UNIT 1 - Nutrition and Health (3) Flashcards
Name the test and reagent for starch. (1 mark)
Starch test
Iodine
Name the test and reagent for sugar. (1 mark)
Benedict’s test
Benedict’s solution
Name the test and reagent for protein. (1 mark)
Biuret test
Sodium Hydroxide and Copper Sulphate
Name the test and reagent for fat. (1 mark)
Ethanol Test
Ethanol
Describe the method and results for a Starch Test (2 marks)
- Add iodine to the food
Positive result - Yellow-brown to blue black
Describe the method and results for a Benedict’s Test. (2 marks)
- Add Benedict’s solution to the food and heat in a hot water bath.
Turns from blue to green to orange to brick red precipitate.
Describe the method and results for a Biuret test. (2 marks)
- Add sodium hydroxide to the food solution, the add copper sulphate and shake.
Turns from blue to purple
Describe the method and results for a Ethanol Test. (2 marks)
- Mix the food with Ethanol.
Turns from clear to white emulsion.
Explain why sugar is needed in the body. (1 mark)
For a quick energy release.
Name all the elements found in carbohydrate. (3 marks)
Oxygen, Carbon, Hydrogen.
Name the carbohydrate found: (2 marks)
In fibre,
Used in respiration,
Cellulose
Glucose
Which food provides most energy, (1 mark)
Potatoes, Butter, Cabbage
Butter
Why should your diet contain, (2 marks)
Protein,
Fibre,
Protein- Repair your cells
Fibre - Reduces constipation
Name one example of a vitamin and give its function in the body. (2 marks)
Vitamin D, helps absorb Calcium.
Name one mineral that is needed for healthy bones. (1 mark)
Calcium
Give three uses of water in the body. (3 marks)
- To hydrate cells
- To help regulate your body temperature
- Remove waste products
Why does the body need energy? (1 mark)
To move, to respire, to reproduce.
When testing the energy content of food, suggest one reason why the results might be unreliable. (1 mark)
The heat might conduct down the pin or the pasta might not completely burn out.
Vitamin C indicator. (1 mark)
DCPIP
Equation to calculate BMI.
Weight divided by height [squared]
Kg divided by m2
The small intestines job is to … (1 mark)
Ensure the efficient absorption of digested food particles.
The small intestine is specialised as … (3 marks)
- It has a thin wall, allows food particles to have a short distance to travel from small intestine to blood.
- Permeable membrane stops large insoluble molecules and substances from passing through.
- The rich blood supply allows the maintenance of the concentration gradient between the small intestine and the blood
- The large surface area due to the long length of the intestine and the villi that line that wall increase diffusion.
