Category: Class 6

NCERT Solutions for Class 6 Science Chapter 6 Changes Around Us

Topics and Sub Topics in Class 6 Science Chapter 6 Changes Around Us

Class 6 Science Chapter 6 Textbook Questions Solved

1. To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?
Ans: Yes, it can be reversed by unfolding the dress.

2. You accidentally dropped your favourite toy and broke it. This is a change you did not want. Can this change be reversed?
Ans: No, this change (breaking of toy) cannot be reversed.

3. Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

4. A drawing sheet changes when you draw a picture on it. Can you reverse this change?
Ans: No, we cannot get fresh drawing sheet once a picture is drawn on it with paint/ oil or water. However, we can reverse the change, if soft pencil is used to draw the picture.

5. Give examples to explain the difference between changes that can or cannot be reversed.
Ans: Examples of reversible and irreversible changes

6. A thick coating of a paste of Plaster of Paris (POP) is applied over the bandage on a fractured bone. It becomes hard on drying to keep the fractured bone immobilised. Can the change in POP be reversed?
Ans: No, the change in POP cannot be reversed since it is a chemical change.

7. A bag of cement lying in the open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the changes, which have occurred in the cement, could be reversed?
Ans. No, these are irreversible chemical changes.

EXTRA QUESTIONS for Class 6 Science Chapter 6

Class 6 Science Chapter 6 VERY SHORT ANSWER TYPE QUESTIONS

1. Give two examples of slow changes.
Ans:
(a) Growing of plants
(b) Ripening of fruits.

2. Give two examples of fast changes.
Ans:
(a) Blowing of balloon
(b) Rolling out roti from dough ball.

3. Give two examples of reversible changes.
Ans:
(a) Drying of wet clothes
(b) Heating of milk.

4: Give two examples of irreversible changes.
Ans:
(a) Milk to cheese
(b) Cooking of food.

5. Can you say deforestation is an irreversible or reversible change?
Ans: It is an irreversible change.

6. Does the size of the paper change after making an aeroplane by folding it or by cutting it?
Ans: Yes.

7. Can you change the shape of a eraser after erasing?
Ans: Yes.

8. Why does a blacksmith heat the metal rim to fix it on a cart wheel?
Ans: A blacksmith heats the metal rim to fix it onto a cart wheel because a metal rim is made slightly smaller. On heating, the rim expands and fits onto the wheel. Then on cooling, the rim contracts and fits tightly onto the wheel.

9. What are slow and fast changes? Give examples.
Ans: The changes which take place in a long period of time are called slow changes whereas that changes which take place in a short period of time are called fast changes.
Examples:
(a) Rusting of iron, formation of day and night, ripening of fruits, growing of trees are slow changes.
(b) Burning of paper, stretching of rubber band, blowing of balloons, bursting of crackers are fast changes.

10. Classify the following into slow and fast changes:
(i) Spinning of top
(ii) Formation of day and night
(iii) Formation of curd from milk
(iv) Change of season
(v) Making curd from milk by adding lemon juice.
Ans:
(i) Fast change
(ii) Slow change
(iii) Slow change
(iv) Slow change
(v) Fast change.

11. Classify the following as slow or fast change:
(i) Bearing of heart
(ii) Change of seasons
(iii) Burning of paper
(iv) Weathering of rocks
(v) Melting of wax
(vi) Cooking of food
(vii) Burning of wax
(viii) Melting of ice cream
(ix) Curding of milk
(x) Formation of day and night
Ans:
(i) Fast
(ii) Slow
(iii) Fast
(iv) Slow
(v) Fast
(vi) Slow
(vii) Fast
(viii) Fast
(ix) Slow
(x) Slow

12. Write some changes happening in our body.
Ans:
(a) Our nails grow
(b) Our hair grows
(c) We grow taller
(d) Our weight increases.

 13. Some common changes are given in Table 6.1. Which of these changes do you think can be reversed?

Class 6 Science Chapter 6 SHORT ANSWER TYPE QUESTIONS

1. What is a physical change? Explain with example.
Ans: The changes in which only physical properties of substances are changed and no new substance is formed is called physical change. It is a reversible change. Example: Boiling and freezing of water.

2. What is a chemical change? Explain with example.
Ans: The changes in which new substance with new chemical properties are formed are called chemical changes.
Example: Reaction between washing soda and lemon juice in which C0₂ and other substances are formed.

3. What happens when sugar is heated?
Ans: When sugar is heated continuously then a black powdery substance is formed. This is a chemical change.

Class 6 Science Chapter 6 LONG ANSWER TYPE QUESTIONS

1. Explain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
Ans: The metal rim is always made slightly smaller than the wooden wheel. The metal rim is heated. On heating, the rim expands and fit onto the wheel. Cold water is then poured over the rim. Due to cooling the metal rim contracts and fits tightly onto the wheel.

2. How does curd being set? Is this change reversible?
Ans: A small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours, the milk changes into curd.
Curd formed from milk cannot be changed into milk again. So, this an irreversible (cannot be reversed) change.

NCERT Solutions

NCERT Solutions for Class 6 Science Chapter 1 Food Where Does It Come From

The topics and Sub Topics in Class 6 Science Chapter 1 Food Where Does It Come From:

Class 6 Science Chapter 1 Textbook Questions Solved

Q. 1. Do you find that all living beings need the same kind of food?
Ans. No, all living beings do not need same kind of food.

