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NCERT Solutions for Class 7 Science

NCERT Solutions For CBSE Class 7 science

Hi students, welcome to Amans Maths Blogs (AMB). Do you want to get the NCERT solutions for class 7 Science. As we know that NCERT text books are prescribed by the CBSE. It means you have to study the NCERT text books of class 7 for the CBSE school’s exams. If you find that a question is very difficult to solve and you have no idea how to solve these questions, then you are at right place. 

This NCERT solutions for class 7 Science will also help you when you are doing your homework or any type of school assignment work. All these solutions are of NCERT text books exercise questions and solved by science faculty. I am a Maths Faculty and founder of this Amans Maths Blogs (AMB). I am just sharing the NCERT solutions for class 7 Science, which is chapter wise solutions of class 7 NCERT text book.

NCERT Solutions for Class 7 Science Chapters

NCERT Solutions for Class 7 Science Chapter 1: Nutrition in Plants

The summery of the chapter are as below.

1. All organisms take food and utilise it to get energy for the growth and maintenance of their bodies.
2. Green plants synthesise their food themselves by the process of photosynthesis. They are autotrophs.
3. Plants use simple chemical substances like carbon dioxide, water and minerals for the synthesis of food.
4. Chlorophyll and sunlight are the essential requirements for photosynthesis.
5. Complex chemical substances such as carbohydrates are the products of photosynthesis.
6. Solar energy is stored in the form of food in the leaves with the help of chlorophyll.
7. Oxygen is produced during photosynthesis.
8. Oxygen released in photosynthesis is utilised by living organisms for their survival.
9. Fungi derive nutrition from dead, decaying matter. They are saprotrophs. Plants like Cuscuta are parasites. They take food from the host plant.
10. A few plants and all animals are dependent on others for their nutrition and are called heterotrophs.
Click Here To Get Solution of NCERT Solutions for Class 7 Science Chapter 1

NCERT Solutions for Class 6 Science Chapter 2: Nutrition in Animals

The summery of the chapter are as below.

1. Animal nutrition includes nutrient requirement, mode of intake of food and its utilization in the body.
2. The modes of feeding vary in different organisms.
3. The absorbed substances are transported to different parts of the body. Water and some salts are absorbed from the undigested food in the large intestine.
4. The undigested and unabsorbed residues are expelled out of the body as faeces through the anus.
5. The grazing animals like cows, buffaloes and deer are known as ruminants. They quickly ingest, swallow their leafy food and store it in the rumen. Later, the food returns to the mouth and the animal chews it peacefully.
6. Amoeba ingests its food with the help of its false feet or pseudopodia. The food is digested in the food vacuole
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NCERT Solutions for Class 7 Science Chapter 3: Fibre To Fabric

The summery of the chapter are as below.

1. Silk comes from silkworms and wool is obtained from sheep, goat and yak. Hence silk and wool are animal fibres.
2. The hairs of camel, llama and alpaca are also processed to yield wool.
3. In India, mostly sheep are reared for getting wool.
4. Sheep hair is sheared off from the body, scoured, sorted, dried, dyed, spun and woven to yield wool.
5. Silkworms are caterpillars of silk moth.
6. During their life cycle, the worms spin cocoons of silk fibres.
7. Silk fibres are made of a protein.
8. Silk fibres from cocoons are separated out and reeled into silk threads.
9. Weavers weave silk threads into silk cloth.
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NCERT Solutions for Class 7 Science Chapter 4: Heat

The summery of the chapter are as below.

