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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Kartikey Ghoghar 5 years, 3 months ago

    More of the dust goes in

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    Parth Sindhwani 5 years, 3 months ago

    Because extra dust goes in

    1Thank You

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Ajay And Abhishek 5 years, 3 months ago

    Athlete breathe faster and deeper after finishing the race because show the oxygen supply is not sufficient and anaerobic respiration starts.

    1Thank You

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    Given,

    Amount of water = 200 mL

    Percolation time = 40min

    Rate of percolation = Amount of water in mL / Percolation time in min

                                     =200 / 40

                                     =5 mL/min.

    Hence, the rate of percolation of water through the given soil sample is 5 mL/min.

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    • A vertical section through different layers of the soil is called the soil profile. Each layer differs in feel (texture), colour, depth and chemical composition.
    • These layers are referred to as horizons.
    • The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water. It is called the topsoil or the A-horizon.
    • The next layer has a lesser amount of humus but more of minerals. This layer is generally harder and more compact and is called the B-horizon or the middle layer.
    • The third layer is the C-horizon, which is made up of small lumps of rocks with cracks and crevices. 

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 5 years, 3 months ago

    Soil pollution refers to the contamination of soil with anomalous concentrations of toxic substances.

    Example: Soil contamination that includes high levels of benzene raises the risk of leukaemia.

    Soil pollution can be controlled by the following measures:

    • By reducing the use of plastics, we can reduce soil pollution.
    • By controlling the use of chemical fertilisers and pesticides, we can control soil pollution.
    • Treating industrial waste before releasing.

    Soil erosion is the natural process in which the topsoil of a field is carried away by physical sources such as wind and water. Soil erosion can be controlled by the following measures:

    • Plant trees on barren lands to limit erosion of soil.
    • Add mulch and rocks to prevent the plants and grass underneath to prevent soil erosion.
    • Mulch matting can be used to reduce erosion on the slopes.
    • Put a series of fibre logs to prevent any water or soil from washing away.
    • A wall at the base of the slope can help in preventing the soil from eroding.
    • Every household should have a proper drainage system so that water flows down into proper water collecting systems.

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Nishma Insulkar 5 years, 3 months ago

    Because clay soil is good water absorbed

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    Mayra Singh 5 years, 3 months ago

    Because clay soil is a good absorber of water

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    Clayey soil has very small sized particles. These particles are packed tightly and therefore can retain water. Clayey soil is also rich in organic matter. For growing crops such as wheat, gram, and paddy, the soil should be good at retaining water and rich in organic matter is suitable. Therefore, clayey soils having these characteristics are useful for such kind of crops.

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Mayra Singh 5 years, 3 months ago

    Clayey soil

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    Avinash Kumar Mishra 5 years, 3 months ago

    Hii

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Aditya Nehe 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Sudhir Kumar Hati 5 years, 3 months ago

    Organisms need food because 1- to do some work 2-to repair the damage part of our body 3-to circulation of blood

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    Ahana Sharma Vii A 5 years, 3 months ago

    To take energy and organisms cannot live without food

    0Thank You

    Mayra Singh 5 years, 3 months ago

    Organism take in food for survive and to take nutrients,and for growth and for repair of mucles and bones in our body

    0Thank You

    Puneet Verma 5 years, 3 months ago

    Organisms need to take food to get energy and perform life processes. A living organism undergoes many life processes like nutrition, respiration, digestion, transportation, excretion, circulation of blood, and reproduction. To perform all these life processes the organism needs energy and nutrients.

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    The organisms need to take food to build their bodies, to grow, to repair damaged part of their bodies and to obtain the energy to carry out life processes. Food provide resistance to fight against diseases and protection from different infections.

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    • Posted by Sneha Prasad 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Smruti Dave 5 years, 3 months ago

    Hibernation is the activity in which animals go underground and stay there for a period of time. One such animal who do hibernation is polar bear.

    1Thank You

    Puneet Verma 5 years, 3 months ago

    Hibernation is a state of minimal activity and metabolic depression in endotherms. Hibernation is a seasonal heterothermy characterized by low body-temperature, slow breathing and heart-rate, and low metabolic rate. It most commonly occurs during winter months.

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    When animals hibernate, it means that they are going into a deep and prolonged sleep. Animals mostly do this in the winter times when the temperature outside is very cold and food is hard to find. Different animals follow different patterns of hibernation.

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Hibernation is a state of inactivity and metabolic depression in endotherms. Hibernation refers to a season of heterothermy characterized by low body temperature, slow breathing and heart rate, and low metabolic rate. It is most commonly observed during the winter months.

    1Thank You

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    • Posted by Shreyansh Sen 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 5 years, 1 month ago

    A starfish feeds by first extending its stomach out of its mouth and over the digestible parts of its prey, such as mussels and clams. The prey tissue is partially digested externally before the soup-like "chowder" produced is drawn back into its 10 digestive glands. Star fish feeds on aquatic animals covered by hard shells of calcium carbonate . After opening the shell , the star fish pops out its stomach through its mouth to eat the soft animal inside the shell . After eating the animal , the stomach goes back into the body and the food is slowly digested. 

