U3 - L3 Why do Living Things Need Food?

1. There are many different kinds of food. If you could test every food with the indicators you used in class, what do you think you would find out? Why?

• I would find out that some of the foods would test positive for at least one of the indicators and some of the foods would test negative. You can be a food and not be protein, fat, or carbohydrate.

• In order to be food, it must contain at least one of the following substances: protein, fat, or carbohydrate, so it would test positive with one or more of the indicators.

• In order to be considered a food, it must contain protein, fat, carbohydrates, vitamins, and minerals.

• Some foods will not respond to the indicators but they still contain vitamins and minerals.

Part 1: Which of the substances on this label for potato chips are considered food?

• Fat, Carbohydrates (dietary fiber and sugars), Protein

• Fat and Carbohydrates

• Carbohydrates and Protein

• Fat and Protein

Part 2: 

Why are these substances considered food?

• We eat them

• They are solids

• They supply energy and building materials.

• They can be grown in the ground or developed in a laboratory.

Write an evidence-based explanation backing the claim that water is not food.

Claim: Water is not food.

Part 1: Evidence: Choose all that apply.

• Food labels show that water does not contain carbohydrates, protein, or fat.

• We drink water and liquids can’t be food.

• We tested the water for carbohydrates, proteins, and fats. These are substances in food, and water had none of these nutrients. 

• Water is good for you so it is not food.

Write an evidence-based explanation backing the claim that water is not food.

Claim: Water is not food.

Part 2: Reasoning:

• Our scientific principles tell us that food contains the substances protein, fat, and carbohydrates. Since water has these substances, it must not be food.

• Our scientific principles tell us that food contains the substances protein, fat, and carbohydrates. Since water does not have these substances, it must be food.

• Our scientific principles tell us that food contains the substances protein, fat, and carbohydrates. Since water does not have these substances, it must not be food.

• Our scientific principles tell us that food contains the substances protein, fat, and carbohydrates. Since water has these substances, it must be food.

Which of these items found on a food label IS NOT food?

• Calories

• Sugar

• Protein

• Total fat

Construct an evidence-based scientific explanation that will persuade others that orange juice is food.

Claim:

• Orange juice is not food

• Orange juice is food

 Construct an evidence-based scientific explanation that will persuade others that orange juice is food.

Evidence:

• Orange juice does not contain sugar

• Orange juice contains sugar

• Orange juice contains fat

• Orange juice contains protein

Construct an evidence-based scientific explanation that will persuade others that orange juice is food.

Reasoning:

• Our scientific principles tell us that all food has protein, fat, or carbohydrates. Since orange juice has fat, then it must be food.

• Our scientific principles tell us that all food has protein, fat, or carbohydrates. Since orange juice has protein, then it must be food.

• Our scientific principles tell us that all food has protein, fat, or carbohydrates. Since orange juice has sugar which is a carbohydrate, then it must be food.

• Our scientific principles tell us that all food has protein, fat, or carbohydrates. Since orange juice does not have any of these, then it must not be food.