Warm up Does food have energy What evidence

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 Plan. Do. Study. Act 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 reform 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?