Extra Questions for Class 7 Science CBSE Extra Questions for Class 7 Science Here you can get E xtra Questions for Class 7 Science based on NCERT Text book for Class VII. Science Class 7 Extra Questions are very helpful to score high marks in board exams. Here we have covered Extra Questions on all topics for Class 7 Science subject. Question from very important topics is covered by NCERT Exemplar Class 7. You also get an idea about the type of questions and method to answer in your Class 7th examination.
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Nutrition in Plants Class 7 Extra Questions Nutrition in Animals Class 7 Extra Questions Fibre to Fabric Class 7 Extra Questions Heat Class 7 Extra Questions Acids, Bases and Salts Class 7 Extra Questions Physical and Chemical Changes Class 7 Extra Questions Weather, Climate and Adaptations of Animals to Climate Class 7 Extra Questions Winds, Storms and Cyclones Class 7 Extra Questions Soil Class 7 Extra Questions Respiration in Organisms Class 7 Extra Questions Transportation in Animals and Plants Class 7 Extra Questions Reproduction in Plants Class 7 Extra Questions Motion and Time Class 7 Extra Questions Electric Current and Its Effects Class 7 Extra Questions
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Light Class 7 Extra Questions Water: A Precious Resource Class 7 Extra Questions Forests: Our Lifeline Class 7 Extra Questions Wastewater Story Class 7 Extra Questions
1. Nutrition in Plants Class 7 Extra Questions CBSE Nutrition in Plants Class 7 Extra Questions Plant prepares their food themselves with the help of water, carbon dioxide and minerals. Nutrients are necessary for growth, help in repairing damaged parts and provide energy to the body.
Nutrition is the mode of taking food by an organism and its utilization by the body. There is two types of mode of nutrition, autotrophic and heterotrophic. Autotrophic organisms prepare their food themselves from simple substances like plants, while animals and another organism, which depend on readymade food prepared by the plants are called heterotrophs.
Photosynthesis is the process by which plants make food d. In this process, the conversion of light energy into chemical energy takes place. In photosynthesis, carbon dioxide and water combine in the presence of light to form sugar. Please refer N utrition in Plants
Class 7 Extra Questions for more information.
2. Nutrition in Animals Class 7 Extra Questions CBSE Nutrition in Animals Class 7 Extra Questions
● Animal nutrition includes a nutrient requirement, mode of intake of food and its utilization in the body. ● The steps involved in digestion are Ingestion, digestion, assimilation, absorption, and egestion.
● The human digestive system consists of the alimentary canal and associated digestive glands. ● The alimentary canal consists of Mouth, buccal cavity, esophagus, stomach, small intestine, large intestine ending in rectum and anus. Please refer Nutrition in Animals Class 7 Extra Questions for more information.
3. Fibre to Fabric Class 7 Extra Questions CBSE Fibre to Fabric Class 7 Extra Questions Fibre is a long and strong hair-like strand obtained from natural sources or man-made sources. Fibres are classified into two type’s namely natural fibres and synthetic fibres. Natural fibres are further classified as plant fibres and animal fibres. Jute, cotton, etc. are some plant fibres whereas wool, silk, etc. are some animal fibres. The common synthetic fibres made by human-beings are rayon, nylon, etc. Wool is obtained from the fleece of wool yielding animals like sheep, yak, etc. which are used to make fabrics, jackets, shawls, etc. The processing of fibres to wool is done in nine steps which include shearing, scouring, sorting, drying, carding, dyeing, roving, spinning and weaving. Please refer Fibre to Fabric Class 7 Extra Questions for more information.
4. Heat Class 7 Extra Questions CBSE Heat Class 7 Extra Questions Heat is a form of energy that causes a sensation of warmth. We use our sense of touch to decide which object is hotter than the other. The degree of hotness or coldness of a body is called temperature. Temperature is measured by a device called thermometer. Thermometers are classified further on the basis of their uses. Thermometers work on the principle of transfer of heat. Heat is transferred from a hotter object to a colder object. The flow of heat does not take place when the two objects are at the same temperature. Heat is transferred between two bodies by conduction, convection and radiation. Heat transfer in solids takes place through conduction. The substances are
divided into conductors and insulators on the basis of their conduction. Please refer
Heat Class 7 Extra Questions for more information.
5. Acids, Bases and Salts Class 7 Extra Questions CBSE Acids, Bases and Salts Class 7 Extra Questions Acids are the chemical compounds that taste sour and turn blue litmus red. They are acidic in nature. Apple, lemon, orange, tomato, etc. are some examples of natural acids whereas curd, soft drinks, vinegar, etc. are some examples of man-made substances containing acids. Acids are classified on the basis of their strength, origin and concentration as strong and weak acids, organic and inorganic acids, dilute and concentrated acids respectively. Sulphuric acid, nitric acid and hydrochloric acid are the commonly known acids that are used in various fields. Bases are bitter in taste, soapy to touch and turn red litmus blue. They are basic in nature. Sodium hydroxide, potassium hydroxide, calcium hydroxide are some of the common examples of bases which are used in various fields. Please refer Acids, Bases and Salts Class 7 Extra Questions for more information.
