Question 1

Reflect on what you did really well in this activity. (Page 154)

Accepted Answer

We increased the exposed area in the case of water in the plate. Water in the bottle had lesser exposed area. It was found that water evaporates faster as the exposed area increases.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Reflect, Really, Activity, Page, A Treat for Mosquitoes, Science. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 2

What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water cycle were unclear to me? (Page 159)

Accepted Answer

We could label some parts of water cycle. It was difficult to distinguish between lake and river water. Also labelling ground water is difficult.Let Us Enhance Our Learning (Pages 161-162)

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Able, Parts, Water, Cycle, Unclear, Page. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Q4: Identify in which of the given processes, evaporation is very important- (i) Colouring with (a)...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 3

Which of the following best describes condensation?
(i) The conversion of water into its vapour state.
(ii) The process of water changing from a liquid into gaseous state.
(iii) The formation of clouds from tiny water droplets.
(iv) The conversion of water vapour into its liquid state.

Accepted Answer

(iv) The conversion of water vapour into its liquid state is called condensation.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Best, Describes, Condensation, Conversion, Water, Vapour. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q4: Identify in which of the given processes, evaporation is very important- (i) Colouring with (a)...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 4

Identify in which of the given processes, evaporation is very important-
(i) Colouring with
(a) crayons
(b) water colours
(c) acrylic colours
(d) pencil colour

Accepted Answer

(b) water colours(ii) Writing on paper with(a) pencil(b) ink pen(c) ball point penAnswer:(b) ink pen

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Processes, Evaporation, Important, Colouring, Crayons, Water. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 5

We see green coloured plastic grass at many places these days. Space around natural grass feels cooler than space around the plastic grass. Can you find out why?

Accepted Answer

Water is lost from the natural grass from the aerial part of the leaves (transportation) and evaporation. Evaporation causes cooling effect.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: See, Green, Coloured, Plastic, Grass, Places. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 6

Give examples of liquids other than water, which evaporate.

Accepted Answer

Milk, oil, whisky, eye drops, sanitizer.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Liquids, Water, Evaporate, A Treat for Mosquitoes, Science. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 7

Fans move air around, creating a cooling sensation. It might seem strange to use a fan to dry wet clothes since fans usually make things cooler, not warmer. Normally, when water evaporates, it requires heat, not cold air. What do you think about this?

Accepted Answer

Blowing fan on wet clothes can fasten the drying process. When you blow air over wet clothes, the moving air helps to increase the rate of evaporation. This happens because the air moving across the wet surface helps to carry away the water vapour that is evaporating from the clothes, creating a drier environment around the clothing.This air-flow helps to reduce the humidity and hence speeds up the rate of evaporation.

Question 8

Usually, when sludge is removed from drains, it is left in heaps next to the drain for 3-4 days. Afterward, it is transported to a garden or a field where it can be used as manure. This approach reduces transportation cost of the sludge and enhances the safety of individuals handling it. Reflect upon it and explain how.

Accepted Answer

Water (moisture) from the sludge evaporates with time making it handling and transportation easier.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Sludge, Removed, Drains, Left, Heaps, Next. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 9

Observe the activities in your house for a day. Identify the activities that involve evaporation. How does understanding the process of evaporation help us in our daily activities?

Accepted Answer

Refer to the text in section 8.5 and 8.6 to understand the examples and process of evaporation in daily life.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Observe, Activities, House, Day, Involve, Evaporation. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ10: How is water present in the solid state in nature?
Q11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 10

How is water present in the solid state in nature?

Accepted Answer

Water in the solid form occurs as ice and snow on the peaks of mountains and in the polar regions such as Antartica.

Source: This question is from A Treat for Mosquitoes, Science &mdash; Class 6, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter A Treat for Mosquitoes: Water, Present, Solid, Nature, A Treat for Mosquitoes, Science. These are fundamental topics in Science that students are expected to master as part of the CBSE Class 6 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberRead the question carefully and identify all parts before answering.
Use the terminology specific to this subject and chapter.
Review the textbook content for this chapter before attempting questions.
Practice writing concise, well-structured answers within time limits.
Related Questions from A Treat for MosquitoesQ11: Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.
Q12: The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?
Q2: What did I do well? Was I able to label all the parts of the water cycle? Which parts of the water...
Q3: Which of the following best describes condensation? (i) The conversion of water into its vapour...
Q4: Identify in which of the given processes, evaporation is very important- (i) Colouring with (a)...
Practice more questions from A Treat for Mosquitoes &mdash; Science, Class 6 CBSE

Question 11

Reflect on the statement “Water is our responsibility before it is our right.” Share your thoughts.

Accepted Answer

Only a small portion of water available on earth is fit for use by plants, animals and humAnswer:Most of the water is available in the oceans which we cannot use directly. We need water for drinking and many other activities. With increasing population the availability of safe water is decreasing. Though it is our right to get water’for our existence but at the same time it is our responsibility to keep water bodies free from pollution.

