Food: Where Does It Come From
We eat many variety of food, such as rice, bread, pulses, meat, fish, etc. All these food items either come from plant or animals.
Raw materials used to make food are called Ingredient of foods. There are many types of ingredients which are used to make food items.
Boiled rice is made with most simple ingredients. It is just boiled to cook. ....
Components of Food
There are five main components of food; these are Carbohydrates, fats, proteins, vitamins, and minerals.
Materials which give nutrition are called nutrients. There are mainly five types of nutrients. These are carbohydrates, fats, proteins, vitamins and minerals. Nutrients found in food are called COMPONENTS OF FOOD. Different food items give different types of NUTRIENTS. . . .
Fibre to Fabric
Clothes are made of fabric. And fabrics are made of fibres. Fabric is not only used in making of clothes, rather it is used in making bed–sheets, bags, door mats, mats, and many more items.
There are many types of fabrics. Wool, cotton, silk, jute, nylon, etc. Some fabrics appear shiny while some appear very dull. Some fabrics keep us warm while some of the fabric we like to use in summer.
Natural fibres come from natural sources, like plants and animals while Artificial fibres is made in laboratory. Artificial Fibre is known as Man-made fibre also. . . .
Sorting Materials into Groups
There is large number of objects around us. These objects may be living or nonliving. Some are natural, some are manmade, some are hard and some are soft. Different things have different shape and size. Chair, table, cycle, toys, stone, books, cloth, fan, computer and many other things are found around us.
Materials or substances can be classified on the basis of their properties. We can classify various materials according to their physical state. There are three physical states of material. These three states are called solid, liquid and gas. ....
Separation of Substances
Materials can be either pure substances, or a mixture of two or more substances. A pure substances has only one kind of particles in it. Most materials which occur on the earth are mixtures of two or more substances.
Mixture are two types:
Mixtures in which the particles of the substances present cannot be seen are called homogeneous mixtures. While mixtures in which the particles of the substances present can be seen easily are called heterogeneous mixtures. Some heterogeneous mixtures are, Water +oil, Chalk + water, Dust in air, etc. ...
Geting to Know Plants
There are millions of plants on the earth. It is plants which makes our earth green. Plants are very useful and beneficial to us. Plants give us food, wood, oxygen, and many other things. Plant help in maintaining our environment by absorbing carbon dioxide from the air and released oxygen into the air. If we start making the list of benefits of plants, the list will become endless.
Life exists on earth because of plants. Life cannot be imagined without existence of plants. As so far known, it is only earth where plant exists and consequently life.
There are millions of varieties of plants found. And it is not possible to study them without classification.
There are four types of plants on the basis of height, shape, size and structure. These are Herbs, Shrubs, Trees, Climbers and Creepers. ....
Changes Around Us
When a small plant grows into tree, we call it change. When ice melts into water, we call it change. When water freezes into ice, we call it change. When a bulb is lighted, we call it change. Even polishing of shoes and wearing a new dress or changing a dress are also examples of changes.
We see many natural changes every day, such as sun rises in the east and sets in the west, the size of moon changes always.
Thus, we see many things changing around us continuously. In fact without change life is possible. Thus it becomes necessary to study the changes scientifically. To study changes in systematic way, changes are divided into various category, such as slow change, fast change, reversible change, irreversible change, etc. ...
Living Organisms And Their Surroundings
All living things show certain common characteristic such as need of food, growth, respiration, response to stimuli, reproduce, excrete body wastes, etc.
Apart from food and water every animal needs a certain type of environment or surrounding where it can live and flourish. Every plant and animal is fit to live in a certain type of surrounding.
The meaning of habitat is a home (dwelling place). Several kinds of plants and animals may share, i.e. live in the same habitat. Habitat is the part of the total; environment of the region.
There are three main types of habitat in the biosphere. (a) Terrestrial habitat or Land habitat (b) Aquatic habitat or water Habitat and (c) Aerial or arboreal habitat
Organisms that live on land are called as terrestrial organisms. For example: man, tiger, trees, etc. live on land, thus these are called terrestrial organisms. ...
All animals have movement. Animals move from one place to other place in search of food, in search of suitable environment, in search of water, in search of partners, and to protect themselves from enemies, etc.
Locomotion and Movement: Movement of whole body from one place to other place is called locomotion, while change in the position of part of body with respect to whole body is called movement. Movement is a characteristic feature of all living things.
There are many kinds of movements in our body. For example, human blink their eyes, heart beats, breathing air, eating food, turning head etc.
These types of movements possible in our body are because of presence of joints between two bones.
All animals are not similar in shape. Skeleton gives an animal a particular shape. Similarly, our body has a peculiar shape because of our skeleton. Without skeleton our body would be a lump of flesh. ....
Fun With Magnet
The word magnet came from a Greek name "Manges".
A piece of iron or material having similar properties as iron, which can attract other materials made of iron or nickel or cobalt is known as Magnet.
Magnet has many use in the daily life. In fact, we are surrounded with magnets. There are many machines which run on magnet, for example electric fan, electric motor, electric generator, etc.
The earth on which we live is a strong and very big magnet.
Natural magnets are made from magnetite.Magnetite is a rock mineral. Magnetite contains iron and it has a property to attract iron and other magnetic materials. Later process of making magnets from iron discovered. Man-made magnets are called artificial magnets. . . .
Motion and Measurement of Distances
From the beginning people had been moving from one place to another place basically in search of food, even today people move from one place to another to earn their livelihood and ultimately in the search of food. This means that movement is one of the prime necessities of humans.
In ancient times the measurements were done using gilli danda, danda, hand span, foot span, the distance of a step, a cubit, etc.
In 1790, the French introduced a standard unit of measurement which has been accepted worldwide. This standard unit of measurement is called the metric system. The metric system of measurement is known as International System of Units also. The International System of Units is abbreviated as SI Unit in short. . .
Light, Shadows and Reflections
It is the light that helps us to see an object. Without light, we cannot see anything.
Rays of light get reflected after falling on an object and reach our eyes, this enables us to see the object. If there is no light, we will not be able to see the object because no light will reach our eyes.
This is the cause that in a dark room we cannot see any object.
During the daytime, the Sun is in the sky above us. Light coming from the sun falls on objects. After falling on the objects some of the light gets reflected and reaches our eyes, this enables us to see the objects in the daytime.
We can observe with the setting of the Sun it becomes difficult to see the objects outside. After setting the Sun gradually light gets dim and finally, there is no light available around us. Because of the absence of light, no light falls on an object and we are unable to see the object. . .