earth stays the same. The carbon cycle simply moves that carbon between different places like the air, the water, and living things.

Producers like trees, grass, and algae are the starting point of the climatorial carbon cycle because they are the main bridge between the atmosphere and the food web.

Plants need specific "ingredients" to work efficiently. Increasing light and CO2 generally speeds up the process, while extreme cold can slow down or stop the chemical reactions inside the plant.

Just like on land, tiny ocean plants called phytoplankton perform photosynthesis. This balance ensures there is enough oxygen for fish to breathe and prevents the water from becoming too acidic.

Most oxygen in the deep sea was produced by plants and algae at the surface. Currents carry this oxygen-rich water down to the depths, proving how connected the different parts of the cycle are.

Carbon moves through the food chain as energy-rich molecules. When the animal breathes out, that carbon returns to the atmosphere as CO2.

Burning fossil fuels releases old carbon that was buried for millions of years, while deforestation removes the trees that pull CO2 out of the air. Both actions cause CO2 to build up.

In summer, there is more direct sunlight and longer days, allowing plants to pull more CO2 out of the air. This actually causes global CO2 levels to dip slightly every summer.

When plants and animals die, bacteria and fungi break them down. This process uses oxygen and releases carbon dioxide, similar to how respiration works.

While transpiration is part of the water cycle, it is closely linked to the carbon cycle because stomata must open to let CO2 in, which also allows water to escape.