Let us enhance our learning
Q1: Pick the odd one out and give reasons:
(i) Jowar, Bajra, Ragi, Chana
(ii) Kidney beans, Green gram, Soya bean, Rice
Ans: (i) Jowar, Bajra, Ragi, Chana
Odd one out: Chana
Reason: Jowar, Bajra, and Ragi are all types of millets, whereas Chana (chickpea) is a pulse.
(ii) Kidney beans, Green gram, Soya bean, Rice
Odd one out: Rice
Reason: Kidney beans, Green gram, and Soya bean are all pulses, whereas Rice is a cereal.
Q2: Discuss traditional versus modern culinary practices in India.
Ans: Traditional practices involved cooking on chulhas using firewood and grinding spices using sil-batta. Modern practices use gas stoves, electric grinders, and other kitchen appliances. The change is due to technological advancements, improved transportation, and convenience.
Q3: A teacher says that good food may act as medicine. Ravi is curious about this statement and has some questions for his teacher. List at least two questions that he can ask.
Ans:
- How does consuming certain foods help in curing diseases?
- Can you give examples of foods that act as natural medicine?
Q4: Not all delicious foods are necessarily healthy, while not all nutritious foods are always enjoyable. Share your thoughts along with a few examples.
Ans: Delicious foods like candy bars and carbonated drinks are often high in sugar and fats but low in nutrients. Nutritious foods like spinach and broccoli may not be as enjoyable but are essential for good health. Balancing taste and nutrition is key to a healthy diet.
Q5: Medu does not eat vegetables but enjoys biscuits, noodles, and white bread. He often has stomach ache and constipation. What changes should he make in his diet to get rid of these problems? Explain your Ans.
Ans: Diet changes for Medu: Add more vegetables and fruits for fiber, include whole grains like whole wheat bread and brown rice, and opt for healthy snacks such as nuts and seeds.
Explanation: Vegetables and whole grains are rich in dietary fiber, which aids digestion and helps prevent constipation. Cutting down on processed foods like biscuits and white bread can also improve stomach health.
Q6: Reshma had trouble seeing things in dim light. The doctor tested her eyesight and prescribed a particular vitamin supplement. He also advised her to include a few food items in her diet.
(i) Which deficiency disease is she suffering from?
(ii) Which food component may be lacking in her diet?
(iii) Suggest some food items that she should include in her diet to overcome this problem (any four).
Ans:
(i) Deficiency disease: Night blindness
(ii) Lacking food component: Vitamin A
(iii) Suggested food items: Papaya, Carrot, Mango, Milk
Q7: You are provided the following:
(i) Canned fruit juice
(ii) Fresh fruit juice
(iii) Fresh fruit
Which one would you prefer and why?
Ans: Fresh fruit is preferred as it provides the most nutrients, fiber, and is free from added sugars and preservatives found in canned or processed juices.
Q8: Gourav got a fracture in his leg. His doctor aligned the bones and put on a plaster. The doctor also gave him calcium tablets. On the second visit, the doctor gave him Vitamin D syrup along with calcium tablets.
(i) Why did the doctor give calcium tablets to Gourav?
(ii) On the second visit, why did the doctor give Vitamin D syrup along with calcium tablets?
(iii) What question arises in your mind about the choices made by the doctor in giving the medicines?
Ans:
(i) Reason for calcium tablets: Calcium tablets help in bone healing and strengthening.
(ii) Reason for Vitamin D syrup: Vitamin D aids in the absorption of calcium in the body.
(iii) Question: Why is Vitamin D necessary for calcium absorption?
Q9: Sugar is an example of carbohydrates. Sugar is tested with iodine solution but it does not change to blue-black color. What can be a possible reason?
Ans: Sugar is a simple carbohydrate, while starch is a complex carbohydrate. Iodine reacts with starch, causing it to turn blue-black, but it does not react with simple carbohydrates like sugar.
Q10: What do you think of Raman’s statement, “All starches are carbohydrates but not all carbohydrates are starches.” Describe the design of an activity to test your Ans.
Ans: Raman's statement is correct. Raman's statement suggests that while all starches are carbohydrates, not all carbohydrates are starches. To test this, gather samples such as sugar, rice, and potatoes. Add iodine solution to each sample. If the sample turns blue-black, it contains starch. Only starches will show this color change, while other carbohydrates, like sugar, will not react the same way. This shows that not all carbohydrates are starches.
Q11: While using iodine in the laboratory, a few drops of iodine fell on Mishti’s socks and a few fell on her teacher’s saree. The drops of iodine on the saree turned blue-black while the color on the socks did not change. What can be a possible reason?
Ans: The saree may contain starch or be made of natural fibers that react with iodine, while the socks may be synthetic and do not contain starch.
Q12: Why are millets considered a healthy choice of food? Can eating just millets suffice for the nutritional requirements of the body? Discuss.
Ans: Millets are a healthy food choice because they are nutritious grains packed with vitamins, minerals like iron and calcium, and dietary fibers. They support normal body functions and contribute to a balanced diet. However, relying solely on millets is not enough to meet all nutritional needs, as a balanced diet requires a variety of foods to provide all essential nutrients such as proteins, fats, vitamins, and minerals.
Q13: You are given a sample of a solution. How would you check the possibility of it being an iodine solution?
Ans: To find out if a solution is iodine, do a starch test. Get a piece of food that has starch, like a slice of potato or bread. Put a few drops of the solution on the food. If the solution is iodine, it will turn blue-black when it reacts with the starch. This color change shows that the solution is iodine.
