Samacheer Kalvi Class 4 Science Solutions Term 1 Chapter 4 Science in Everyday life

I. Choose the correct answer :

Question 1. Primary source of energy for the young ones of some animals is
(a) Water
(b) Fruits
(c) Milk
Answer: (c) Milk
In simple words: Baby animals get their first and most important food from milk. It helps them grow strong and healthy.

🎯 Exam Tip: When identifying primary sources, think about the earliest and most direct food intake for newborns.

Question 2. Vitamin present in milk that helps us to maintain our bones is
(a) Vitamin-E
(b) Vitamin-C
(c) Vitamin-D
Answer: (c) Vitamin-D
In simple words: Milk has Vitamin-D, which is very important for making our bones strong and keeping them healthy. This vitamin also helps our bodies use calcium better.

🎯 Exam Tip: Remember that Vitamin-D works with calcium to build strong bones, so always connect them in your mind.

Question 3. One of the ancient food items made by human is
(a) Noodles
(b) Cake
(c) Bread
Answer: (c) Bread
In simple words: Bread is a very old food that people have made for a long time. It was one of the first processed foods humans created.

🎯 Exam Tip: When thinking about ancient foods, consider items that require simple processing and common ingredients available historically.

Question 4. ___________ is a raw food.
(a) Cucumber
(b) Chappatti
(c) Bread
Answer: (a) Cucumber
In simple words: A cucumber is a raw food because we can eat it fresh without cooking it first. Many fruits and some vegetables are good examples of raw foods.

🎯 Exam Tip: Raw foods are those that can be consumed directly without any heat treatment or complex preparation.

Question 5. A gadget that plays songs is called
(a) Pen drive
(b) Camera
(c) Music player
Answer: (c) Music player
In simple words: A music player is a device made just for listening to songs. It lets us enjoy our favorite music wherever we go.

🎯 Exam Tip: Distinguish between devices that store data (like a pen drive) and those primarily designed for a specific function (like playing music or taking photos).

II. Fill in the blanks :

Question 1. Cheese and paneer are made from __________.
Answer: Milk
In simple words: Cheese and paneer are both dairy products created from milk. The milk is curdled and pressed to make these foods.

🎯 Exam Tip: Many common dairy products, like butter and yogurt, also have milk as their main ingredient.

Question 2. Nutrients are made ready for digestion by __________.
Answer: Cooking
In simple words: Cooking helps break down food, making it easier for our bodies to digest and get the nutrients. It also makes food taste better and safer to eat.

🎯 Exam Tip: Cooking food not only prepares nutrients for digestion but also helps kill harmful germs, making it safer to consume.

III. Match the following :

Question 1.

🎯 Exam Tip: For matching questions, carefully read both columns and identify the primary function of each item to ensure correct pairing.

IV. Answer in a sentence or two :

Question 1. Name the food products derived from milk.
Answer: Many food products come from milk, like curd, butter, buttermilk, ghee, cheese, paneer, milk sweets, ice cream, and chocolates. Milk is a versatile ingredient used in various delicious items.
In simple words: Milk is used to make things like curd, butter, cheese, and ice cream.

🎯 Exam Tip: When asked to list products, try to recall items from different categories (e.g., fermented, solid, liquid) to provide a comprehensive answer.

Question 2. Write the names of any three baked foods.
Answer: Three common baked foods are bread, biscuits, and cakes. Baking uses dry heat, typically in an oven, to cook these items.
In simple words: Bread, biscuits, and cakes are all foods that are made by baking.

🎯 Exam Tip: Baked foods are typically cooked using dry heat, often in an oven, which gives them a distinct texture and flavor.

Question 3. In what ways a smart phone will help you?
Answer: A smartphone helps us communicate with others, access the internet for information, store files like documents and photos, take pictures, and track locations using GPS. It's a very useful multi-purpose device.
In simple words: A smartphone helps us talk to people, go online, save files, take pictures, and find places.

🎯 Exam Tip: When describing smartphone uses, think about communication, information access, media, and practical tools like GPS.