Q.2. Name five plants and their parts that we eat.
Ans. The names of five plants and their parts that we eat are:
(i) Paddy: seeds
(ii) Wheat: seeds
(iii) Mustard plant: seeds and leaves
(iv) Brinjal plant: fruits
(v) Potato plant: stems

Q. 3. Match the items given in column A with those in column B.

Q. 4. Fill up the blanks with the words given:
herbivore, plant, milk, sugarcane, carnivore.
(a) Tiger is a__________ because it eats only meat.
(b) Deer eats only plant products and so is called______________ .
(c) Parrot eats only__________
(d) The_________ that we drink, which comes from cows, buffaloes and goats is
an animal product.
(e) We get sugar from___________ .
Ans. (a) carnivore                                   (b) herbivore                 (c) plant
(d) milk                                     (e) sugarcane

Extra Questions for Class 6 Science Chapter 1

Class 6 Science Chapter 1 VERY SHORT ANSWER TYPE QUESTIONS

Q. 1. Give two examples where two or more parts of a single plant are used as food.
Ans. Mustard — seeds and leaves,
Pumpkin — fruit and flowers.

Q.2. Name any one plant that grows in water and is eaten as food.
Ans. Lotus — Stem of lotus is eaten as food.

Q.3. Suggest any three ways you can think of to avoid wastage of food.
Ans. (i) Avoid leaving food uneaten in meals.
(ii) “Eat to live” and not “live to eat” — excess eating should be avoided.
(iii) Raw food like pulses, grains should be stored properly.

Q.4. Name two sugar producing plants.
Ans. (a) Sugarcane                                           (b) Sugarbeet.

Q.5. Name a non-green plant that we eat.
Ans. Mushroom.

Q.6. What do you call the habit of an individual to eat a particular type of food items commonly?
Ans. Food habit.

Q.7. Compare your food habits with food habits of your friend who lives in Tamil Nadu.
Ans. My food habit: Chapatti, pulses, lassi, rice, vegetables, mustard oil.
Food habit of my friend: Idli, dosa, sambhar, bara, rasam, upma and coconut oil, etc.

Q.8. What items are used to prepare cooked rice?
Ans. Raw rice and water.

Q.9. Study the ingredients of various food items. Do they have some common food ingredients?
Ans. Yes, they have some common ingredients like: water, salt and oil or ghee.

Q.10. What are the two common sources of most of the ingredients of food items?
Ans. (i) Plants                                                  (ii) Animals

Q.11. Name the three products each provided by plants and animals.
Ans. Plant products: Grains, cereals and vegetables.
Animal products: Milk, egg and meat.

Q.12. Name three edible (eatable) parts of plants.
Ans. (i) Roots                                        (ii) Fmits                                (iii) Leaves

Q.13. Which part of the plants do we eat generally?
Ans. We generally eat fruits of many plants.

Q. 14. Which type of seeds give more energy, sprouted seeds or normal seeds?
Ans. Sprouted seeds give more energy than normal seeds.

Q.15. What is honey? 
Ans. A sweet substance (liquid) prepared by bees from the riectar, i.e., sweet juice collected from flowers is called honey.

Q.16. Where would you place human beings on the basis of food that they eat?
Ans. Omnivores.

Class 6 Science Chapter 1 SHORT ANSWER TYPE QUESTIONS

Q.l. What is food?
Ans. The eatable substances eaten by humans and other animals to get energy for various activities for growth and development is called food.

Q.2. Why should we eat cooked food?
Ans. We should eat cooked food because by cooking we can kill harmful germs and make it germless. Cooked food can be easily digested and absorbed by our body. Cooking also improves the taste of food.

Q.3. Explain the importance of food for living organisms.
Ans. Importance of food is:
(i)  It provides energy to do various activities.
(ii) It helps in growth.
(iii) It helps to repair and replace damaged parts of the body.
(iv) It protects us from infections and diseases.

Q.4.  Explain the various sources of food items and ingredients with the help of examples.
Ans.  There are mainly two sources of ingredients of various food items:
(i) Plants: Plants provide us fruits, vegetables, pulses, grains, cereals, etc.
(ii) Animals: Animals provide us milk, eggs, meat etc.

Q.5. Define the term herbivores.
Ans. The animals which eat only plants or plant products are called herbivores. For example, cow, goat and buffalo.

Q.6. What are carnivores? Explain with examples.
Ans. The-animals which eat other animals are called carnivores. For example, lion and tiger. Carnivores generally eat herbivores and other carnivores.

Q.7. Define the term omnivores.
Ans. The animals which eat both the plants and animals are called omnivores. For example, cat, dog and human beings.

Class 6 Science Chapter 1 LONG ANSWER TYPE QUESTIONS

Q. 1. With the help of a flow chart show various contributors involved when we eat a chapatti.

Q.2. Make flow charts for the preparation of honey and ghee.
Ans. Preparation of honey:

Q. 3. Differentiate between herbivores, carnivores and omnivores. Give two examples of each

Q. 4. (i) Name the different parts of a banana plant that are used as food.
(ii)  Animal food we get from water resources.
(iii) Four fruits which we eat as vegetables.
Ans. (i) Flower, fruit and stem of banana.
(ii) Fish, prawn, lobustar and crabes.
(iii) Fruits of tomato, brinjal, Ladyfinger (bhindi), cucumber (Loki).

NCERT Solutions