The Cycle of Life: Plants, Animals, and the Air We Share

What do plants need to make their food during photosynthesis?

• Water and soda

• Carbon dioxide and water

• Oxygen and carbon dioxide

• Sunlight and chocolate

During photosynthesis, what energy source do plants use to convert carbon dioxide and water into glucose and oxygen?

• Electricity

• Sunlight

• Moonlight

• Heat from the Earth

What is the main purpose of photosynthesis?

• To produce oxygen for the plant itself

• To clean the air

• To produce food (glucose) for the plant

• To make the plant grow taller

What happens to the glucose produced during photosynthesis?

• It is released into the air.

• It is used by the plant for growth and energy.

• It turns into water.

• It is used to produce more oxygen.

What is the main product of photosynthesis that animals, including humans, need to breathe?

• Carbon dioxide

• Oxygen

• Nitrogen

• Hydrogen

Why is oxygen important for animals?

• It helps them to grow.

• It is used to make food.

• It is needed for respiration to release energy.

• It helps them to swim.

How do animals contribute to the carbon dioxide-oxygen cycle?

• By breathing in oxygen and exhaling carbon dioxide

• By eating plants

• By sleeping

• By swimming

What gas do animals exhale that plants need for photosynthesis?

• Oxygen

• Nitrogen

• Carbon dioxide

• Helium

Why is the carbon dioxide-oxygen cycle important for life on Earth?

• It helps to cool down the Earth.

• It ensures a continuous supply of oxygen for animals and carbon dioxide for plants.

• It makes the oceans deeper.

• It increases the speed of the Earth's rotation.

What would happen if there were no plants on Earth?

• Animals would have too much oxygen.

• The Earth would be too hot.

• There would be no oxygen for animals to breathe.

• The oceans would dry up.