If humans could undergo the process of photosynthesis, lunch time would be much different. We would just sunbathe.

All living things on the planet need energy in order to survive. Humans take their food in through their mouths as they eat all types of different things. Plants on the other hand get their energy from the light given off by the sun. Three things need to be present for a plant to be able to undergo photosynthesis this includes: carbon dioxide, sunlight, and water. Plants take the carbon dioxide in through little holes in their leaves called stomata. The plant absorbs water from the soil using roots and gets that water to the rest of the body. As the sunlight passes through the leaves of the plants it travels through ton of chloroplasts found within the leaf. Within those chloroplasts the water molecules are split into hydrogen and oxygen. The oxygen leaves the leaf and the remaining hydrogen and carbon dioxide are used to form glucose which is a usable form of energy for the plant.

Approximately 85% of the world's oxygen is due to this process. That is why if the sun were to suddenly stop producing light, not only would it be dark; we would not be able to breathe much longer. These worksheets explore all aspects of the process of photosynthesis. This collective series of worksheets helps students investigate this process and examine where it happens. We move on to understand the chemistry that takes place in this process and how we have used that knowledge to mimic the process and create our own energy artificially. We also spend a good amount of time understanding the organisms that can perform this much needed activity.

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Printable Photosynthesis Worksheets

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What is It?

Plant respiration is the opposite of ours, since we breathe out carbon dioxide and plants breathe out oxygen.

What is It? Questions

Different kinds of plants need differing amounts of sunlight and water to thrive.

Photosynthesis and Cellular Respiration

Together, photosynthesis and cellular respirations are the basis of all life on Earth. The oxygen that is released by plants during photosynthesis is used by humans and almost all other organisms for our cellular respiration.

QUESTIONS: Photosynthesis and Cellular Respiration

Which process requires carbon dioxide and gives off oxygen?


Activities like eating and excretion are also part of the carbon cycle, as carbon is being taken into and passed back out of living organisms.


When we burn these substances, the energy that plants once captured from the sun through photosynthesis is released back out into the atmosphere.

Artificial Photosynthesis

This technology, which is called direct solar water splitting, could also be adjusted in order to turn carbon dioxide back into fuel.

QUESTIONS: Artificial Photosynthesis

Why is producing hydrogen fuel currently hard on the environment?

Photosynthetic Organisms

Prokaryotic organisms are single-celled organisms that do not contain a nucleus.

QUESTIONS: Photosynthetic Organisms

Plants, algae, and cyanobacteria all use the Calvin cycle to fix carbon dioxide.

Anoxygenic Photosynthesis

In this process while sunlight is still used to fix carbon, during the reaction something other than water donates an electron.

QUESTIONS: Anoxygenic Photosynthesis

How is green nonsulfur bacteria different from green sulfur bacteria?


Only plants and photosynthetic organisms contain chloroplasts. Simple cells, like those of photosynthetic algae, may only contain several chloroplasts.

QUESTIONS: Chloroplasts

Where exactly within the chloroplast is chlorophyll located?

Light Reactions | Dark Reactions

In the first step, sunlight is captured by the chloroplasts when molecules of chlorophyll absorb energy (in the form of sunlight).

QUESTIONS: Light Reactions | Dark Reactions

What other methods are there for an organism to use CO2 to make sugars?

Artificial Light

There are some key differences between sunlight and artificial light. Though artificial lights can mimic the full spectrum of natural light, the energy emitted by an artificial light in the red and blue spectrums does not have as much energy as the red and blue spectrums of natural sunlight.

QUESTIONS: Artificial Light

What kind of light was warm, indoor lighting contain a lot of?

Water and Heat

One of the characteristics of global warming is an increase of carbon dioxide in the air.

QUESTIONS: Water and Heat

How can prolonged stress from drought affect a plant?