Question 12

The seat of a two-wheeler parked on a sunny day has become very hot. How can you cool it down?

Accepted Answer

First of all move your two-wheeler into a shade under the tree, then you can keep a wet handerkerchief or cloth on th,e seat so that due to evaporation it gets cooled. Or you can pour cold water on the seat and let it gets evaporated or wipe it out.ActivitiesActivity 8.6 (Page 152)Fill up the blank boxes in Fig. 8.5,(below) marked as A, B, C and 1, 2, 3, 4 for conversion of different states of water using the words—liquid, freezes, evaporates, gas, condenses. Two words have been filled for you.Answer:Conversion of different states of waterNCERT Solutions for Class 6 Science Chapter 8 Body MovementsTopics and Sub Topics in Class 6 Science Chapter 8 Body Movements:Section NameTopic Name8Body Movements8.1Human Body and Its Movements8.2Gait of Animals1. Fill in the blanks:(a) Joints of the bones help in the_____________ of the body.(b) A combination of bones and cartilages forms the_______________ of the body.(c) The bones at the elbow are joined by a______________(d) The contraction of the____________ pulls the   bones  duringAns:(a) movement(b) skeleton(c) hinge(d) muscle2. Indicate ‘true’ and false’ among the following sentences:(a) The movement and locomotion of all animals is exactly the same.(b) The cartilages are harder than bones.(c) The finger bones do not have joints.(d) The fore arm has two bones.(e) Cockroaches have an outer skeleton.Ans:(a) False(b) False(c) False(d) True(e) True3. Match the items in column I with one or more items of column II:Column IColumn II(i) Upper jaw(a) have fins on the body(ii)Fish(b) has an outer skeleton(iii) Ribs(c) can fly in the air(iv) Snail(d) is an immovable joint(v) Cockroach(e) protect the heart(f) shows very slow movement(g) have a streamlined bodyAns:4. Answer the following questions:(a) What is a ball and socket joint?(b) Which of the skull bones are movable?(c) Why can our elbow not move backwards?Ans:(a) The rounded end of one bone fits into the hollow space of other bone. This is called ball and socket joint. Ball and socket joints allow movements in all the directions, e.g. shoulder and hip can be moved in all directions.(b) In skull, only lower jaw is movable.(c) Our elbow cannot move backwards because the elbow has a hinge joint that allows movement in only one direction.Class 6 Science Chapter 8 VERY SHORT ANSWER TYPE QUESTIONS1. What do you mean by movement?Ans:  The changing position of the body or any part of the body is called movement.2. At which part does the arm rotate?Ans: The arm rotates on the round pit-like structure.3. If you tie a scale with your arm, are you able to bend your elbow?Ans: No, we cannot bend our elbow.4. Name the places where two parts of the body are seen to be joined together.Ans: These places are called joint.5. If there are no joints then will it be possible to move?Ans: No, it is not possible.6. Can bones be bent?Ans:  No, bones cannot be bent.7. Can we bend our body at every part?Ans: No, we can bend our body only at joints.8. How many types of joints are there?Ans: There are five types of joints in our body.9. Name the various types of joint.Ans:(i) Ball and socket joints(ii) Pivotal joints(iii) Hinge joints(iv) Fixed joints(v) Gliding joints10. What is cavity in bone?Ans:  The hollow space in the bone is called cavity.11. Give two examples of ball and socket joint.Ans:(i) Joint of upper arm and shoulder.(ii) Joint of thigh and the hip.12. Give an example of pivotal joint.Ans. The joint of skull with backbone.13. Give two examples of hinge joints.Ans:(i) Joints in fingers(ii) Joints in knee14. Give an example of fixed joint.Ans: Joint of cranium skull.15. Give an example of gliding joint.Ans: The joint in backbone.16. What is skeleton?Ans: The framework of bones in our body is called skeleton.17. What are ribs?Ans: The bones of the chest are called ribs.18. What is rib cage?Ans: Ribs are joined with backbone to form a box. This box is called rib cage.19. What are shoulder bones?Ans: The shoulder bones are formed by the collar bone and the shoulder blade. It connects the upper part of the chest and bones of the arm.20. What are pelvic bones?Ans: The bones which enclose the body part below the stomach are called pelvic bones.21. What are cartilages?Ans: Some additional parts of the skeleton which are not as hard as bones and are elastic in nature and can be bent are called cartilages, e.g. cartilage of ear.22. Name the three components of skeleton.Ans: Skeleton is made up of many bones, joints and cartilage.23. Name the parts of the body which help in movement.Ans: Contraction and relaxation of muscles and bones and joints help in movement.24. Name two animals which move without bones.Ans: (i) Earthworm      (ii) Snail25. Give an example of animal which can walk, climb and fly in the air.Ans: Cockroaches.26. Name the organ in cockroach which helps in walking.Ans: The three pairs of legs in cockroach help in walking.27. Which part of the cockroach help in flying?Ans: There are two pairs of wings attached to