Biology: Photosynthesis and Plant Energy

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Questions and Answers

What is the role of chlorophyll in photosynthesis?

To release carbon dioxide

To absorb water

To trap light energy (correct)

To produce oxygen

Animals can make their own food through photosynthesis.

False

What is the primary source of energy for living things on Earth?

The Sun

Energy from the Sun is used by plants to produce ______________________ during photosynthesis.

sugar Signup and view all the answers

Match the following forms of energy with their descriptions:

Kinetic energy = Energy of motion or movement Heat energy = Energy that makes things warm or hot Sound energy = Energy that we can hear Electrical energy = Energy generated in power stations Signup and view all the answers

What is the energy stored in an object placed above the ground?

Gravitational potential energy Signup and view all the answers

Energy can be created or destroyed.

False Signup and view all the answers

What happens to energy during friction?

It is converted to heat Signup and view all the answers

What is the role of stomata in photosynthesis?

To take in carbon dioxide Signup and view all the answers

Plants can produce food without sunlight.

False Signup and view all the answers

What is the energy stored in stretched, wound-up, or compressed objects called?

Elastic potential energy Signup and view all the answers

The energy that makes things warm or hot is called ______________________ energy.

heat Signup and view all the answers

What is the energy of a moving object?

Kinetic energy Signup and view all the answers

Plants use the energy in the sugar they produce to obtain energy.

False Signup and view all the answers

What is the energy stored in food, fuels, and batteries called?

Chemical potential energy Signup and view all the answers

For objects at the same height, the one with bigger mass has more ______________________ energy.

gravitational potential Signup and view all the answers

Match the following forms of energy with their descriptions:

Light energy = enables us to see Kinetic energy = is the energy of motion or movement Electrical energy = is energy usually generated in power stations Heat energy = is the energy that makes things warm or hot Signup and view all the answers

Energy can be changed from one form to another.

True Signup and view all the answers

Study Notes

Photosynthesis

Light is trapped by chlorophyll to produce energy
Carbon dioxide is taken in through stomata, and water is absorbed by roots and transported to leaves
Sugar is produced and transported to other parts of the plant, while oxygen is given out through openings on leaves

Factors Affecting Photosynthesis

Amount of light
Amount of carbon dioxide
Amount of water

Plant Energy

Plants use energy in sugar to stay alive
Excess sugar is stored as starch
Plants use sunlight to make food, passing energy to animals when they eat the plants

Energy Sources

The Sun is the primary source of heat and light for living things on Earth
Energy in food can be traced back to the Sun

Energy Types

Light energy: enables us to see
Kinetic energy: energy of motion or movement
Heat energy: energy that makes things warm or hot
Sound energy: energy that we can hear, produced by activities like whistling, tapping, clapping
Electrical energy: energy generated in power stations, stored in batteries and solar cells, can be changed to other forms like light, heat, sound
Potential energy: energy stored in objects, including chemical, gravitational, and elastic potential energy
Chemical potential energy: stored in food, fuels, and batteries, can be changed to other forms like heat, electrical, light, sound
Gravitational potential energy: energy stored in an object placed above the ground, decreases as height decreases
Elastic potential energy: energy stored in stretched, wound-up, or compressed objects like rubber bands, toy springs

Energy Conversion

Energy can be changed from one form to another, but cannot be created or destroyed
Examples of energy conversion:
- Gravitational potential energy to kinetic energy
- Chemical potential energy to electrical energy to sound energy
- Electrical energy to heat and light energy
- Chemical potential energy to kinetic, heat, and sound energy

Energy and Living Things

Food provides energy needed for activities
All living things get energy from food
Energy converted to heat is most likely due to friction

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Description

Learn about the process of photosynthesis, factors that affect it, and how plants use energy from sugar to stay alive. Discover how plants produce energy and store excess sugar as starch.