PART-A : Textual Questions and Answers
Questions and activities appearing inside the lesson
Page 220 – Observe the Picture
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1. What is the teacher showing in the picture?Ans: The teacher is showing a picture of the human body and its organs.
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2. Can you say the names of some organs of our body?Ans: Some organs of our body are the brain, heart, lungs, liver and kidneys.
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3. What are the uses of organs?Ans: Organs are useful for us to do different kinds of work.
Page 224 – Let Us Discuss
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4. Which part of our body helps to digest the food?Ans: The digestive system helps to digest the food.
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5. Why did Rohit get tired after dancing?Ans: Rohit got tired because he used energy while dancing.
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6. How did eating bananas help Rohit?Ans: Eating bananas gave Rohit energy, so he could begin dancing again.
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7. What would happen if Rohit did not eat anything and continued dancing? Why?Ans: Rohit would become very tired and weak because his body would not get enough energy from food.
Page 226 – Digestive System
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8. What happens to the food we eat?Ans: The food we eat is digested. Complex food is changed into simple and absorbable materials by the action of enzymes.
Page 228 – Activity
Write the functions of different parts of the digestive system.
| S.No. | Part | Function |
|---|---|---|
| 1 | Mouth | Chews the food into smaller pieces and mixes it with saliva. |
| 2 | Oesophagus | Carries the swallowed food from the mouth to the stomach. |
| 3 | Stomach | Mixes the food with digestive juices and makes it more liquid. |
| 4 | Small Intestine | Digestion continues here and digested nutrients are absorbed into the blood. |
| 5 | Large Intestine | Absorbs water from the undigested food. |
| 6 | Rectum | Stores the remaining waste. |
| 7 | Anus | Releases the waste from the body. |
Page 230 – Look at the Given Picture
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9. What do you observe in the picture?Ans: I observe a doctor examining a child.
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10. What is the doctor doing?Ans: The doctor is measuring the child's heartbeat.
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11. What do you call the apparatus with which the doctor is testing the patient?Ans: The apparatus is called a stethoscope.
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12. How is the sound produced? Where does the sound come from? Why?Ans: The sound comes from the heartbeat. The beating heart produces the heartbeat sound, which can be heard through a stethoscope.
Page 234 – Let Us Discuss
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13. Which blood vessels transport the blood from the heart to all parts of the body?Ans: Arteries transport blood from the heart to all parts of the body.
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14. Which blood vessels transport the blood from the body parts to the heart?Ans: Veins transport blood from the body parts back to the heart.
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15. What is the instrument used by the doctor to measure heartbeat?Ans: A stethoscope is used by the doctor to listen to the heartbeat.
Page 236 – Nervous System
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16. While walking along the road, we hear the sound of a bus horn. We immediately move aside. How are we able to move immediately after listening to the sound?Ans: The ears receive the sound and the nerves send the message to the brain. The brain processes the message and sends instructions through the nerves to the body parts, helping us move aside quickly.
Page 234 – Complete the Following Table
| S.No. | Who am I? | What do I do? |
|---|---|---|
| 1 | Heart | Pumps blood through the blood vessels to all parts of the body. |
| 2 | Blood Vessels | Carry blood throughout the body. |
| 3 | Blood | Transports oxygen and nutrients to all parts of the body. |
PART-B : Improve Your Learning
Textbook Questions – Pages 240–242
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1. Name the organ systems in the human body.
Ans: The organ systems discussed in this lesson are the skeletal, digestive, respiratory, circulatory, excretory and nervous systems.
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2. Write the name of the organ that pumps blood.Ans: Heart.
- 3. Which organ system is responsible for the movement of our body?
Ans: The skeletal system, together with muscles, helps in the movement of our body.
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4. What is the human body's nervous system primarily responsible for? ( D )Ans: D) Transmitting signals
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5. How does the respiratory system help our body?Ans: The respiratory system helps us take in oxygen. Oxygen helps break down food inside our cells and releases energy for our body.
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6. Why do we need the circulatory system?Ans: We need the circulatory system to transport blood, oxygen and nutrients to all parts of the body.
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7. Explain why all organ systems must work together.Ans: All organ systems must work together because each system performs an important function. Together they help our body work properly, stay healthy and remain alive.
