Samacheer Kalvi Class 4 Science Solutions Term 1 Chapter 1 My Body

I. Pick Out the Odd One:

Question 1. Pick out the odd one from the following:
1. Heart
2. Legs
3. Brain
4. Kidney
Answer: (2) Legs
In simple words: Legs are visible, external body parts, while the heart, brain, and kidneys are hidden inside our body. The human body has many important parts that work together.

🎯 Exam Tip: When asked to find the odd one out, first identify the common category for most items, then find the one that doesn't fit.

Question 2. Pick out the odd one from the following:
1. Eyes
2. Ears
3. Fingers
4. Lungs
Answer: (4) Lungs
In simple words: Lungs are inside our body, helping us breathe. Eyes, ears, and fingers are external parts that we can see and touch. Each part of the body has a special job.

🎯 Exam Tip: Clearly state the reason why an item is odd, by categorizing the other items correctly.

Question 3. Pick out the odd one from the following:
1. Fore brain
2. Mid brain
3. Hind brain
4. Nerves
Answer: (4) Nerves
In simple words: The forebrain, midbrain, and hindbrain are all parts of the brain. Nerves are different, they are like wires that send messages all over the body. All these parts help the body function well.

🎯 Exam Tip: Remember the main parts of major organs like the brain to easily identify related terms.

II. Complete the Figure with Words Given in the Bracket:

Question 1. Classify the following actions as 'Good Touch' or 'Bad Touch':
(Kissing on the mouth, Grand parents' love, Hitting the buttocks, Pat of dad on head, Parent's hug and kisses, Showing awkward pictures)
Answer:
Good Touch:
- Grand parents' love
- Pat of dad on head
- Parent's hug and kisses

Bad Touch:
- Kissing on the mouth (if it makes you uncomfortable)
- Hitting the buttocks
- Showing awkward pictures
In simple words: Good touch makes you feel safe and loved, like a hug from your parents. Bad touch makes you feel uncomfortable, scared, or sad, and you should tell an adult about it. It's important to know the difference.

🎯 Exam Tip: Focus on how a touch makes you feel. If it feels wrong, scary, or uncomfortable, it's bad touch. If it feels caring and safe, it's good touch.

III. Find the Answers From the Following Clues and Circle the Words (First One Is Done for You):

Question 1. Find the answers from the following clues and highlight the words in the table below:
1. An internal organ.
2. Organ that helps us to breath.
3. An organ removing wastes from our body,
4. Unfair and unhealthy touch.
5. Everyday we should drink more _______ .
Answer:
The hidden words are:
1. Heart
2. Lungs
3. Kidney
4. Bad Touch
5. Water

🎯 Exam Tip: For word searches, scan horizontally, vertically, and diagonally in both forward and backward directions to find all the hidden words.

IV. Say True or False:

Question 1. Head, hand and legs are internal organs.
Answer: False
In simple words: Head, hands, and legs are external parts of our body that we can see and touch. Internal organs like the heart or lungs are hidden inside. It's important to differentiate between visible and hidden body parts.

🎯 Exam Tip: Understand the definition of internal (inside the body) and external (outside the body) organs to correctly answer these types of questions.

Question 2. Heart is made up of muscles.
Answer: True
In simple words: Our heart is a strong muscle that works all the time to pump blood throughout our body. This muscular action helps circulate blood and oxygen to all cells.

🎯 Exam Tip: Remember that the heart is a vital organ made of special muscle tissue, allowing it to continuously pump blood.

Question 3. Muscles are the soft parts that cover our bones.
Answer: True
In simple words: Yes, muscles are soft tissues that surround and protect our bones, allowing us to move. They help us perform all kinds of actions, from walking to lifting.

🎯 Exam Tip: Understand the basic structure of the body: bones provide support, and muscles attach to them to enable movement.

Question 4. Brush your teeth once a day.
Answer: False
In simple words: We should brush our teeth at least two times a day – once in the morning and once before going to bed – to keep them clean and healthy. Regular brushing helps remove food particles and prevent cavities.

🎯 Exam Tip: Daily hygiene practices like brushing teeth twice a day are crucial for good health and are common general knowledge questions.

Question 5. Father patting you on your head is a good touch.
Answer: True
In simple words: A loving pat on the head from a parent is a sign of care and affection, making it a good touch. It makes us feel safe and cared for.