Question 4. What is food?
Answer: Food is a basic need for life that gives us energy and essential nutrients to stay healthy. It is usually made from plants and animals, prepared through cooking. Eating food helps our bodies grow and function well.
In simple words: Food is what we eat to get energy and important nutrients. It helps our bodies grow and stay healthy.

🎯 Exam Tip: Remember to include both the energy-giving and nutrient-providing aspects when defining food.

V. Answer in detail :

Question 1. Cooking removes harmful microbes. Write down other benefits of cooking.
Answer: Cooking brings many good changes to food. It helps make nutrients easier to digest, creates the right texture, flavor, and taste we enjoy, and destroys harmful microbes, making food safe to eat. This process improves both the safety and appeal of food.

• Cooking makes many good changes in food.
• It makes nutrients ready for digestion.
• It helps to make food in the desired texture, flavor and taste.
• It destroys harmful microbes.

🎯 Exam Tip: When listing benefits of cooking, focus on digestion, taste/texture, and hygiene/safety.

Question 2. Why should we drink milk?
Answer: We should drink milk because it offers many health benefits, such as strengthening our bones and teeth, helping to maintain normal blood pressure, reducing the risk of heart disease, and providing a good source of energy. Milk is packed with essential nutrients like calcium.

• It strengthens bones and teeth.
• It maintains blood pressure.
• It reduces the risk of heart disease.
• It is a source of energy.

🎯 Exam Tip: Highlight milk's key benefits for bone health, heart health, and overall energy when explaining why it's good to drink.

VI. Projects :

Question 1. List the gadgets you have used.
Answer: Some electronic gadgets I have used include a laptop, mobile phones, camera, speaker, tablets, computers, electric torch, pen drive, remote, and television. Each gadget serves a different purpose in daily life.

• Laptop
• Mobile phones
• Camera
• Speaker
• Tablets
• Computers
• Electric torch
• Pen drive
• Remote
• Television

🎯 Exam Tip: When listing gadgets, think about different categories such as computing, communication, entertainment, and utilities.

Question 2. Tabulate different kinds of milk products.
Answer: Milk is used to create a wide variety of products, each with unique textures and flavors. Some examples include butter, cheese, yogurt, frozen desserts, milk chocolates, milk sweets, and paneer. These products are enjoyed globally in various cuisines.

• Butter
• Cheese
• Yogurt
• Frozen desserts
• Milk chocolates
• Milk sweets
• Paneer

🎯 Exam Tip: When listing milk products, consider both solid and semi-solid forms, as well as those used in desserts and cooking.

Try to Answer (Text Book Page No. 115)

Question 1. Milk is a rich source of _________ (Calcium / Iron)
Answer: Calcium
In simple words: Milk has a lot of calcium, which is good for our bones.

🎯 Exam Tip: Calcium is crucial for bone health, and milk is one of its best natural sources.

Question 2. Milk contains _________ and _________.
Answer: Protein, fat, vitamin D
In simple words: Milk has protein, fat, and Vitamin D inside it. These are all good for our body.

🎯 Exam Tip: Besides calcium, milk also provides protein for growth, fats for energy, and Vitamin D for calcium absorption.

Try to Answer (Text Book Page No. 117)

Question 1. _________ and _________ are examples of raw food.
Answer: Carrot, Cucumber
In simple words: Carrots and cucumbers are raw foods because we can eat them without cooking.

🎯 Exam Tip: Remember that raw foods are those that can be consumed directly without any cooking process.

Question 2. _________ and _________ are examples of cooked food.
Answer: Vegetable curry, bread
In simple words: Vegetable curry and bread are examples of foods that have been cooked.

🎯 Exam Tip: Cooked foods typically involve heat preparation, which changes their texture and makes them easier to digest.

Try to Answer (Text Book Page No. 119)

Question 1. Bread is _________ (low / high) fat food.
Answer: low
In simple words: Bread generally has a small amount of fat in it.

🎯 Exam Tip: Most traditional breads made from flour, water, and yeast are considered low in fat compared to other foods.

Question 2. Biscuits are made from _________ (wheat flour / rice flour).
Answer: wheat flour
In simple words: Biscuits are usually made using flour that comes from wheat.