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8. Which organ system is shown in the above picture and what is its main function? ( B )Ans: B) Digestive system – breaking down food
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9. After eating food, what happens to the food inside your body? Name the system involved.Ans: The food is digested and changed into simple, absorbable materials. The digestive system is involved.
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10. Place your hand on your chest and feel your heartbeat. Which organ are you feeling, and what is its function?Ans: We are feeling the heart. Its function is to pump blood through the blood vessels to all parts of the body.
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11. Riya runs for 2 minutes and notices that her breathing becomes faster and her heart beats quicker. Which two organ systems are mainly working harder? ( C )Ans: C) Respiratory and circulatory systems
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12. Match the following.
No Organ Ans Organ System 1 Heart ( B ) A) Nervous system 2 Lungs ( C ) B) Circulatory system 3 Stomach ( D ) C) Respiratory system 4 Brain ( A ) D) Digestive system -
13. Compare the digestive system and respiratory system. Write one difference.Ans: The digestive system digests food, whereas the respiratory system helps us take in oxygen and release carbon dioxide.
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14. What may happen if one organ system does not work properly? Explain with one example.Ans: If one organ system does not work properly, the normal functioning of the body may be affected. For example, if the digestive system does not work properly, the body may not get enough nutrients and energy.
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15. Is it important to eat healthy food for the proper working of organ systems? Why?Ans: Yes. Healthy food provides the nutrients and energy needed for the proper functioning of our body and organ systems.
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16. Do you agree that our body is an amazing machine? Give one reason.Ans: Yes. Our body is an amazing machine because all its organ systems work together to keep us alive, healthy and active.
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17. Write two sentences appreciating how different organ systems work together.Ans: Different organ systems work together to perform different functions of the body. Their combined work helps us live, grow and stay healthy.
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18. Prepare a short slogan on “Taking care of our body”.Ans: “Eat healthy, stay active, keep your body happy!”
PART-C : Additional Questions and Answers
Additional practice questions based on Lesson 4
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1. What is an organ system?Ans: A group of organs working together to perform a common work is called an organ system.
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2. What are external organs?Ans: External organs are the organs that are visible to us from outside the body, such as the head, hands and legs.
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3. What are internal organs?Ans: Internal organs are organs located inside the body and not visible from outside, such as the brain, heart, lungs, liver and kidneys.
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4. How many bones are there in an adult human body?Ans: There are 206 bones in an adult human body.
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5. Which is the longest bone in the human body?Ans: The femur or thigh bone is the longest bone in the human body.
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6. Which is the shortest bone in the human body?Ans: The stapes in the middle ear is the shortest bone in the human body.
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7. What protects the brain?Ans: The skull protects the brain.
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8. What protects the heart and lungs?Ans: The ribcage gives protection to the heart and lungs.
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9. What is digestion?Ans: Digestion is the process of converting complex food material into simple and absorbable materials by the action of enzymes.
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10. What is inhalation?Ans: The process of breathing in air is called inhalation.
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11. What is exhalation?Ans: The process of breathing out air is called exhalation.
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12. Name the two types of blood vessels.Ans: The two types of blood vessels are arteries and veins.
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13. How many chambers does the heart have?Ans: The heart has four chambers.
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14. Name the three major excretory organs mentioned in the lesson.Ans: The three major excretory organs are the kidneys, lungs and skin.
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15. What is the function of the kidneys?Ans: The kidneys filter the blood and remove impurities from it. These impurities are sent out in the form of urine.
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16. What is the function of the nervous system?Ans: The nervous system controls the body through the brain, spinal cord and nerves and helps us respond to different messages.
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17. Fill in the blank: The heart makes the sound “________”.Ans: lub-dub
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18. Fill in the blank: The process of breathing in air is called __________.Ans: inhalation
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19. True or False: The small intestine is about 6 metres long.Ans: True.
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20. True or False: Veins carry blood from the heart to all parts of the body.Ans: False. Arteries carry blood from the heart to all parts of the body.
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21. Write any three ways to keep your body healthy.Ans:
1. Eat healthy food.
2. Exercise regularly.
3. Drink enough water and keep the body clean. -
22. Why should we avoid junk food?Ans: We should avoid junk food because it can harm our digestive system.
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23. Why should we chew food slowly and properly?Ans: We should chew food slowly and properly because digestion starts in the mouth and chewing makes the food easier to digest.