🎯 Exam Tip: Good touch makes you feel loved, safe, and comfortable, while bad touch makes you feel scared or unhappy.

V. Choose the Correct Answer:

Question 1. _______ is the commanding centre of our body.
(a) Heart
(b) Lungs
(c) Kidney
(d) Brain
Answer: (d) Brain
In simple words: The brain is like the main computer of our body, telling all other parts what to do and helping us think. It controls everything we do, feel, and learn.

🎯 Exam Tip: Remember that the brain is responsible for all control and coordination in the body, making it the "commanding centre."

Question 2. Food is converted to energy in the _______.
(a) Neck
(b) Heart
(c) Stomach
(d) Nose
Answer: (c) Stomach
In simple words: The stomach is where food starts to break down into smaller pieces so the body can use it for energy. It uses special juices to help with this process.

🎯 Exam Tip: Recall the basic path of digestion: food goes from the mouth to the stomach, where initial breakdown occurs.

Question 3. Every day we should brush our teeth _______ times.
(a) One
(b) Two
(c) Three
(d) Four
Answer: (b) Two
In simple words: Brushing our teeth twice a day, in the morning and before bed, helps keep them clean and free from germs. This helps prevent tooth decay and gum problems.

🎯 Exam Tip: Good dental hygiene is important, and brushing twice daily is a key recommendation for maintaining healthy teeth.

Question 4. Good touch is a fair and _______ touch.
(a) Unhealthy
(b) Bad
(c) Unsafe
(d) Healthy
Answer: (d) Healthy
In simple words: Good touch is always fair and makes you feel safe and healthy, not bad or unsafe. It promotes feelings of well-being and security.

🎯 Exam Tip: Associate good touch with positive feelings like care, safety, and health, and bad touch with negative feelings.

Question 5. What should we drink a lot of every day?
(a) Packed juice
(b) Water
(c) Salt water
(d) None of the options
Answer: (b) Water
In simple words: Drinking plenty of water every day is very important for our body to stay hydrated and work properly. Water helps our body in many ways, including carrying nutrients and regulating temperature.

🎯 Exam Tip: Staying hydrated by drinking enough water is a fundamental aspect of good health, essential for all body functions.

VI. Answer the Following Questions in One or Two Sentences:

Question 1. Name the internal organs.
Answer: Some body parts inside us, like the stomach, lungs, heart, brain, and kidneys, are called internal organs. These organs perform important tasks to keep us alive and healthy. They are all essential for the body's proper functioning.
In simple words: Internal organs are parts inside our body, like the stomach, lungs, heart, and brain.

🎯 Exam Tip: Be able to list at least three to four major internal organs and briefly describe their general location or function.

Question 2. What are the functions of the brain?
Answer: The brain is the commanding centre of our body. It controls all activities like moving our hands and legs, sitting, or walking, and it also helps us think and perform various actions. The brain processes information and allows us to understand the world around us.
In simple words: The brain controls all body movements, helps us think, and lets us do many things.

🎯 Exam Tip: Emphasize the brain's role as the central control unit for both physical actions and mental processes like thinking.

Question 3. List out the food items for healthy mouth and teeth.
Answer: To keep our mouth and teeth healthy, we should drink water or milk instead of sugary juices. We should also eat plenty of fruits, vegetables, and dairy products. Eating candy, cake, and ice cream should be kept to a minimum to avoid damage to teeth. Balanced nutrition is key for strong teeth and gums.
In simple words: For healthy teeth, drink water, milk, eat fruits, vegetables, and dairy. Avoid too much candy and sugary treats.

🎯 Exam Tip: Focus on nutrient-rich foods that strengthen teeth and limit sugary items that can cause cavities.

Question 4. How will you take care of your heart and kidney?
Answer: To care for a healthy heart, we should stay away from processed foods and choose fresh fruits and vegetables instead. For healthy kidneys, it is important to drink plenty of fluids like water and juice. A healthy lifestyle with balanced nutrition supports both these vital organs. Regular exercise also plays a crucial role in maintaining cardiovascular health.
In simple words: Eat fresh food for a healthy heart and drink lots of water for healthy kidneys.

🎯 Exam Tip: Link specific healthy habits (eating fresh food, drinking water) to the care of particular organs (heart, kidneys).