6. Physical and Chemical Changes Class 7 Extra Questions CBSE Physical and Chemical Changes Class 7 Extra Questions Every day we come across many changes in our surroundings. These changes may involve one or more substances. Changes are classified into two categories namely physical and chemical changes. Colour, shape, size and physical state of substance are called the physical properties. Melting of ice-cream, boiling of water, dissolution of sugar in water, melting of wax are some common examples of a physical change. These changes are reversible changes i.e. the product formed after the change can be converted into the reactant. A change in which a new substance with different properties is formed is called a chemical change. This change is irreversible able in nature. Burning of paper, rusting of iron, curdling of milk, burning of coal are some
examples of a chemical change. Please refer P hysical and Chemical Changes Class 7
Extra Questions for more information.
7. Weather, Climate and Adaptations of Animals to Climate Class 7 Extra Questions CBSE Weather, Climate and Adaptations of Animals to Climate Class 7 Extra Questions
● The day-to-day condition of the atmosphere at a place with respect to the temperature, humidity, rainfall, wind-speed, etc., is called the weather at that place. ● Weather report carries information about the maximum temperature, minimum temperature, humidity and rainfall during the past 24 hours. All changes in the weather are caused by the sun. ● Variations of weather in a region over a long period of time are termed as climate. ● Hot and dry regions receive the least amount of rainfall. They are called desert. Please refer W eather, Climate and Adaptations of Animals to Climate Class 7 Extra Questions for more information.
8. Winds, Storms and Cyclones Class 7 Extra Questions CBSE Winds, Storms and Cyclones Class 7 Extra Questions
● The moving air is known as wind. Winds are caused by the variation in air pressure. The pressure applied by the air on the bodies every time in all the directions is known as air pressure. ● The increased wind speed is accompanied by reduced air pressure. Air moves from the region of high pressure towards the region of low pressure. The resistance offered by air to a moving object is known as air resistance. ● Air has a property to expand on heating and contracts on cooling. The uneven heating of air results in the generation of wind currents. This phenomenon of uneven heating makes the winds to blow from poles to the equator as s equator is hotter than the poles. The same phenomenon is responsible for monsoon winds which carry water to rain. High-intensity winds may raise thunderstorms and cyclones.
Please refer W inds, Storms and Cyclones Class 7 Extra Questions for more information.
9. Soil Class 7 Extra Questions CBSE Soil Class 7 Extra Questions Soil is the topmost layer of the earth's surface. It consists of rocks and mineral particles mixed with organic matter. Soil formation begins with the breakdown of rocks and other materials into smaller pieces on the surface of the earth. Soil supports the growth of plants. It is home to many organisms and essential for agriculture.
Polythene bags and plastics pollute the soil and kill the microorganisms that live in the soil. Industries empty their sludge and pollutants into the air, soil and water. Please refer
Soil Class 7 Extra Questions for more information.
10. Respiration in Organisms Class 7 Extra Questions CBSE Respiration in Organisms Class 7 Extra Questions The process of breakdown of food in the cell with the release of energy is called cellular respiration. It is of two types namely, aerobic respiration and anaerobic respiration.
Aerobic respiration is a complex process of chemical reactions, in which oxygen is used to break down glucose into carbon dioxide and water. The energy is released in the form of ATP.
Respiration sometimes occurs without oxygen, and this is called anaerobic respiration. In this type of respiration, glucose is partially broken down and the end products are lactic acid or ethanol (alcohol), carbon dioxide and energy; this process is known as
fermentation. Yeasts are single-celled organisms which respire anaerobically and yield alcohol during this process. Please refer Respiration in Organisms Class 7 Extra
Questions for more information.
11. Transportation in Animals and Plants Class 7 Extra Questions CBSE Transportation in Animals and Plants Class 7 Extra Questions The transport of food and other substances in the body is done with the help of the circulatory system. It consists of blood vessels, heart and blood.
Blood consists of plasma, RBCs, WBCs and platelets. Plasma is the fluid part of the blood. Red blood cells (RBCs) contain a red pigment called haemoglobin which carries oxygen from the lungs to the cells of the body. White Blood cells (WBCs) fight against germs. Platelets help in the formation of a clot.
The network of tubes through which the blood circulates in the body is called blood vessels. The blood vessels include arteries, arterioles, capillaries, venules and veins. Arteries carry blood to all parts of the body from the heart while veins bring blood back to the heart from all parts of the body. An English physician, William Harvey discovered blood circulation. Please refer T ransportation in Animals and Plants Class 7 Extra
Questions for more information.