🎯 Exam Tip: While some specialized biscuits use rice flour, wheat flour is the most common ingredient for traditional biscuits.

Question 3. _________ is associated with birthday celebrations (cake / biscuit).
Answer: cake
In simple words: People often eat cake during birthday celebrations.

🎯 Exam Tip: Cakes are a traditional sweet treat commonly served at birthdays and other festive occasions.

Try to Answer (Text Book Page No. 121)

Question 1. butter, curd, sugar, milk.
Answer: Suger
In simple words: Sugar is the odd one out here because butter, curd, and milk are all dairy products, while sugar is a sweetener.

🎯 Exam Tip: Look for the category that the majority of items belong to and identify the one that does not fit.

Question 2. fruits, carrot, ground nuts, rice.
Answer: Rice
In simple words: Rice is the odd one out because fruits, carrots, and groundnuts can be eaten raw, but rice needs to be cooked.

🎯 Exam Tip: Consider the preparation method (raw vs. cooked) as a distinguishing factor for food items.

Question 3. chocolate, bread, biscuit, cake.
Answer: Chocolate
In simple words: Chocolate is the odd one out because bread, biscuit, and cake are all baked items made from flour, while chocolate is a confectionary item.

🎯 Exam Tip: Identify the common category (e.g., baked goods) that most items fit into to find the outlier.

Question 4. cutting, boiling, steaming, frying.
Answer: Cutting
In simple words: Cutting is the odd one out because boiling, steaming, and frying are all methods of cooking, while cutting is a method of food preparation.

🎯 Exam Tip: Group similar actions together (e.g., cooking methods) to identify the one that belongs to a different category (e.g., preparation method).

Question 5. Laptop, T.V., Smart phone, Milk.
Answer: Milk
In simple words: Milk is the odd one out because a laptop, TV, and smartphone are all electronic gadgets, while milk is a food item.

🎯 Exam Tip: Categorize the items (e.g., electronics, food) to easily spot the one that doesn't fit.

II. Say true or false :

Question 1. Calcium helps to build healthy bones and teeth
Answer: True
In simple words: Yes, calcium is very important for making our bones and teeth strong.

🎯 Exam Tip: Remember calcium's direct role in bone and teeth development and maintenance.

Question 2. Bread is an example of baked food items.
Answer: True
In simple words: Yes, bread is made by baking it in an oven.

🎯 Exam Tip: Baking is a common method for preparing bread, using dry heat.

Question 3. Yeast is used to make biscuits.
Answer: False
In simple words: No, yeast is mostly used for making bread, not biscuits. Baking powder or soda is used for biscuits.

🎯 Exam Tip: Differentiate between leavening agents: yeast for bread's airy texture, and baking powder/soda for biscuits/cakes.

Question 4. Biscuit is a baked food
Answer: True
In simple words: Yes, biscuits are cooked by baking them.

🎯 Exam Tip: Like bread and cakes, biscuits are prepared through the process of baking in an oven.

Question 5. Tablets used to read books
Answer: True
In simple words: Yes, tablets can be used to read books, often through e-reader apps.

🎯 Exam Tip: Tablets are versatile devices, capable of various functions including reading, gaming, and internet browsing.

Question 6. Pen drive is not a gadget
Answer: False
In simple words: No, a pen drive is a small electronic gadget used for storing data.

🎯 Exam Tip: A gadget is any small mechanical or electronic device with a practical use; a pen drive fits this definition.

III. Match the following :

Question 1.

🎯 Exam Tip: Match each food item to its most characteristic property or primary nutrient source.

Question 2.

🎯 Exam Tip: Connect each nutrient to its primary function or a common food source to ensure correct matches.

IV. Choose the correct answer :

Question 1. Milk has _________ taste.
(a) Sweet
(b) Sour
(c) Bitter
(d) Tasteless
Answer: (a) Sweet
In simple words: Milk has a naturally sweet taste because it contains a type of sugar called lactose.

🎯 Exam Tip: The natural sweetness of milk comes from lactose, which is a sugar found in dairy products.