Question 5. What do you do when someone touches you and you feel uncomfortable?
Answer: If someone touches me and I feel uncomfortable, I should immediately say "Don't touch" in a loud voice and quickly leave that spot. It is very important to then tell elders like my parents or teachers until I get help. Speaking up is crucial for safety.
In simple words: If an uncomfortable touch happens, say "Don't touch" loudly, move away quickly, and tell a trusted adult like a parent or teacher.

🎯 Exam Tip: The key steps for an uncomfortable touch are clear communication, removing yourself from the situation, and immediately seeking help from a trusted adult.

VII. Think and Answer:

Question 1. When an unknown person disturbs you, how do you behave? Write in your own words.
Answer: If an unknown person disturbs me, I must never be afraid. I should shout and say, "Don't touch me!" very clearly. I must then leave that spot quickly and go to a safe place. After that, I would tell my parents or teacher right away to get help. It is always important to trust my feelings and seek help. I would also try to remember details about the person, like what they were wearing.
In simple words: If a stranger disturbs me, I should shout "Don't touch me!", run away fast, and tell my parents or teacher at once.

🎯 Exam Tip: When writing about safety, include actions that show self-protection, seeking help, and clear communication.

Question 2. Which organ controls thinking, speaking, and learning? Write its three important parts.
Answer: The organ that controls thinking, speaking, and learning is the 'Brain'. The three important parts of the Brain are: Forebrain, Midbrain, and Hindbrain. Each part plays a specific role in our body's functions. The brain is truly an amazing and complex organ.
In simple words: The brain controls how we think, talk, and learn. Its three main parts are the forebrain, midbrain, and hindbrain.

🎯 Exam Tip: Clearly identify the organ and then list its main divisions, ensuring correct spelling and terminology.

Samacheer Kalvi 4th Science Guide My Body InText Questions and Answers

Let Us Recall (Text Book Page No. 82)

Question 1. There are some body parts hidden in the table below. Can you spot them?
Answer:
The body parts hidden in the table are:
1. Heart
2. Nose
3. Ears
4. Leg
5. Hand

🎯 Exam Tip: Systematically check rows, columns, and diagonals for words, and cross-reference with the list of possible body parts.

Try to Answer (Text Book Page No. 83)

Question 1. _______ (Nose / Brain) is an internal organ.
Answer: Brain
In simple words: The brain is an internal organ because it is located inside our skull. The nose, however, is an external part of our face.

🎯 Exam Tip: Differentiate internal from external organs. Internal organs are housed within body cavities, while external organs are visible on the surface.

Question 2. [Question text missing in source]
Answer: False
In simple words: (Based on the common knowledge context of the chapter, if the missing question was about something incorrect related to the body, then the answer is 'False'. However, since the question is missing, a direct explanation isn't possible). This shows that sometimes information needs to be inferred or is incomplete.

🎯 Exam Tip: In exams, if a question is incomplete, ask for clarification. If not possible, make a reasonable assumption based on the provided answer or context.

Try to Answer (Text Book Page No. 86)

Match the Following:

Question 1. Match the following:
1. Pair of spongy sac
2. 'J' shaped bag
3. Filters excess water
4. Command centre
5. Pumps blood
Answer:
1. Pair of spongy sac - Lungs
2. 'J' shaped bag - Stomach
3. Filters excess water - Kidney
4. Command centre - Brain
5. Pumps blood - Heart
In simple words: We match each body part's description to the correct organ. Lungs are spongy, the stomach is J-shaped, kidneys clean water, the brain controls everything, and the heart pumps blood. Each organ has a special job.

🎯 Exam Tip: Learn the key characteristics and functions of each major organ to easily make correct matches.

Try to Answer (Text Book Page No. 89)

Question 1. Tick (✔) the foods that are good for your teeth and cross (X) the food that are bad for your teeth.
Answer:
- Broccoli (✔)
- Candy (X)
- Cabbage (✔)
- Lollipop (X)
- Cupcake (X)
- Carrot (✔)
- Milk (✔)
- Meat (✔)
- Egg (✔)
- Almonds (✔)
- Ice cream (X)
In simple words: Foods rich in vitamins and minerals like broccoli, carrots, milk, and eggs are good for strong teeth. Sugary foods like candy, cupcakes, and ice cream can cause tooth decay, so they are bad. Eating healthy helps keep our teeth strong.

🎯 Exam Tip: Remember to choose fresh, natural foods for dental health and limit processed or sugary treats.