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24. What instrument is used to listen to the heartbeat?Ans: A stethoscope.
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25. Write the names of any five organ systems in our body.Ans: Skeletal system, digestive system, respiratory system, circulatory system and nervous system.
Our Body – Our Organ System
Additional practice questions based on the concepts covered in the lesson.
PART-D1 : Multiple Choice Questions
Choose the correct answer.
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1. A child falls while playing and injures the head. Which organ is mainly protected by the skull?
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2. Rohan eats food and the food passes through the oesophagus before reaching the stomach. What is the main function of the oesophagus?
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3. Which organ system helps the body obtain energy from food by supplying oxygen?
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4. Which of the following is NOT a part of the circulatory system?
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5. A person runs quickly for a few minutes. His breathing becomes faster and his heart beats faster. Which two systems are mainly involved?
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6. Which organ removes impurities from the blood and sends them out in the form of urine?
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7. Which statement is correctly matched?
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8. A doctor listens to a patient's heartbeat using a particular instrument. What is the instrument?
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9. Which of the following pairs is NOT correctly matched?
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10. A child hears a loud bus horn and immediately moves aside. Which system helps the child respond quickly?
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11. Which of the following is one of the major excretory organs mentioned in the lesson?
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12. Which sequence correctly shows the movement of food through the digestive system?
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13. Why must all organ systems work together?
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14. Which example shows the nervous system helping us understand our surroundings?
PART-D2 : Fill in the Blanks
Fill in the blanks with the correct words.
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1. The human body has many __________.
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2. A group of organs working together to perform a common function is called an __________.
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3. There are __________ bones in an adult human body.
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4. The longest bone in the human body is the __________.
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5. The shortest bone in the human body is the __________.
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6. The process of changing complex food into simple and absorbable materials is called __________.
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7. The process of breathing in is called __________.
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8. The process of breathing out is called __________.
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9. The heart has __________ chambers.
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10. Blood vessels that carry blood from the heart to different parts of the body are called __________.
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11. Blood vessels that carry blood from the body back to the heart are called __________.
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12. The three major excretory organs mentioned in the lesson are the kidneys, lungs and __________.
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13. The kidneys filter the __________ and remove impurities from it.
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14. The brain, spinal cord and nerves together form the __________ system.
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15. The heart produces the sound __________.
PART-D3 : Concept & Thinking Questions
Answer the following questions.
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1. Riya eats her food very quickly without chewing it properly. What problem may this cause? What should she do?
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2. Arun runs for several minutes. His breathing becomes faster and his heart beats faster. Explain why both changes happen together.
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3. Imagine that the kidneys stop filtering the blood properly. Which function of the excretory system will be affected? Why?
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4. A child hears a bus horn and immediately moves aside. Describe the role of the nervous system in this situation.
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5. Why is the ribcage important even though it does not digest food or pump blood?
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6. Suppose the circulatory system did not transport nutrients from food to different parts of the body. What would be affected?
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7. The digestive system and respiratory system do different jobs. How do their functions help the body get energy?
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8. Why can we say that our body is like an amazing machine? Give two reasons.
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9. A person eats healthy food but does not exercise or take proper care of the body. Why is healthy food alone not enough to keep the body healthy?
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10. Compare the work of the heart and the kidneys. How are their functions different?
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11. A student says, “The lungs and kidneys do completely different work, so they do not have anything in common.” Do you agree? Explain.
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12. If the nervous system did not send messages between the brain and body parts, what kinds of problems might occur?
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13. Why does the body need both the digestive system and the circulatory system after we eat food?
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14. Explain how three different organ systems can work together when a child runs and plays.
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15. “No single organ system can do all the work of the body.” Explain this statement with an example.
