Energy Changes in Nature and Tools

What is the main energy source for photosynthesis?

• Carbon dioxide

• Sunlight

• Water

• Glucose

Which gas do plants take in during photosynthesis?

• Oxygen

• Carbon dioxide

• Nitrogen

• Hydrogen

What do plants produce as a result of photosynthesis?

• Oxygen and nitrogen

• Glucose and oxygen

• Nitrogen and glucose

• Carbon dioxide and water

How does sunlight help in the process of photosynthesis?

• Sunlight cools the plants, preventing overheating during photosynthesis.

• Sunlight helps in the process of respiration, not photosynthesis.

• Sunlight is essential for photosynthesis as it provides the energy required to convert carbon dioxide and water into glucose and oxygen.

• Sunlight is only needed for the growth of plants, not for photosynthesis.

What type of energy do solar panels convert?

• nuclear energy

• electromagnetic energy (sunlight)

• thermal energy

• mechanical energy

What is an example of a tool that changes energy from one form to another?

• Generator

• Solar panel

• Battery

• Light bulb

How do wind turbines generate electricity?

• Wind turbines generate electricity by using solar panels to capture sunlight.

• Wind turbines generate electricity through the use of water turbines in rivers.

• Wind turbines create electricity by burning fossil fuels to produce steam.

• Wind turbines generate electricity by converting wind energy into mechanical energy, which is then transformed into electrical energy using a generator.

What energy transformation occurs in a battery-operated toy?

• Mechanical energy to sound energy

• Nuclear energy to electrical energy

• Electrical energy to thermal energy

• Chemical energy to electrical energy to mechanical energy

What type of energy is stored in food?

• Thermal energy

• Kinetic energy

• Nuclear energy

• Chemical energy

How do plants use sunlight to make their food?

• Plants convert sunlight into heat for growth.

• Plants use sunlight to create energy without any raw materials.

• Plants absorb sunlight to release oxygen only.

• Plants use sunlight to convert carbon dioxide and water into glucose through photosynthesis.