Try to Answer (Text Book Page No. 90)

Question 1. Is it Good touch or Bad touch? Why?
Answer:
(A) A gentle touch on a child's head from a caring adult is a good touch. It is the kind of touch that shows care and offers help to each other.
(B) An adult hugging a child with warmth and care is a good touch. These touches make children feel safe, loved, and happy. When a touch feels loving and safe, it is considered good.
In simple words: Good touch makes you feel loved and safe, like a gentle pat or a warm hug. It shows care and is not meant to harm or scare you.

🎯 Exam Tip: Explain that good touch involves respect and positive feelings, making the person feel comfortable and secure.

Try to Answer (Text Book Page No. 92)

Question 1. Look at the picture and write 'Good touch' or 'Bad touch'.
Answer:
- Image 1: Adult shaking hands with child, smiling - Good Touch
- Image 2: Adult hitting child's buttocks - Bad Touch
- Image 3: Adult holding child's hand protectively - Good Touch
- Image 4: Adult pulling child aggressively - Bad Touch
- Image 5: Adult comforting a crying child - Good Touch
- Image 6: Adult giving something to child with a smile - Good Touch
- Image 7: Adult holding child in an uncomfortable way - Bad Touch
- Image 8: Adult patting child on the back - Good Touch
- Image 9: Adult slapping child's face - Bad Touch
In simple words: Pictures that show people being kind, safe, and respectful are good touch. Pictures that show people being hurtful, angry, or making you uncomfortable are bad touch. It's important to recognize the difference to stay safe.

🎯 Exam Tip: Focus on the emotions conveyed by the interaction and whether the touch appears respectful and comfortable or disrespectful and harmful.

Samacheer Kalvi 4th Science Guide My Body Additional Questions and Answers

Question 1. The parts of the brain include forebrain, midbrain, and hindbrain. The commanding part is called the _______.
Answer: Center brain
In simple words: The brain is divided into main parts: the forebrain, midbrain, and hindbrain, with the 'center brain' being a general term for the core control area. These parts work together to manage all brain functions.

🎯 Exam Tip: Know the main divisions of the brain and their primary roles in controlling the body.

Question 2. The stomach is a _______ organ. While the lungs can contract and expand.
Answer: J-shaped
In simple words: The stomach looks like the letter 'J' and helps digest our food. Lungs, on the other hand, are spongy and change size when we breathe. Each organ has a unique shape and function.

🎯 Exam Tip: Remember the distinctive shapes of organs like the stomach (J-shaped) as it can be an easy way to identify them.

Question 3. The kidneys are _______ shaped organs that purify blood through filtering.
Answer: Bean shaped
In simple words: Our kidneys are shaped like beans and work hard to clean our blood, removing waste materials. This filtering process is essential for keeping our body healthy.

🎯 Exam Tip: Associate the kidney's function of filtering blood with its characteristic bean shape.

Write True or False:

Question 1. Brain is protected by skull.
Answer: True
In simple words: Yes, our brain is safely kept inside our skull, which is a strong bone structure that protects it from harm. The skull acts like a helmet for the brain.

🎯 Exam Tip: Understand that the skull is a primary protective structure for the delicate brain, highlighting the body's natural defenses.

Question 2. We have three kidneys.
Answer: False
In simple words: Humans normally have two kidneys, not three. These two kidneys are very important for cleaning our blood and making urine. Having just two kidneys is enough for most people to live a healthy life.

🎯 Exam Tip: Remember the common number of major organs; most humans have two kidneys.

Question 3. Lungs help us to breath.
Answer: True
In simple words: Yes, our lungs are the main organs that help us breathe in fresh air and breathe out old air. They take in oxygen and release carbon dioxide.

🎯 Exam Tip: The lungs are essential for respiration, the process of taking in oxygen and expelling carbon dioxide.

Question 4. When we breath in, the lungs become bigger.
Answer: True
In simple words: When we breathe in, our lungs fill with air and get bigger, like balloons inflating. This expansion allows our body to take in oxygen.

🎯 Exam Tip: Visualize the process of breathing: lungs expand when air enters and contract when air leaves.

Question 5. We breath out, we give out oxygen from the lungs.
Answer: False
In simple words: When we breathe out, we release carbon dioxide, which is a waste gas, from our lungs. We breathe in oxygen, which our body needs. The process of breathing out removes what the body doesn't need.