Question 2. Milk has a special sugar called
(a) Lactose
(b) Glucose
(c) Fructose
(d) Galactose
Answer: (a) Lactose
In simple words: The unique sugar found in milk is called lactose. This is what gives milk its slightly sweet taste.

🎯 Exam Tip: Lactose is the specific disaccharide sugar that is naturally present in milk and dairy products.

Question 3. _________ in milk helps to maintain the bones.
(a) Vitamin-D
(b) Vitamin-C
(c) Vitamin-A
(d) Vitamin-B
Answer: (a) Vitamin-D
In simple words: Vitamin-D in milk is important for keeping our bones strong and healthy. It helps our body use calcium better.

🎯 Exam Tip: Remember that Vitamin-D is crucial for calcium absorption, which directly supports bone health.

Question 4. Bread spoils _________ faster when kept in fridge.
(a) 6 times
(b) 2 times
(c) 4 times
(d) None of the options
Answer: (a) 6 times
In simple words: Bread goes bad much faster in the fridge, about six times quicker, compared to keeping it at room temperature. This is because the cold temperature causes it to stale rapidly.

🎯 Exam Tip: While refrigeration preserves many foods, it can cause starches in bread to crystallize faster, leading to quicker staling.

V. Fill in the blanks :

Question 1. Milk helps to build _________.
Answer: Muscles
In simple words: Milk has protein, which is an important nutrient that helps our bodies build and repair muscles.

🎯 Exam Tip: Milk is a good source of protein, essential for muscle growth and repair, especially in growing children.

Question 2. Fat present in the milk is called _________.
Answer: Butter
In simple words: The fat part of milk is used to make butter. Butter is a dairy product known for its rich fat content.

🎯 Exam Tip: Butter is primarily composed of milk fat, which is separated from other milk components through churning.

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

Question 1. What are the sources of milk?
Answer: Milk mainly comes from mammals like cows, goats, and buffaloes. However, milk can also be obtained from other sources like plants, such as soya milk, nut-based milk, and seed-based milk. These plant-based milks are popular alternatives.
In simple words: Milk comes from animals like cows, but also from plants like soy, nuts, and seeds.

🎯 Exam Tip: Remember to include both animal and plant-based sources when asked about milk's origins.

Question 2. Write 4 health benefits of milk.
Answer: Milk has several health benefits. It strengthens bones and teeth, helps maintain blood pressure, reduces the risk of heart disease, and serves as a good source of energy. These benefits make milk an important part of a healthy diet.

• It strengthens bones and teeth.
• It maintains blood pressure.
• It reduces the risk of heart disease.
• It is a source of energy.

🎯 Exam Tip: Focus on milk's key contributions to structural health (bones, teeth) and systemic health (blood pressure, heart, energy).

Question 3. What are the main ingredients of biscuit?
Answer: The main ingredients for biscuits typically include flour, sugar, butter, water, milk, baking powder, and various flavors. These ingredients are mixed and baked to create the crispy texture of a biscuit.
In simple words: Biscuits are mostly made from flour, sugar, butter, water, milk, and baking powder.

🎯 Exam Tip: When listing ingredients for baked goods, include flour (the base), a sweetener, a fat, and a leavening agent.

Question 4. What is the use of pen drive?
Answer: A pen drive is a small electronic gadget used for storing and transferring any type of digital file to and from a computer. It is portable and convenient for carrying data.
In simple words: A pen drive is a small device used to save files and move them between computers.

🎯 Exam Tip: The main purpose of a pen drive is portable data storage and transfer between digital devices.

Question 5. Write the classification of milk.
Answer: Milk is classified based on the amount of fat it contains. The common classifications are Whole milk (full fat), Low-fat milk (reduced fat), and Fat-free milk (skim milk). These options cater to different dietary needs.
In simple words: Milk is grouped into whole milk, low-fat milk, and fat-free milk, depending on how much fat it has.

🎯 Exam Tip: Classifications of milk primarily revolve around its fat content, leading to terms like 'whole', 'low-fat', and 'skim'.

Question 6. What is meant by raw food?
Answer: Raw food refers to food items that do not require cooking before they are eaten. Examples include fruits, carrots, and groundnut seeds. These foods are consumed in their natural state.
In simple words: Raw food means food that you can eat without cooking it first. Fruits and carrots are examples.

