AP State Syllabus AP Board 7th Class Science Solutions Chapter 1 Food Components Textbook Questions and Answers.
AP State Syllabus 7th Class Science Solutions 1st Lesson Food Components
7th Class Science 1st Lesson Food Components Textbook Questions and Answers
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Make a list of food items eaten during lunch by you. Try to mention the components in each food item.
The following food items are eaten by me during lunch. The components in each food item are also given. The percentage of these components may vary from one food item to another.
Manjula eats only bread and omelette daily. Do you think it is a balanced diet? Why? or why not?
- Bread and omelette can not be called as balanced diet.
- Balanced diet contains all food components every day in adequate quantity.
- Diet containing food items having more of carbohydrates and proteins along with a little fat, vitamins and minerals makes a balanced diet.
Make a list of food items that contain all components of food.
- If we can eat dal, rice, rotis, green vegetables, little oil and jaggery all the food requirements of the body are fulfilled.
- The above foods should be cooked in a proper way.
Who am I?
a) I am a component of food that makes paper translucent.
b) Put a drop of me on a cut potato. It turns dark blue. Who am I?
a) Oil makes paper translucent.
b) Dilute iodine solution drop on a cut of potato turns it dark blue or black.
Explain what will happen if we do not include roughage in our food.
- Roughages are a kind of carbohydrate that our body fails to digest.
- They help in free bowel movement in the digestive tract and prevent constipation.
Test the given food items and record the type of components that are present in them. (Groundnut, cooked dal, pulusu).
- Take a small quantity of groundnuts. Rub them gently on a piece of paper.
- The paper turns translucent, so groundnut contains fats.
- Some groundnuts are taken. They are grinded to powder and the powder is taken in a test tube.
- 10 drops of water is added to the powder in the test tube.
- 2 gms. of copper sulphate is dissolved in 100 ml of water. We get 2% copper sulphate solution.
- 10 gms. of sodium hydroxide is dissolved in 100 ml. of water. We get 10% sodium hydroxide solution.
- 2 drops of 2% copper sulphate solution and 10 drops of 10% sodium hydroxide solution are added to the groundnut solution already prepared.
- The colour of the solution changes to purple confirming the presence of protein in groundnut.
2. Cooked Dal:
- A sample of cooked dal solution is taken.
- 10 drops of this solution is taken in a test tube.
- 2 drops of 2% copper sulphate solution and 10 drops of 10% sodium hydroxide solution are added to the dal solution taken in the test tube.
- The colour of the solution changes to purple confirming the presence of protein in cooked dal.
- This test confirms the presence of proteins in larger amounts as compared to others.
- A sample pulusu solution is taken in a test tube.
- If a drop of it is put on a paper, the paper becomes translucent confirming the presence of fat in pulusu.
- It responds to protein test and starch test.
- Pulusu is a mixture of all these components of food.
Draw some food items of your diet and explain why you like them.
- These are the food items I like for breakfast.
- These are tasty and smaller amounts give enough energy to maintain the strength of the body till lunch.
- These items contain carbohydrates, proteins, fibres and fats (in some items) all of which make them near balanced diet.
- These are some of the food items of my diet and I like them because they make a balanced diet.
- Combination of the items mentioned in the flow chart makes the food very tasty.
- This diet contains carbohydrates, proteins, fats, minerals and vitamins also.
- These food items not only give strength to the body and mind but also help in the growth of some body parts.
- In growing children this diet supports their growth also.
If you were invited to a party with many food items in the menu like Rice, Roti, Puri, Idly, Dosa, Samosa, Dal, Green Salad, Vegetable Curry, Fruit Chat, Chicken Curry, Eggs, Gulab Jamun.
a) What food items would come on to your plate to make your diet a balanced one?
b) What food items would you take plenty, adequately?
a) To make my diet a balanced one, the following food items would come to my plate.
- A diet containing all the nutrients and other components in proper proportion is called balanced diet. So rice, roti, dal, vegetable curry, fruit chat, chicken curry would come to my plate.
- I take the following food items in plenty. Vegetable curry, fruit chat, green salad.
- I take the following food items adequately. Dal, dosa, idly etc.
How is water useful to our body?
- Water helps the food to move easily in the digestive tract.
- Water helps in many other processes in our body as well.
- So we must drink plenty of water.
Fill in the blanks.
a) If our food is not balanced with proper nutrients we may ——–.
b) Fibres in our diet prevents ——–.
c) Our daily diet should include plenty of ——–.
d) Oils and fats give us ——–.
a) lose the resistive power of our body
c) fruits and leafy vegetables.
Match the following and give the reasons.
- Fibre of food causes weight to food and also makes bulk forming.
- Protein is a body building material which construct new cells.
- Vitamins & minerals are called Micro-nutrients.
- Carbohydrates which release chemical energy during oxidation.
Prepare a balanced diet chart with the help of your group and exhibit in your classroom science fair.
For a balanced diet the following food items are important.
- Lady’s finger
- Tomato etc.
Prepare ‘kichidi’ with your mother’s help using all kinds of available vegetables, dais, nuts etc. Write a note on the process of making kichidi.
- A dish is taken.
- Suitable quantities of beaten rice, groundnut seeds, bengal gram dal are all taken in the dish. Available vegetables are taken and cut into pieces. Sufficient number of pieces are also added in the dish.
- The mixture is fried by putting oil and keeping it on the flame of a stove.
- After the mixture is fried it is transferred into a vessel.
- Again the dish is taken and sufficient amounts of mustard, cumin seeds, pieces of chilli are put in it.
- A small piece of asafoetida is also added to the contents in the dish.
- Sufficient oil is taken in another dish and is heated by putting the dish on the flame of the stove.
- When oil is heated to the desired temperature, the contents in the dish are put in the oil.
- Wait till the contents are fried well.
- Remove the contents and mix them with the mixture already stored in the vessel.
- The total mixture of all the components is ‘kichidi’.
Observe whether your mother cooks on a low or high flame. Discuss with your mother and find out the reason.
- My mother cooks on a low flame.
- The reason is the nutritional values of the food will be dried up if cooked on a high flame.
- Micro-nutrients also disappear. So cooking is done of low flame only.