🎯 Exam Tip: Remember the gases exchanged during breathing: we inhale oxygen and exhale carbon dioxide.

Question 6. Lungs pumps blood to all parts of the body.
Answer: False
In simple words: The heart is the organ that pumps blood to all parts of the body, not the lungs. The lungs are responsible for exchanging gases (oxygen and carbon dioxide) in the blood. The heart and lungs work together, but have different main jobs.

🎯 Exam Tip: Clearly distinguish the primary functions of the heart (pumping blood) and lungs (gas exchange).

Match the Following:

Question 1. Match the following:
Touching private parts - (b) Bad touch
Shaking hands - (a) Good touch
Neem - (d) Healthy teeth
Incisors - (c) Permanent teeth
Answer:
1. Touching private parts - (b) Bad touch
2. Shaking hands - (a) Good touch
3. Neem - (d) Healthy teeth
4. Incisors - (c) Permanent teeth
In simple words: This matching exercise helps us connect different ideas: touching private parts is a bad touch, shaking hands is a good touch, neem helps keep teeth healthy, and incisors are a type of permanent teeth. It covers various aspects of health and safety.

🎯 Exam Tip: Understand the connections between body parts, health practices, and safety concepts to correctly match items.

Fill the Blanks:

Question 1. When we breath out, we give out _______ from the lungs.
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) Hydrogen
Answer: (a) Carbon dioxide
In simple words: When we breathe out, our lungs release carbon dioxide, a waste gas produced by our body. We breathe in oxygen, which is essential for life.

🎯 Exam Tip: Distinguish between the gas inhaled (oxygen) and the gas exhaled (carbon dioxide) during respiration.

Question 2. The heart beat about _______ in a minute.
(a) 71 times
(b) 72 times
(c) 62 times
(d) 60 times
Answer: (b) 72 times
In simple words: A healthy adult's heart usually beats around 72 times every minute. This steady beat pumps blood throughout our body, keeping us alive. This rate can vary slightly from person to person.

🎯 Exam Tip: Remember the average resting heart rate for adults (around 72 beats per minute) as a common biological fact.

Question 3. How many kidneys does the human body have?
(a) 2
(b) 1
(c) 3
(d) 4
Answer: (a) 2
In simple words: Most human bodies have two kidneys, which work together to clean our blood. These two kidneys are enough to perform all the necessary filtering tasks.

🎯 Exam Tip: Recall that the human body typically has a pair of kidneys, not just one or more than two.

Question 4. How many bones are there in an adult human being?
(a) 210
(b) 260
(c) 206
(d) 201
Answer: (c) 206
In simple words: An adult human body has 206 bones, which give it shape, support, and protection. Babies are born with more bones that later join together.

🎯 Exam Tip: Know the specific number of bones in an adult human body as it's a fundamental fact in biology.

Question 5. The main function of the kidney is _______.
(a) To control body temperature
(b) To remove waste product from the body
(c) To help in digestion of food
(d) To help in digestion of food.
Answer: (c) To remove waste product from the body
In simple words: The main job of the kidneys is to filter waste products and extra water from our blood, which then leaves our body as urine. This helps keep our blood clean and balanced.

🎯 Exam Tip: Focus on the kidneys' role in filtration and waste removal, which is crucial for maintaining internal balance.

Question 6. How many bones are there in a newly born infant?
(a) 206
(b) 230
(c) 280
(d) 300
Answer: (d) 300
In simple words: A new baby has about 300 bones, which is more than an adult. As the baby grows, some of these bones fuse together, reducing the total count to 206 in adulthood. This shows how our bodies change as we grow.

🎯 Exam Tip: Remember that infants have more bones than adults, as some bones combine during growth. This is a common comparative fact.

Question 7. Which is the largest organ in the human body?
(a) Liver
(b) Heart
(c) Skin
(d) Kidney
Answer: (c) Skin
In simple words: The skin is the largest organ of our body because it covers our entire outer surface. It protects us from germs and helps control our body temperature. It acts as a protective barrier.

🎯 Exam Tip: Understand that "largest organ" refers to overall surface area and weight, making skin the correct answer, not internal organs.

V. Fill in the Blanks:

Question 1. Stomach is a _______ bag found below the lungs.
Answer: J-shaped
In simple words: The stomach is a J-shaped organ located below the lungs, where food is broken down. Its unique shape helps it churn and mix food efficiently.