🎯 Exam Tip: Define raw food by the absence of cooking and provide clear examples of items eaten in their natural state.

Question 7. What is a gadget?
Answer: A gadget is a small electronic machine or device that performs a useful function. Gadgets make our daily lives more enjoyable and convenient, such as laptops and phones. They are designed to simplify tasks or provide entertainment.
In simple words: A gadget is a small electronic device that does something useful and fun, like a laptop or phone.

🎯 Exam Tip: When defining a gadget, emphasize its small size, electronic nature, and its utility or entertainment value.

Question 8. What is the use of the portable music player?
Answer: A portable music player is used to store and play thousands of songs. It allows us to listen to music anywhere and anytime, providing personal entertainment on the go.
In simple words: A portable music player lets us keep and listen to many songs wherever we want, whenever we want.

🎯 Exam Tip: Focus on the twin benefits of a portable music player: large storage capacity and the ability to listen anywhere.

VII. Answer the detail :

Question 1. Write a note on Bread.
Answer: Bread is a very common food item made by baking dough. It is a vital source of energy, especially for sick people, and is one of the oldest foods prepared by humans. Bread is considered a low-fat food and contains necessary nutrients for good health and proper development. To make bread, main ingredients like wheat flour, yeast, water, sugar, and salt are needed.

• Bread is a common food product prepared from dough by baking. It is an important source of energy for sick people. It is also one of the ancient foods made by humans. Bread is a low-fat food.
• Bread has the nutrients required for normal development and good health.
• To make bread we need wheat flour, yeast, water, sugar and salt.

🎯 Exam Tip: When describing bread, mention its origin (baking dough), nutritional value (energy, nutrients, low-fat), historical significance, and key ingredients.

Question 5. Write the classification of milk.
Answer: Milk is categorized by how much fat it contains. These types include whole milk, low-fat milk, and fat-free milk. Each type offers different nutritional values based on its fat content.
In simple words: Milk is grouped by its fat. We have whole milk, low-fat milk, and fat-free milk.

🎯 Exam Tip: Remember the three main classifications of milk are based on their fat content: whole, low-fat, and fat-free.

Question 6. What is meant by raw food?
Answer: Raw food refers to edible items that do not require cooking before being consumed. These foods often keep more of their natural vitamins. Examples include fruits, carrots, and groundnut seeds.
In simple words: Raw food is food you can eat without cooking. Fruits and carrots are good examples.

🎯 Exam Tip: When defining raw food, highlight that it needs no cooking and provide clear, simple examples.

Question 7. What is a gadget?
Answer: A gadget is a small electronic device or machine designed to perform a specific useful function. Gadgets often make our daily lives easier and more fun. For instance, laptops and phones are common gadgets.
In simple words: A gadget is a small electronic thing that helps us do useful tasks and makes life more fun. Laptops and phones are gadgets.

🎯 Exam Tip: Define a gadget by its size (small), nature (electronic device), and purpose (useful function), and include common examples.

Question 8. What is the use of the portable music player?
Answer: A portable music player can store and play a large number of songs. This allows people to listen to their favorite music wherever and whenever they want. They make music easily accessible on the go.
In simple words: A portable music player holds many songs. You can listen to music on it anywhere, anytime.

🎯 Exam Tip: Focus on two key functions: storing many songs and enabling music listening anytime, anywhere.

VII. Answer The Detail :

Question 1. Write a note on Bread.
Answer: Bread is a widely consumed food item made by baking dough. It serves as an important energy source, especially for those who are unwell. This food has been made by people for a very long time and is naturally low in fat. Bread contains important nutrients needed for healthy growth and well-being. To prepare bread, ingredients like wheat flour, yeast, water, sugar, and salt are typically used.
In simple words: Bread is a baked food from dough. It gives energy, has nutrients, and is low in fat. We use flour, yeast, water, sugar, and salt to make it.

🎯 Exam Tip: When writing about bread, mention its preparation, its role as an energy source, its nutritional value, and the key ingredients used.