1. Our sense of touch is not always a reliable guide to the degree of hotness of an object.
2. Temperature is a measure of the degree of hotness of an object.
3. Thermometer is a device used for measuring temperatures.
4. Clinical thermometer is used to measure our body temperature. The range of this thermometer is from 35°C to 42°C. For other purposes, we use the laboratory thermometers. The range of these thermometers is usually from –10°C to 110°C..
5. The normal temperature of the human body is 37°C.
6. The heat flows from a body at a higher temperature to a body at a lower temperature. There are three ways in which heat can flow from one object to another. These are conduction, convection and radiation.
7. In solids, generally, the heat is transferred by conduction. In liquids and gases the heat is transferred by convection. No medium is required for transfer of heat by radiation.
8. The materials which allow heat to pass through them easily are conductors of heat.
9. The materials which do not allow heat to pass through them easily are called insulators.
10. Dark-coloured objects absorb radiation better than the light-coloured objects. That is the reason we feel more comfortable in light-coloured clothes in the summer.
11. Woollen clothes keep us warm during winter. It is so because wool is a poor conductor of heat and it has air trapped in between the fibres.
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NCERT Solutions for Class 7 Science Chapter 5: Acids, Bases & Salts

The summery of the chapter are as below.

1. Acids are sour in taste. Bases are bitter in taste and soapy to touch.
2. Acid turns blue litmus red. Bases turn red litmus blue.
3. Substances which are neither acidic nor basic are called neutral.
4. Solutions of substances that show different colour in acidic, basic and neutral solutions are called indicators.
5. An acid and a base neutralise each other and form a salt. A salt may be acidic, basic or neutral in nature.
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NCERT Solutions for Class 7 Science Chapter 6: Physical & Chemical Changes

The summery of the chapter are as below.

1. Changes can be of two types, physical and chemical.
2. Physical changes are changes in the physical properties of substances. No new substances are formed in these changes. These changes may be reversible.
3. In chemical changes new substances are produced.
4. Some substances can be obtained in pure state from their solutions by crystallization.
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NCERT Solutions for Class 7 Science Chapter 7: Weather, Climate & Adaptations of Animals to Climate

The summery of the chapter are as below.

1. 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.
2. The weather is generally not the same on any two days and week after week..
3. The maximum temperature of the day occurs generally in the afternoon while the minimum temperature occurs in the early morning.
4. The times of sunrise and sunset also change during the year.
5. All the changes in the weather are driven by the sun.
6. The average weather pattern taken over a long time, say 25 years, is called the climate of the place.
7. The tropical and the polar regions are the two regions of the earth, which have severe climatic conditions.
8. Animals are adapted to the conditions in which they live.
9. The polar regions are very cold throughout the year. The sun does not set for six months in a year and in the other six months it does not rise.
10. Migration is another means to escape the harsh, cold conditions.
11. Animals in the tropical rain-forests are adapted such that they eat different kinds of food to overcome the competition for food and shelter.
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NCERT Solutions for Class 7 Science Chapter 8: Winds Storm & Cyclone

The summery of the chapter are as below.

1. Air around us exerts pressure.
2. Air expands on heating and contracts on cooling.
3. Warm air rises up, whereas comparatively cooler air tends to sink towards the earth’s surface.
4. As warm air rises, air pressure at that place is reduced and the cooler air moves to that place.
5. The moving air is called wind.
6. Uneven heating on the earth is the main cause of wind movements.
7. Winds carrying water vapour bring rain.
8. High-speed winds and air pressure difference can cause cyclones.
9. It has become easier to monitor cyclones with the help of advance technology like satellites and radars.
10. Self-help is the best help. Therefore it is better to plan in advance and be ready with defense against any approaching cyclone.
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NCERT Solutions for Class 7 Science Chapter 9: Soil

The summery of the chapter are as below.

1. Soil is important for life on the earth.
2. Soil profile is a section through different layers of the soil, Various layers are called horizons.
3. Soil is of different types: clayey, loamy and sandy.
4. Percolation rate of water is different in different types of soil. It is highest in the sandy soil and least in the clayey soil.
5. Different types of soils are used to cultivate different types of crops. Clay and loam are suitable for growing wheat, gram and paddy. Cotton is grown in sandy loam soil.
6. Soil holds water in it, which is called soil moisture. The capacity of a soil to hold water is important for various crops.
7. Clayey soil is used to make pots, toys and statues.
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NCERT Solutions for Class 7 Science Chapter 10: Respiration in Organism

The summery of the chapter are as below.

