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Energy transfers Starter: • Write a list of the food you have eaten so far today. • Where does all of the energy in your food originally come from?

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Page 1: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Energy transfers

Starter:• Write a list of the

food you have eaten so far today.

• Where does all of the energy in your food originally come from?

Page 2: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Where does all of the energy in your food originally come

from?

The Sun

Page 3: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Learning outcomes

• State that the energy in food originated from the sun.

• Describe how energy is lost at every stage of a food chain.

• Explain why glucose made in photosynthesis is stored as starch

Page 4: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Key words

• Energy• Food chain• Respiration• Movement• Waste• Urea• Faeces

• Efficiency• Photosynthesis• Chlorophyll• Chloroplast• Chemical energy• Glucose• Starch

Page 5: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

All food chains begin with energy from the sun.

So you are (indirectly) solar powered!

Page 6: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

The sun is not usually included in food chains so the previous diagram becomes:

Food chains

Page 7: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Copy the diagram above and answer the following questions:

1. Which direction are the arrows pointing?

2. What is this showing about how energy is transferred in this food chain?

3. What are the arrows that split off from the food chain showing about the energy transfer at each stage?

Food chain questions

Page 8: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Answers1. The arrows are pointing right.

2. This shows that energy is passed along the food chain.

3. The arrows that split off from the food chain show that energy is lost at every stage of the food chain.

Page 9: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Why is energy lost at every stage of the food chain?

Page 10: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

All animals lose energy in:

1. Respiration (which includes movement and keeping warm in warm blooded animals)

2. Excretion of urea in urine and undigested food in faeces

Page 11: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

energy used for growth (output)efficiency =

energy supplied (input)

100 – 60 – 34efficiency =

100

Q: What is the efficiency of farming cows for food?

= 6 / 100= 0.06= 6%

A:

Page 12: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Q: What is the efficiency of this plant?

A: 5% (of the light energy is converted into chemical energy in glucose)

5% of the light is converted into glucose

95% of the light is reflected.

Page 13: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Why are plant leaves only 5%

efficient?

Page 14: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Q: Why are plant leaves only 5% efficient?

A: Approx. 95% of the energy hitting the plant is reflected.

The rest of the wasted energy in plants:–heats up leaves –is absorbed by non-photosynthetic

parts –is transmitted through leaves

Page 15: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

How does the plant convert light energy to chemical energy?

Page 16: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Q: How does the plant convert light

energy to chemical energy?

A: Through the process of

photosynthesis

Page 17: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

What is the equation for photosynthesis?

CO2 + H2O C6H12O6 + O26 66light

Carbon dioxide + Water Glucose + Oxygen

Can you balance it?

Page 18: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

What does photosynthesis require?

Photosynthesis requires:

1. Carbon dioxide

2. Water

3. Sunlight

4. Chlorophyll contained in the chloroplasts of the plant cells.

Page 19: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?
Page 20: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Storing the chemical energy

• The glucose made in photosynthesis is used for growth, repair and respiration by the plant.

• Extra glucose is stored as starch.

• This is what we usually eat (e.g. potato, rice, wheat).

Page 21: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?
Page 22: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

How does photosynthesis relate to respiration?

Respiration is the opposite to photosynthesis, releasing energy from glucose and oxygen:

Photosynthesis:

Carbon dioxide + Water Glucose + Oxygen

Respiration:

Glucose + Oxygen Carbon dioxide + Water

energy in

energy out

Page 23: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

Past paper questions

Answer the past paper questions

Page 24: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

1 Choose from the following list the correct products of photosynthesis.A water and carbon dioxide B glucose and carbon dioxideC glucose and oxygenD water and carbon dioxide

Plenary Quiz

Page 25: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

1 Choose from the following list the correct products of photosynthesis.A water and carbon dioxide B glucose and carbon dioxideC glucose and oxygenD water and carbon dioxide

Page 26: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

2 In plants starch is used:A to make flowers colourful.B as a store of energy.C to absorb water from the soil.D to make leaves green.

Page 27: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

2 In plants starch is used:A to make flowers colourful.B as a store of energy.C to absorb water from the soil.D to make leaves green.

Page 28: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

3 Starch is part of a balanced diet because:A it is needed for strong bones and teeth.B it helps the digestive system remain healthy.C it is a source of energy.D it is needed for growth and repair of cells.

Page 29: Energy transfers Starter: Write a list of the food you have eaten so far today. Where does all of the energy in your food originally come from?

3 Starch is part of a balanced diet because:A it is needed for strong bones and teeth.B it helps the digestive system remain healthy.C it is a source of energy.D it is needed for growth and repair of cells.


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