🎯 Exam Tip: Knowing the distinctive shapes of organs, like the J-shape of the stomach, helps in identifying them correctly.

Question 2. Heart is made up of _______.
Answer: Muscles
In simple words: Our heart is a strong muscular organ that continuously pumps blood throughout the body. Its strong muscles allow it to beat non-stop.

🎯 Exam Tip: Recall that the heart is composed of specialized muscle tissue, enabling its crucial pumping action.

Question 3. Stomach contains special juice to breakdown _______ into energy.
Answer: Food
In simple words: The stomach uses special digestive juices to break down the food we eat, turning it into energy for our body. This process is called digestion.

🎯 Exam Tip: Understand the role of the stomach in digestion, specifically its use of enzymes (juices) to break down food.

Question 4. The kidneys purify _______.
Answer: Blood
In simple words: The kidneys are vital organs that filter and purify our blood, removing waste products. This continuous cleaning process keeps our blood healthy.

🎯 Exam Tip: Remember that the primary function of the kidneys is to filter and cleanse the blood, maintaining body fluid balance.

VI. Answer the Following Questions in One or Two Sentences:

Question 1. Draw a human heart and colour the picture.
Answer: (This question requires a drawing, which cannot be directly rendered in HTML. A representation of the human heart is shown in the source, typically depicting its chambers and major blood vessels.)
In simple words: Draw a picture of the human heart, showing its general shape and color. It's important to understand the basic structure of this vital organ.

🎯 Exam Tip: Practice drawing the heart with its basic outline and chambers to understand its structure. Use appropriate colors (red for oxygenated blood, blue for deoxygenated blood) if specifying blood flow.

Question 2. When we breathe in, what happens to our lungs? How do they help us breathe?
Answer: When we breathe in, we take in oxygen from the air through our nose and pass it to our lungs. As a result, our lungs expand and become bigger to hold the air. This process brings fresh oxygen into our body. The lungs are crucial for life, as they facilitate the exchange of gases.
In simple words: When we breathe in, oxygen goes into our lungs, and they get bigger. This helps us take in the air we need to live.

🎯 Exam Tip: Explain that breathing involves the lungs taking in oxygen, which makes them expand, and then releasing carbon dioxide.

Question 3. What are milk teeth?
Answer: Milk teeth are the first set of teeth that a baby develops, usually starting from around six months of age. There are typically 20 milk teeth in total. These temporary teeth eventually fall out to make way for permanent teeth. They are important for a child's early chewing and speech development.
In simple words: Milk teeth are a baby's first set of 20 teeth that grow when they are young and later fall out.

🎯 Exam Tip: Remember that milk teeth are temporary, are fewer in number than permanent teeth, and precede the adult set.

Question 4. Name the four types of permanent teeth.
Answer: The four types of permanent teeth are Incisors, Canines, Premolars, and Molars. Each type of tooth has a special shape and job for chewing and biting food. These teeth are designed to last a lifetime with proper care. These different shapes help us eat various kinds of food effectively.
In simple words: The four types of permanent teeth are incisors, canines, premolars, and molars.

🎯 Exam Tip: Learn the names and functions of each type of permanent tooth to understand their role in digestion.

Question 5. How do you take care of your mouth and teeth?
Answer: To take care of our mouth and teeth, we should change our toothbrush once every three months and avoid sticky foods. It's important to brush our teeth twice a day (after waking up and before going to bed) and rinse our mouth with water every time after we eat. These practices help prevent cavities and gum disease. Regular dental check-ups are also important.
In simple words: To care for your mouth and teeth, brush twice a day, rinse after eating, change your toothbrush often, and avoid sticky foods.

🎯 Exam Tip: List a variety of hygiene practices (brushing, rinsing, replacing brush) and dietary advice (avoiding sticky foods) for comprehensive dental care.

Question 6. List out the activities related to bad touch.
Answer: Activities related to bad touch include touching buttocks and other private parts, hitting or punching, and kissing if it makes you uncomfortable. Also, any actions that make you feel scared, nervous, or ashamed, as well as showing dirty talk or dirty pictures, are considered bad touch. It's crucial to identify these situations and seek help. Bad touch is any touch that makes you feel unsafe or uncomfortable.
In simple words: Bad touch involves touching private parts, hitting, punching, or anything that makes you feel scared, nervous, or ashamed.