1. Respiration is essential for survival of living organisms. It releases energy from the food.
2. The oxygen we inhale is used to breakdown glucose into carbon dioxide and water. Energy is released in the process.
3. The breakdown of glucose occurs in the cells of an organism (cellular respiration).
4. If the food is broken down with the use of oxygen, it is called aerobic respiration. If the breakdown occurs without the use of oxygen, the respiration is called anaerobic respiration.
5. During heavy exercise when the supply of oxygen to our muscle cells is insufficient, food breakdown is by anaerobic respiration.
6. Increased physical activity enhances the rate of breathing.
7. In animals like cow, buffalo, dog and cat the respiratory organs and the process of breathing are similar to those in humans..
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NCERT Solutions for Class 7 Science Chapter 11: Transportation in Animals & Plants

The summery of the chapter are as below.

1. In most animals the blood that circulates in the body distributes food and oxygen to different cells of the body. It also carries waste products to different parts of the body for excretion.
2. Circulatory system consists of the heart and blood vessels.
3. In humans, blood flows through arteries and veins and the heart acts as a pumping organ.
4. Blood consists of plasma, RBC, WBC and platelets. Blood is red due to the presence of a red pigment, haemoglobin.
5. The human heart beats about 70ñ80 times per minute in an adult person. This is called heart rate.
6. Arteries carry blood from the heart to all parts of the body.
7. Veins carry blood from all parts of the body back to the heart.
8. Fish excrete waste substances such as ammonia which directly dissolve in water.
9. Salts and urea are removed along with water as sweat.
10. Removal of waste products from the body is called excretion.
11. Excretory system of humans consists of two kidneys, two ureters, a urinary bladder, and urethra.
12. Birds, insects and lizard excrete uric acid in semi-solid form.
13. Water and mineral nutrients are absorbed by roots from the soil.
14. Nutrients are transported along with water to the entire plant via the vascular tissue called xylem.
15. The vascular tissue for the transport of food to the various parts of the plant is phloem.
16. A lot of water is lost by plants in the form of vapour through stomata during transpiration.
17. Transpiration generates a force which pulls up water absorbed by the roots from the soil, to reach the stem and leaves.
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NCERT Solutions for Class 7 Science Chapter 12: Reproduction in Plants

The summery of the chapter are as below.

1. All organisms multiply or reproduce their own kind.
2. In plants there are two modes of reproduction, asexual and sexual.
3. There are several methods of asexual reproduction such as fragmentation, budding, spore formation and vegetative propagation.
4. Sexual reproduction involves the fusion of male and female gametes.
5. In vegetative propagation new plants are produced from different vegetative parts such as leaves, stems and roots.
6. Flower is the reproductive part of a plant.
7. A flower may be unisexual with either the male or the female reproductive parts.
8. The male gametes are found inside the pollen grains and female gametes are found in the ovule
9. Pollination is the process of transfer of pollen grains from the anther of one flower to the stigma of the same or another flower
10. Pollination takes place in plants with the help of wind, water and insects
11. The fusion of male and female gametes is called fertilization.
12. Fertilized egg is called zygote. Zygote develops into an embryo.
13. Fruit is the mature ovary whereas ovule develops into a seed, which contains the developing embryo
14. Seed dispersal is aided by wind, water and animals
15. Seed dispersal helps the plants to (i) prevent overcrowding, (ii) avoid competition for sunlight, water and minerals and (iii) invade new habitats
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NCERT Solutions for Class 7 Science Chapter 13: Motion & Time

The summery of the chapter are as below.

1. The distance moved by an object in a unit time is called its speed.
2. Speed of objects help us to decide which one is moving faster than the other.
3. The speed of an object is the distance travelled divided by the time taken to cover that distance. Its basic unit is metre per second (m/s).
4. Periodic events are used for the measurement of time. Periodic motion of a pendulum has been used to make clocks and watches
5. Motion of objects can be presented in pictorial form by their distance-time graphs.
6. The distance-time graph for the motion of an object moving with a constant speed is a straight line.
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NCERT Solutions for Class 7 Science Chapter 14: Electric Current & Its Effect

The summery of the chapter are as below.