D1 – Multiple Choice Answers
1. B) Brain
2. B) It carries food to the stomach
3. B) Respiratory system
4. D) Stomach
5. B) Respiratory and circulatory systems
6. B) Kidneys
7. C) Lungs – help in breathing
8. B) Stethoscope
9. C) Kidneys – digest food
10. A) Nervous system
11. A) Skin
12. A) Mouth → Oesophagus → Stomach → Small intestine
13. B) Each system performs a different function that helps the body work properly.
14. C) The brain helps us understand what we see and hear.
2. B) It carries food to the stomach
3. B) Respiratory system
4. D) Stomach
5. B) Respiratory and circulatory systems
6. B) Kidneys
7. C) Lungs – help in breathing
8. B) Stethoscope
9. C) Kidneys – digest food
10. A) Nervous system
11. A) Skin
12. A) Mouth → Oesophagus → Stomach → Small intestine
13. B) Each system performs a different function that helps the body work properly.
14. C) The brain helps us understand what we see and hear.
D2 – Fill in the Blanks Answers
1. organs
2. organ system
3. 206
4. femur
5. stapes
6. digestion
7. inhalation
8. exhalation
9. four
10. arteries
11. veins
12. skin
13. blood
14. nervous
15. lub-dub
2. organ system
3. 206
4. femur
5. stapes
6. digestion
7. inhalation
8. exhalation
9. four
10. arteries
11. veins
12. skin
13. blood
14. nervous
15. lub-dub
D3 – Concept & Thinking Answers
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1. Riya eats her food very quickly without chewing it properly. What problem may this cause? What should she do?Digestion starts in the mouth. Eating too quickly and not chewing food properly may make digestion difficult. Riya should chew her food slowly and properly.
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2. Arun runs for several minutes. His breathing becomes faster and his heart beats faster. Explain why both changes happen together.During running, the body needs more energy. The respiratory system supplies more oxygen, while the circulatory system helps transport oxygen and nutrients to different parts of the body.
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3. Imagine that the kidneys stop filtering the blood properly. Which function of the excretory system will be affected? Why?Removal of impurities from the blood will be affected because the kidneys filter the blood and remove impurities in the form of urine.
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4. A child hears a bus horn and immediately moves aside. Describe the role of the nervous system in this situation.The ears receive the sound and the nerves carry the message to the brain. The brain understands the message and sends instructions through the nerves to the body, helping the child move aside quickly.
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5. Why is the ribcage important even though it does not digest food or pump blood?The ribcage is important because it protects the heart and lungs, which are essential organs of the body.
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6. Suppose the circulatory system did not transport nutrients from food to different parts of the body. What would be affected?Different parts of the body would not receive the nutrients they need. Therefore, the proper functioning of the body would be affected.
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7. The digestive system and respiratory system do different jobs. How do their functions help the body get energy?The digestive system changes food into simple and absorbable materials. The respiratory system supplies oxygen, which helps release energy from the food.
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8. Why can we say that our body is like an amazing machine? Give two reasons.1. Our body has many organ systems that perform different important functions.
2. All these systems work together to keep us alive, healthy and active. -
9. A person eats healthy food but does not exercise or take proper care of the body. Why is healthy food alone not enough to keep the body healthy?Healthy food provides nutrients and energy, but regular physical activity and good habits are also important for keeping the body fit and healthy.
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10. Compare the work of the heart and the kidneys. How are their functions different?The heart pumps blood through the blood vessels to all parts of the body. The kidneys filter the blood and remove impurities from it in the form of urine.
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11. A student says, “The lungs and kidneys do completely different work, so they do not have anything in common.” Do you agree? Explain.I do not agree. Although the lungs and kidneys perform different functions, both help in removing waste materials from the body and are part of the excretory system.
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12. If the nervous system did not send messages between the brain and body parts, what kinds of problems might occur?The body would not respond properly to sensations and instructions. We would have difficulty understanding what we see and hear and controlling our body movements.
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13. Why does the body need both the digestive system and the circulatory system after we eat food?The digestive system digests food and makes nutrients absorbable. The circulatory system transports those nutrients through the blood to different parts of the body.
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14. Explain how three different organ systems can work together when a child runs and plays.The skeletal system and muscles help the child move. The respiratory system supplies oxygen, and the circulatory system transports oxygen and nutrients to the body parts.
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15. “No single organ system can do all the work of the body.” Explain this statement with an example.Each organ system has a special function. For example, the digestive system digests food, the respiratory system supplies oxygen and the circulatory system transports nutrients and oxygen. Therefore, the systems must work together.