the breast which help them in flying.28. Name a bird which can swim in water.Ans. Duck.29. What do you mean by streamlined?Ans: If the body tapers at both the ends then such, shape of the body is said to be streamlined.30.How does the snake move?Ans: Snakes have a long backbone and many thin muscles which help in the movement. The snake’s body curves into many loops. Each loop of the snake gives it a forward push by pressing against the ground.31. What do you mean by fractured bone?Ans: Fractured bone means broken bone.32. Why are fractured bones plastered?Ans. Plaster keeps broken bones at their right place so that they grow and join properly.33. Name organs that are protected by the rib cage?Ans: Heart and Lungs.34. Why do we need two muscles together to move a bone?Ans: A muscle can only pull, it cannot push. Thus, two muscles are required to work together to move a bone. When one muscle contracts, the bone is pulled. When another muscle of the pair pulls, it brings the bone in its original position.35. Name three animals that have streamlined body.Ans: Fish, Birds, Snake.36. Many people suffer from a problem called arthritis. Explain its connection with movement.Ans: Arthritis is the pain in joints. With this problem people find difficulty in moving from one place to another.37. How is a bird’s body adapted for flying?Ans: The following adaptations are seen in the body of birds.(i) Bones are hollow.(ii) Forelimbs are modified into wings.(iii) Body is streamlined.Class 6 Science Chapter 8 SHORT ANSWER TYPE QUESTIONS1. What are joints? Write the names of various types of joints.Ans: The places where two parts of the body seem to be joined together are called joints. There are following types of joints:Ball and socket jointsPivotal jointsHinge jointsFixed jointsGliding joints2. What is skeleton? Draw a diagram to show the human skeleton.Ans: The bones in our body form a framework to give a shape to the body. The framework is called skeleton3. Write two ways by which we may know the shape of human skeleton.Ans:(i) We can know the shape of skeleton by feeling.(ii) We could know the shape by X-ray images of human body4:Write the differences between bones and cartilage.Ans:BoneCartilage(i) They are hard.(i) They are soft.(ii) They cannot bend.(ii) They can bend.(iii) They are used to make the framework of whole body.(iii) They help to make some parts of the body.5. How do the muscles work?Ans: The muscles work in pairs. When one of them contracts, the bone is pulled in that direction, the other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, while the first relaxes.A muscle can only pull. It cannot push.6. How does the earthworm move?Ans:  Earthworm does not have bones. It has muscles. During the movement, earthworm first extends front part of the body keeping the rear portion fixed to the ground. Then it fixes the front and releases the rear end. It then shortens the body and pulls the rear end forward. In this way by repeating such muscular expansions and contractions earthworm moves.7. How does the snail move?Ans: The rounded structure on the back of the snail is called shell. It is the outer skeleton (exoskeleton) of snail. When it starts moving a thick structure and the head of the snail may come out of an opening in the shell. The thick structure is called foot, which is made up of strong muscles. It helps snail in moving.8. How does fish move in water?Ans: The body of fish is streamlined. The streamlined shape helps the fish to move in water. The skeleton of fish is covered with muscles which make the front part of the body to curve to one side and the tail part swings towards the opposite side. This makes a jerk and pushes the body forward. In this way it moves in water.Class 6 Science Chapter 8 LONG ANSWER TYPE QUESTIONS1. Explain various kinds of joints found in our body and give example of each.Ans: There are five types of joints in our body:(i) Fixed joints: Those joints which do not allow movement are called fixed joint.(ii) Ball and socket joint: This joint allows movement in all directions. The rounded end of one bone fits into the hollow space of other bone. For example, joint between upper arm and shoulder.(iii) Pivotal joint: This type of joint allow movement in all planes, i.e. up and down, side and other planes. For example, head.(iv) Hinge joint: The joint which allows movement only in one plane is called hinge joint. For example, fingers, knees.(v) Gliding joint: These joints allow only a limited amount of movement of sliding nature of cartilage. For example, the joints of backbone.NCERT Solutions for Class 6 Science– All ChaptersChapter 1 The Wonderful World of ScienceChapter 2 Diversity in the Living WorldChapter 3 Mindful Eating: A Path to a Healthy BodyChapter 4 Exploring MagnetsChapter 5 Measurement of Length and MotionChapter 6 Materials Around UsChapter 7 Temperature and its MeasurementChapter 8 A Journey through States of WaterChapter 9 Methods of Separation in Everyday LifeChapter 10 Living Creatures: Exploring their CharacteristicsChapter 11 Nature’s TreasuresChapter 12 Beyond Earth