Biology Unit 3

RatMixx2000
Flashcards by RatMixx2000, updated more than 1 year ago
RatMixx2000
Created by RatMixx2000 almost 6 years ago
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Year 7 (Upper 3) Biology

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U3 Biology 2015 U3 Biology 2015
Unit 3: Diet & Digestion
Topic 1. Balanced Diet
What is the purpose of carbohydrates? To provide energy.
What are the purposes of proteins? Growth and repair
What is the purpose of fibre? To keep food moving through the system.
What is the purpose of vitamins? Keeps the body healthy
What is the purpose of minerals? Keeps the body healthy
What are the purposes of fats? Gives the body energy and warmth.
What is the purpose of water? To hydrate the body
Topic 2: Investigating Foods
What is the test for protein? Add 5-10 drops of Biuret A to a test tube with a food mixed in 0.5cm depth water. Add 5-10 drops of Biuret B.
What is the test for fats? Rub some food to a bit of paper. Hold to the light.
What is the test for glucose? Add 5-10 drops of Benedict's solution to a test tube with your food, shaken with 0.5cm of water. Put the test tube into a hot water bath.
What is the test for starch? Add 2-5 drops of iodine to the food.
What are the two groups of carbohydrates? Sugar (glucose) and starch.
Where do you find natural sugars? Fruits.
Diet & Nutrition
What problems can added sugars cause? Tooth decay.
Why are starchy carbohydrates good? They give us lots of energy.
What are harmful fats known as? Saturated fats.
What are the long term benefits of eating fibre? Protection against heart problems and cancer.
What are the key minerals for teenagers? Iron & Calcium
What proportion of the Human Body is water? 2/3 (Brain, 80%)
What is the cause of scurvy? Lack of Vitamin C
How can you prevent scurvy? By eating fruits (citrus especially).
Topic 3. Teeth
What are incisors and what are they for? They cut the food.
What are canines and what are they for? They rip the food, ready to grind.
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