🎯 Exam Tip: Focus on the feeling (uncomfortable, scared, ashamed) as the key indicator of bad touch, and list examples that invade personal boundaries.

Question 1. Brain is protected by skull.
Answer: True. The brain is very delicate and is protected by a hard, bony case called the skull. This skull acts like a natural helmet, keeping the brain safe from harm.
In simple words: The skull acts like a helmet for your brain, keeping it protected.

🎯 Exam Tip: Remember that different parts of the body have specific protections, like the rib cage for the heart and lungs, and the skull for the brain.

Question 2. We have three kidneys.
Answer: False. Humans typically have two kidneys, not three. These two bean-shaped organs are vital for filtering waste from the blood.
In simple words: Most people have two kidneys.

🎯 Exam Tip: Knowing the correct number of organs like kidneys helps in understanding basic human anatomy.

Question 3. Lungs help us to breath.
Answer: True. Lungs are the main organs responsible for breathing. They take in oxygen from the air and release carbon dioxide, which is essential for life.
In simple words: Lungs help us breathe in and out.

🎯 Exam Tip: When answering true/false questions, think about the primary function of the organ mentioned.

Question 4. When we breath in, the lungs become bigger.
Answer: True. When we breathe in, our diaphragm muscle moves down and our chest muscles pull up, making our chest cavity bigger. This allows air to rush into the lungs, making them expand and become bigger.
In simple words: When you breathe in, your lungs get bigger with air.

🎯 Exam Tip: Visualize the process of breathing to easily understand how the lungs change size.

Question 5. We breath out, we give out oxygen from the lungs.
Answer: False. When we breathe out, our body releases carbon dioxide, not oxygen. Carbon dioxide is a waste gas that our body produces and needs to get rid of.
In simple words: When we breathe out, we let out carbon dioxide, not oxygen.

🎯 Exam Tip: Remember that we inhale oxygen and exhale carbon dioxide during respiration.

Match the following :

Question 1.
Answer:
1. Touching private parts - (b) Bad touch
2. Shaking hands - (a) Good touch
3. Neem - (d) Healthy teeth
4. Incisors - (c) Permanent teeth
In simple words: We match different actions or items with their correct categories, like what kind of touch it is or what it helps with.

🎯 Exam Tip: For matching questions, read all options carefully before pairing to avoid mistakes, and make sure the pairing makes logical sense.

Fill the blanks :

Question 1. When we breath out, we give out ______ from the lungs.
(a) Carbon dioxide
(b) Oxygen
(c) Nitrogen
(d) Hydrogen
Answer: (a) Carbon dioxide
In simple words: We breathe out carbon dioxide from our lungs.

🎯 Exam Tip: Remember the primary gas exchanged during exhalation is carbon dioxide.

Question 2. The heart beat about ______ in a minute.
(a) 71 times
(b) 72 times
(c) 62 times
(d) 60 times
Answer: (b) 72 times
In simple words: Your heart usually beats 72 times in a minute.

🎯 Exam Tip: The average resting heart rate for adults is typically between 60 and 100 beats per minute, with 72 being a common average.

Question 3. How many kidneys does the human body have?
(a) 2
(b) 1
(c) 3
(d) 4
Answer: (a) 2
In simple words: Humans normally have two kidneys.

🎯 Exam Tip: While people can live with one kidney, two is the typical number in a healthy human body.

Question 4. How many bones are there in an adult human being?
(a) 210
(b) 260
(c) 206
(d) 201
Answer: (c) 206
In simple words: An adult person has 206 bones.

🎯 Exam Tip: Remember that babies have more bones than adults, as some bones fuse together during growth.

Question 5. The main function of the kidney is
(b) To control body temperature
(c) To remove waste product from the body
(d) To help in digestion of food.
Answer: (c) To remove waste product from the body
In simple words: Kidneys mainly clean the blood and remove waste.

🎯 Exam Tip: The primary role of kidneys is filtration and waste excretion, not temperature control or digestion.

Question 6. How many bone are there is a newly born infant
(a) 206
(b) 230
(c) 280
(d) 300
Answer: (d) 300
In simple words: A new baby has about 300 bones.

🎯 Exam Tip: Newborns have more bones than adults because some bones are separate at birth and later fuse together.

Question 7. Which is the largest organ in the human body?
(a) Liver
(b) Heart
(c) Skin
(d) Kidney
Answer: (c) Skin
In simple words: Skin is the biggest organ covering our whole body.