1. It is convenient to represent electric components by symbols. Using these, an electric circuit can be represented by a circuit diagram
2. When an electric current flows through a wire, the wire gets heated. It is the heating effect of current. This effect has many applications
3. Wires made from some special materials melt quickly and break when large electric currents are passed through them. These materials are used for making electric fuses which prevent fires and damage to electric appliances
4. When an electric current flows through a wire, it behaves like a magnet.
5. A current carrying coil of an insulated wire wrapped around a piece of iron is called an electromagnet
6. Electromagnets are used in many devices.
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NCERT Solutions for Class 7 Science Chapter 15: Light

The summery of the chapter are as below.

1. Light travels along straight lines.
2. Any polished or a shining surface acts as a mirror.
3. An image which can be obtained on a screen is called a real image.
4. An image which cannot be obtained on a screen is called a virtual image.
5. The image formed by a plane mirror is erect. It is virtual and is of the same size as the object. The image is at the same distance behind the mirror as the object is in front of it.
6. In an image formed by a mirror, the left side of the object is seen on the right side in the image, and right side of the object appears to be on the left side in the image.
7. A concave mirror can form a real and inverted image. When the object is placed very close to the mirror, the image formed is virtual, erect and magnified.
8. Image formed by a convex mirror is erect, virtual and smaller in size than the object.
9. A convex lens can form real and inverted image. When the object is placed very close to the lens, the image formed is virtual, erect and magnified. When used to see objects magnified, the convex lens is called a magnifying glass.
10. A concave lens always forms erect, virtual and smaller image than the object.
11. White light is composed of seven colours.
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NCERT Solutions for Class 7 Science Chapter 16: Water

The summery of the chapter are as below.

1. Water is essential for all living beings. There can be no life without it.
2. Water exists in three forms: solid, liquid and vapour.
3. Though water is maintained by the water cycle, yet there is an acute scarcity of water in many parts of the globe.
4. There is an uneven distribution of water. Much of it has resulted from human activities.
5. Rapid growth of industries, increasing population, growing irrigation requirements and mismanagement are some of the causes for water shortage.
6. We need to be worried about the wastage during the supply of water through pipes, the leaking taps in buildings and other places. Unnecessary use of water and overdrawing from groundwater should be
avoided. Recharge of water to the ground should be increased
7. The need of the hour is that every individual uses water economically.
8. Plants wilt and ultimately dry-up if they are not watered for a few days.
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NCERT Solutions for Class 7 Science Chapter 17: Forests: Our Lifeline

The summery of the chapter are as below.

1. We get various products from the forests surrounding us.
2. Forest is a system comprising various plants, animals and micro-organisms.
3. In a forest, trees form the uppermost layer, followed by shrubs. The herbs form the lowest layer of vegetation.
4. Different layers of vegetation provide food and shelter for animals, birds and insects.
5. The various components of the forest are interdependent on one another.
6. The forest keeps on growing and changing, and can regenerate.
7. In the forest, there is interaction between soil, water, air and living organisms.
8. Forests protect the soil from erosion.
9. Soil helps forests to grow and regenerate.
10. Forests are the lifeline for the forest-dwelling communities.
11. Forests influence climate, water cycle and air quality.
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NCERT Solutions for Class 7 Science Chapter 18: Waste Water Story

The summery of the chapter are as below.

1. Used water is wastewater. Wastewater could be reused.
2. Wastewater is generated in homes, industries, agricultural fields and in other human activities. This is called sewage.
3. Sewage is a liquid waste which causes water and soil pollution.
4. Wastewater is treated in a sewage treatment plant.
5. Treatment plants reduce pollutants in wastewater to a level where nature can take care of it.
6. Where underground sewerage systems and refuse disposal systems are not available, the low cost on-site sanitation system can be adopted.
7. By-products of wastewater treatment are sludge and biogas.
8. Open drain system is a breeding place for flies, mosquitoes and organisms which cause diseases.
9. We should not defecate in the open. It is possible to have safe disposal of excreta by low cost methods.
Click Here To Get Solution of NCERT Solutions for Class 7 Science Chapter 18

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