Photosynthesis and Respiration

Respiration and Photosynthesis

Poll

Predict where trees receive most of their mass from.

• Soil

• Water

• Air

• Photosynthesis

Multiple Choice

Select the option that best completes the following sentence.

Photosynthesis requires light energy to split water molecules into:

• Oxygen and Glucose

• Oxygen and Hydrogen

• Hydrogen and Carbon Dioxide

• Carbon Dioxide and Oxygen

Multiple Select

Predict which of these you would expect to increase a pot plant's ability to photosynthesize. (Select all that apply)

• Providing it with plenty of water

• Enclosing it in a tank of pure oxygen instead of air

• Placing it in a dark room

• Increasing the concentration of carbon dioxide in the air

Photosynthesis

Trees and other plants get a lot of their mass from carbon dioxide in the atmosphere. This combines with water in a chemical reaction known as photosynthesis. Besides matter – carbon dioxide and water – the reaction also requires energy in the form of sunlight.

Photosynthesis

Photosynthesis is a chemical process with two main stages:

1. Light energy splits water to form oxygen and hydrogen

2. The hydrogen combines with carbon dioxide to form glucose, a simple sugar made up of carbon, hydrogen and oxygen

Photosynthesis

Land plants aren't the only things that carry out photosynthesis – there's also algae and a type of bacteria called cyanobacteria. In the oceans, many types of plankton carry out photosynthesis.

Match

Label the four spheres to show how they interact during photosynthesis.

• Atmosphere

• Hydrosphere

• Biosphere

• Lithosphere

1

2

3

4

• 1

• 2

• 3

• 4

Respiration

Respiration is the reaction that releases the chemical energy in glucose for use in life processes. All living things need energy and use respiration to get it.

Respiration is often called cellular respiration because it takes place in cells. Each individual cell has to carry it out in order to stay alive. But the energy released is also used by whole organisms – to grow, repair damage, and reproduce.

Respiration

There are different types of respiration, but the most common use oxygen and glucose to form carbon dioxide and water.

They are the same as in photosynthesis, except there, carbon dioxide and water react to form glucose and oxygen. So respiration is the reverse reaction of photosynthesis.

Multiple Choice

Identify whether the following statement is true or false.

Photosynthesis occurs in plants but respiration only occurs in animals.

• True

• False

Multiple Choice

Select the word equation for respiration.

Hint: Remember that respiration is the reverse of photosynthesis.

• Glucose + Carbon Dioxide > Water + Oxygen + Energy

• Water + Carbon Dioxide + Energy > Glucose + Oxygen

• Glucose + Oxygen > Carbon Dioxide + Water + Energy

• Glucose + Oxygen + Energy > Carbon Dioxide + Water

Multiple Choice

Determine whether the following statement is true or false.

While respiration in plants requires glucose, respiration in animals does not.

• True

• False

Multiple Select

Determine which of the following would require at least some of your body's cells to respire. 

• Playing a football game

• Growing taller

• Recovering from a leg injury

• Eating a meal

Multiple Choice

Describe the relationship between respiration and breathing.

• They are both chemical reactions and one is the reverse of the other

• Breathing provides the carbon dioxide needed for respiration

• Respiration is the chemical reaction with the sole function of allowing us to breathe

• Breathing makes respiration possible by supplying oxygen from the air and getting rid of the carbon dioxide produced

Fact or Cap

Multiple Choice

"Climate change is just part of the natural cycle."

• Fact

• Cap

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No

Multiple Choice

Would you believe this?

• Yes

• No