12. Reproduction in Plants Class 7 Extra Questions CBSE Reproduction in Plants Class 7 Extra Questions Reproduction is the biological process by which new individual organisms are produced and there are different modes of reproduction in plants.
Flowers are the reproductive parts of the plants. A flower may have either the male part of the female part or both male and female parts. The flowers, which contain either only the pistil or only the stamens are called unisexual flowers, while which contain both stamens and pistil are called bisexual flowers.
Reproduction in plants is categorized into two types: Asexual reproduction and Sexual reproduction In asexual reproduction, plants can give rise to new plants without the involvement of seeds. Types of asexual reproduction in plants include vegetative propagation, budding, fragmentation and sporulation. Please refer R eproduction in
Plants Class 7 Extra Questions for more information.
13. Motion and Time Class 7 Extra Questions CBSE Motion and Time Class 7 Extra Questions Motion is the change in the position of an object with respect to its surroundings. It is the distance moved by an object or its displacement. The distance moved by an object in a unit time is called its speed. The speed of an object helps to compare whether a body is moving fast or slow. Speed of an object is the ratio of the distance travelled it to the time taken to cover the particular distance. Please refer M otion and Time Class 7
Extra Questions for more information.
14. Electric Current and Its Effects Class 7 Extra Questions CBSE Electric Current and Its Effects Class 7 Extra Questions Electric current is the flow of charge through an electric circuit. An electric circuit is made up of various components known as electrical components. It is convenient to represent electrical components by symbols. The representation of an electric circuit with the help of
symbols is called a circuit diagram. The current in a circuit is made to flow by using an electric cell. An electric cell is a device used to convert its stored chemical energy into electrical energy. The combination of two or more cells is called a battery.
An electric current flowing through a conductor produces various effects. When an electric current flows thr rough a conductor, the conductor gets heated. This is called the heating effect of current and has many applications. Materials having low melting point are used to makes wires used in a safety device called fuse which prevents fire and damage to electric appliances. Please refer E lectric Current and Its Effects Class 7
Extra Questions for more information.
15. Light Class 7 Extra Questions CBSE Light Class 7 Extra Questions Light is a form of energy that enables us to see the things around us. Light travels along a straight line. Reflection of light takes place when light rays fall on the surface of an object and are bounced back into the same medium.
The rays reflected from an object make an optical representation of the object called image. An image which can be obtained on the screen is called a real image. The image which cannot be obtained on a screen is called a virtual image. Please refer L ight Class 7
Extra Questions for more information.
16. Water: A Precious Resource Class 7 Extra Questions CBSE Water: A Precious Resource Class 7 Extra Questions
● Water is very important in sustaining life on earth. 22 March is celebrated as the world water day. ● Water provides habitat to several animals and plants. Though 71% of the earth is covered with water the amount of potable water is less (about 0.006%). ● Water exists in three forms namely, solid (in the form of snow or ice), liquid (water in oceans, rivers, lakes etc.) and gaseous (vapours in the air) forms. Please refer
Water: A Precious Resource Class 7 Extra Questions for more information.
17. Forests: Our Lifeline Class 7 Extra Questions CBSE Forests: Our Lifeline Class 7 Extra Questions Forests serve as green lungs and water purifying systems in nature. They provide a home for many animals and plants. E.g., boar, bison, jackals, porcupine, elephants live in the deeper areas of the forest. They are the lifeline for the forest-dwelling communities.
Forests play an important role in maintaining the atmosphere and in other different fields. They provide oxygen to the atmosphere, help in bringing good rainfall in neighboring areas. Climate, water cycle and air quality are influenced by the forests. They protect soil from erosion and provide habitat to a large number of animals. They serve as a source of medicinal plants, timber and many other useful products. Forests also act as a natural absorber of rainwater and allow it to seep. Please refer Forests: Our Lifeline
Class 7 Extra Questions for more information.
18. Wastewater Story Class 7 Extra Questions CBSE Wastewater Story Class 7 Extra Questions
Water is vital for life. Earth is the only place in the universe where life exists and the main reason for this is the presence of water on the earth. Earth is called the “water planet” because 80% of its surface is covered with water or ice. 22 March has been declared as “World Water Day”. The General Assembly of the United Nations proclaimed the period 2005–2015 as the International Decade for action on “Water for life”.Wastewater is the water that has been adversely affected in quality by the waste materials. Waste materials are released from industries, households, and agriculture. Sewage is wastewater having dissolved and suspended imp purities released from homes, industries, hospitals, offices, and other users. Please refer Wastewater Story
Class 7 Extra Questions for more information.