Term 1 Chapter 4 | 4th Science - Science in Everyday Life | 4th Science : Term 1 Unit 4 : Science in Everyday Life
Chapter: 4th Science : Term 1 Unit 4 : Science in Everyday Life
Science in Everyday Life
Unit 4: Science in Everyday Life
Learning Objectives
After learning this lesson, students will be able to
- know the nutritional value of milk
- explore the benefits of cooking
- learn about baking of bread, biscuit and cake
- know about gadgets used in daily life
Let us Recall
I. Milk
Milk is produced by some animals for nourishing their young ones. Milk from many animals is used by humans. Cow’s milk is used commonly.
1. Sources of Milk
Milk is primarily obtained from mammals. They are obtained from other sources too. Examples: Soya milk, nut and seed based milk.
Based on the amount of fat present in the milk, it can be classified as Whole milk, Low fat milk and Fat free milk.
2. Nutritional value of Milk
Milk contains water, sugar, protein, fat, vitamins and minerals.
- Sugar: Milk has sweet taste because it has a special sugar called lactose.
- Protein: It helps to build muscles.
- Fat: Fat present in the milk is called butter. Butter is more delicious than any other fat.
- Vitamins: Vitamin-D in milk helps to maintain the bones.
- Minerals: Calcium is a mineral. It helps to build healthy bones and teeth.
Milk in daily life
1. Primary food for babies.
2. Gives curd, butter, butter milk and ghee.
3. Health drink for adults and sick people.
4. Used for making cheese, paneer and milk sweets.
5. Used in Ice cream and Chocolates.
6. Used during festivals and ceremonies.
3. Health Benefits of milk
- It strengthens bones and teeth.
- It maintains blood pressure.
- It reduces the risk of heart disease.
- It is a source of energy.
Try to Answer
1. Milk is a rich source of Calcium. (Calcium / Iron)
2. Milk contains sugar, protein and fat.
II. Food materials
What is food? Food is one of the basic needs of our life. Food provides energy. It is usually made by cooking plants or animals. It contains essential nutrients to keep our body healthy.
Needs of food
- Gives energy
- Promotes growth
- Improves immunity
- Helps our body repair itself
Food can be classified into two types:
1. Raw Food - Raw food is the food that does not have to be cooked to eat. Examples: Fruits, carrot, ground nut seeds.
2. Cooked food - Cooked food is the food that has been cooked to eat. Examples: Rice, vegetable curry, bread.
Let us Do
Simple tasks such as pouring liquid into the bowl, sprinkling pepper on the of the omelet or dosa, peeling off onions, powdering coriander seeds can be done by you. Always help the elders in the kitchen.
1. Cooking
Do you know how many food items are their that you will not be able to eat without cooking? Cooking is important. It makes food suitable for consumption.
Methods of Cooking
Boiling, Steaming, Frying, Deep frying, Roasting, Grilling
Benefits of Cooking
Cooking causes many useful changes in food.
- It makes nutrients ready for digestion.
- It helps to make food in the desired texture, flavour and taste.
- It destroys harmful microbes.
Try to Answer
1. Fruits and carrots are examples of raw food.
2. Rice and bread are examples of cooked food.
Let us discuss
Look at the things shown in the picture and discuss their uses with your friends.
III. Baking of Bread, Biscuit and Cake
Baking is a method of cooking. We use dry heat to bake. Bread, biscuit and cake are some examples of baked food items.
1. Bread
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.
2. Biscuit
Biscuit is a small, flour – based baked food. They are generally made of wheat flour or oats and sweetened with sugar.
The main ingredients of biscuit are flour, sugar, butter, water, milk, baking powder and flavours. Biscuits are salty or sweet. Some biscuits have cream in between.
3. Cake
Cake is a baked dessert. It is like a sweet bread. There are many varieties of cake with specific ingredients. We cake during celebrations.
The common ingredients of the cake are flour, sugar, eggs, oil, baking powder and flavouring agent.
Try to Answer
1. Bread is low (low / high) fat food.
2. Biscuits are made from wheat flour ( wheat flour / rice flour).
3. Cake is associated with birthday celebrations (cake / biscuit).
Activity
Visit a bakery near you and learn about baking of bread, biscuit and cakes.
IV. Gadgets
Think of the electronic devices we use everyday.
The phone that we use, the camera that goes with us on every vacation, the TV that we watch for fun all these devices that we use are called gadgets. A gadget is a small electronic machine or device which does something useful. Number of gadgets have changed our lives. They make our life enjoyable.
Examples: Laptop, Phone, Camera, Pen drive, Speaker
Smart Phones
Apart from communication, smart phones have the ability to access the internet and store files, take photos, track location and much more.
Portable Music Player
It stores and plays thousands of songs. We can listen to songs anywhere, anytime.
Tablets
People use tablets to read books, play games and watch videos.
Pen Drive
It is a small gadget used for storing and transferring any type of file in / from a computer.
Electric Torch
Portable hand-held electric light. Torch is used to provide light in the dark places when it is switched on.
Try to Answer
Write the names of the given gadgets.
(Web cam, Remote, Speaker, Camera, Headphone)
