Warm up• Does food have energy?• What evidence do we have of this?

Warm up

• Does food have energy?• What evidence do we have of this?– Yes– Food will burn and release energy in the form of

heat and light.– We saw the cheese ball burn and heat the water.

PDSA

• Let’s sort out the PDSA folders:

• Leave the PlanDoStudyAct Page & Science Process Page in the Folder

• Glue the Due Dates Page & Grading Scale Page in Science Journal

Energy and Producers

Investigation 5 Day 2

Objective:

• Students will determine energy in food as evidenced by analyzing data from worksheet

Human Food Webs

• How do we as humans get the materials we need in order to grow, change, repair damage and replace things like skin, hair and nails?

• How do you get the energy you need to do all the other things we do?

• Plants don’t eat food. How do they get the energy to grow, etc?

Human Food Webs

• How do we as humans get the materials we need in order to grow, change, repair damage and replace things like skin, hair and nails?– Building materials come from food. Humans eat food to get the

atoms and molecules they need to make body tissue.• How do you get the energy you need to do all the other things

we do?– Humans get the energy they need by “burning” food as fuel.

Digested and processed food releases energy.• Plants don’t eat food. How do they get the energy to grow,

etc?– Plants produce their own energy for building materials and energy.

Questions for thought:

• What do plants make food out of? • What materials do plants need?

Experiment

• The last question “what materials do plants need to produce food?” can be answered with an experiment.

• We are going to look at the data from an experiment and see if we can learn anything.

• Once your group has analyzed the data, fill out lab sheet 25 with the results and what conclusion you can draw from the data.

• Write a well thought out conclusion in complete sentences and with supporting details.

What Did We Learn?

• What five factors were tested in the experiment?

• What are these 5 factors called in a controlled experiment? (What type of variable)

• Did the beans grow and produce food when all 5 factors were present?

• How much food was produced after 3 weeks?

What Did We Learn?

• What five factors were tested in the experiment?– Water, light, oxygen, carbon dioxide, nitrogen.

• What are these 5 factors called in a controlled experiment? (What type of variable)– Manipulated variable. The thing we change.

• Did the beans grow and produce food when all 5 factors were present?– Yes

• How much food was produced after 3 weeks?– About 50 grams

What Also Did We Learn?

• Were all the factors necessary for the beans to grow and produce food?

• What factors were needed for the beans to grow and produce food?

What Also Did We Learn?

• Were all the factors necessary for the beans to grow and produce food?– No. Beans grew and produced food without

oxygen and nitrogen.• What factors were needed for the beans to

grow and produce food?– Water– Light– Carbon dioxide

Photosynthesis

• The process by which green plants use energy from light to make sugar

• Copy this in your journals

Photosynthesis

• The process in plants that produces food is photosynthesis. – Photo- means light.– Synthesis means put together.

• That means that in the presence of light, plants put carbon dioxide and water together to make food called a carbohydrate.

• Carbohydrates are found in the form of sugar and starch. • Sugar and starch are used for building materials and energy by

the plants that make the food and the animals that eat the plant.

Food

• Food is organic matter that has energy that can be measured in calories.

• Calories are not ingredients in food that can be removed like raisins out of the Raisin Bran.

• The calorie is the unit used to measure energy in food. • All kinds of food have energy that can be measured in

calories. • Energy stored in food is made available to organisms when

the complex energy-rich molecules in food (like sugar and starch) are broken into fragments which re-form into simple molecules like water and carbon dioxide.

Food/Energy

• Carbohydrate is one form of food.

• Carbohydrates (like sugar and starch) are chemicals that have energy in the bonds that hold the atoms together.

• When the body breaks down sugars into simpler chemicals, energy is released.

• The amount of energy can be measured in calories.

• The energy from carbohydrates is the energy all living things use to do their work like running, jumping, digesting food, breathing and growing.

• Read: Where does Food Come From?

• As you read, in your science journals jot down 5 key facts

Closure

• Discuss Reading

• What key facts did you come up with?