🎯 Exam Tip: Consider the total surface area when thinking about the largest organ; the skin covers the entire external body.

V. Fill in the blanks.

Question 1. Stomach is a ______ bag found below the lungs.
Answer: J-shaped. The stomach is an organ that looks like the letter 'J'. It is located below the lungs and plays a key role in the digestion of food.
In simple words: The stomach is a J-shaped bag below your lungs.

🎯 Exam Tip: Knowing the shape of organs can help you remember their location and function within the body.

Question 2. Heart is made up of _______.
Answer: Muscles. The heart is a very strong muscular organ located in our chest. Its continuous pumping action circulates blood throughout the entire body.
In simple words: Your heart is made of muscles that pump blood.

🎯 Exam Tip: The heart's muscular composition allows it to contract and relax powerfully to pump blood.

Question 3. Stomach contains special juice to breakdown ______ into energy.
Answer: Food. The stomach has special acidic juices and enzymes that work together to break down the food we eat. This process is crucial for converting food into usable energy for our body's functions.
In simple words: Special juices in the stomach break down food for energy.

🎯 Exam Tip: Remember that digestion starts in the mouth, but the stomach plays a major role in breaking down food further.

Question 4. The kidneys purify ______.
Answer: Blood. The kidneys act as the body's natural filters, removing waste products, toxins, and excess water from the blood. This filtered waste is then excreted as urine, maintaining overall body health.
In simple words: Kidneys clean the blood.

🎯 Exam Tip: Always associate kidneys with filtering blood and producing urine to maintain internal balance.

VI. Answer the following questions in one or two sentences :

Question 1. Draw a human heart and colour the picture.
Answer: Students should draw an accurate picture of a human heart. After drawing, they should use appropriate colours to represent the different parts or chambers of the heart. This task helps in understanding the organ's structure and appearance.
In simple words: Draw and color a picture of a human heart.

🎯 Exam Tip: When drawing diagrams, pay attention to proportions and clearly label important parts to score full marks.

Question 2. How do we breathe in?
Answer: When we breathe in, air carrying oxygen enters our nose and travels down to our lungs. Our lungs then expand and become bigger to take in this air. This process brings oxygen into our body for all its functions.
In simple words: We breathe in through our nose, and the air with oxygen goes to our lungs, making them bigger.

🎯 Exam Tip: Understand the pathway of air from the nose to the lungs and the role of expansion in inhalation.

Question 3. What is milk teeth?
Answer: Milk teeth are the first set of teeth that begin to grow in babies, usually from the age of six months. There are typically 20 milk teeth in total. These temporary teeth eventually fall out to be replaced by permanent teeth.
In simple words: Milk teeth are a baby's first 20 teeth that grow around six months old.

🎯 Exam Tip: Remember that milk teeth are temporary and are replaced by a permanent set, distinguishing them from adult teeth.

Question 4. Name the four types of the permanent teeth.
Answer: The four types of permanent teeth are Incisors, Canines, Premolars, and Molars. Each type has a specific job in biting, tearing, or grinding food, helping in the digestion process.
In simple words: The four types of permanent teeth are Incisors, Canines, Premolars, and Molars.

🎯 Exam Tip: Knowing the function of each type of tooth helps you remember their names and importance in chewing food.

Question 5. How do you take care of your mouth and teeth?
Answer: To take good care of your mouth and teeth, you should change your toothbrush every three months. It's important to avoid sticky foods and brush your teeth twice daily, once in the morning and once before bed. Always rinse your mouth with water after eating to remove food particles.
In simple words: To care for teeth, change your brush often, avoid sticky sweets, brush twice a day, and rinse after meals.

🎯 Exam Tip: Good oral hygiene prevents cavities and gum problems, so these steps are crucial for long-term dental health.

Question 6. List out the activities related to bad touch.
Answer: Activities related to bad touch include someone touching your buttocks or other private body parts. Any actions or words that make you feel scared, nervous, or ashamed, such as dirty talk or showing inappropriate pictures, are also considered bad touch. It is vital to recognize these situations and seek help.
In simple words: Bad touch means someone touches private parts, or does things that make you feel scared or ashamed, like showing dirty pictures.

🎯 Exam Tip: Understanding and identifying bad touch is crucial for personal safety; always report such incidents to a trusted adult.