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    • Posted by Sakshi Yadav 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Nivedya?? Manoj 5 years, 3 months ago

    Heat is a form of energy which gives us a sensation of warmth

    0Thank You

    Mannat Taneja 5 years, 3 months ago

    Heat is a form of energy which transfer from a body of higher temperature to lower temperature

    0Thank You

    Ronit Raj 5 years, 3 months ago

    Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

    0Thank You

    Sahadeva Pradhan 5 years, 3 months ago

    Heat energy is the result of the movement of tiny particles called atoms, molecules or ions in solids, liquids and gases. Heat energy can be transferred from one object to another. The transfer or flow due to the difference in temperature between the two objects is called heat.

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    • Posted by Samarthya Gupta 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Sahadeva Pradhan 5 years, 3 months ago

    Explaining Changes in Air Pressure with Altitude There are two reasons why air pressure decreases as altitude increases: density and depth of the atmosphere. ... With greater depth of the atmosphere, more air is pressing down from above. Therefore, air pressure is greatest at sea level and falls with increasing altitude.

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    • Posted by Mamta Kumar 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Shivam Tomar 5 years, 3 months ago

    Because it take nutrient from the host and it doesn't have chlorophyll

    1Thank You

    Ronit Raj 5 years, 3 months ago

    Cuscuta plant is called a parasite because it does not have chlorophyll and absorbs food material from the host. In this process, it deprives the host of its valuable nutrients.

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    Cuscuta plant is called a parasite because it does not have chlorophyll and absorbs food material from the host. In this process, it deprives the host of its valuable nutrients.

    2Thank You

    ANSWER

    • Posted by Anil Thakur 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Ronit Raj 5 years, 3 months ago

               View all Description Description The natural environment encompasses all living and non-living things occurring naturally, meaning in this case not artificial. The term is most often applied to the Earth or some parts of Earth. Wikipedia

    0Thank You

    Ronit Raj 5 years, 3 months ago

    The natural environment encompasses all living and non-living things occurring naturally, meaning in this case not artificial. The term is most often applied to the Earth or some parts of Earth.

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Everything that we see in our surroundings forms environment. It is our basic life support system. It provides us air, water, food and land—the basic needs of our life.

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 5 answers

    Shivam Tomar 5 years, 3 months ago

    Bridges,electrical aplinces,vehicles,are some example of human made enviroment

    0Thank You

    Saurav Das 5 years, 3 months ago

    School and hospital

    0Thank You

    Riddhima Chauhan 5 years, 3 months ago

    Park and Road

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    Parks, buildings, roads and industries are some examples of human-made environment. 

    2Thank You

    Sana Saeed 5 years, 3 months ago

    Park, road

    0Thank You

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 4 answers

    Himani Chauhan 5 years, 3 months ago

    All Water bodies are Hydrosphere

    0Thank You

    Mannat Taneja 5 years, 3 months ago

    The layer of water on earth

    1Thank You

    Yogita Ingle 5 years, 3 months ago

    The hydrosphere is the liquid water component of the Earth. It includes the oceans, seas, lakes, ponds, rivers and streams. The hydrosphere covers about 70% of the surface of the Earth and is the home for many plants and animals.

    1Thank You

    Suhani Kahandal 5 years, 3 months ago

    The domain of water is reffered to as hydrosphere ..

    1Thank You

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Mayra Singh 5 years, 3 months ago

    A blanket of air which srounds our earth is called atmosphere.and also we take in oxygen and give out carbon dioxide in atmosphere.?

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Atmosphere: The thick envelope of air surrounding the earth is called the atmosphere. It is one of the natural components of the environment. The survival of all the living beings on this planet depends on the atmosphere.

    0Thank You

    Suhani Kahandal 5 years, 3 months ago

    Atmosphere is the thin layer of air that surrounds the Earth ?..

    0Thank You

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Sudhir Kumar Hati 5 years, 3 months ago

    Lithosphere is the solid crust or hard top layer of the earth, it is made up of minerals and water

    0Thank You

    Ronit Raj 5 years, 3 months ago

    Lithosphere is the solid crust or hard top layer of the earth

    0Thank You

    Suhani Kahandal 5 years, 3 months ago

    Lithosphere is the solid crust or the hard top layer of the Earth ?..

    0Thank You

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    • Posted by Mukul Šharma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Sahadeva Pradhan 5 years, 3 months ago

    The reaction between baking soda and lemon juice can be given as below. (Citric acid)Lemon juice​+Baking soda⟶(Sodium hydrogen carbonate)CO2​(bubbles)​+(Carbon dioxide)Other substances​ Since a chemical reaction is taking place which can't be reversed,  it is a chemical change.

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a carbon dioxide gas. This is a chemical change.

    Lemon juice + Baking soda → Carbon dioxide + other substances

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Nazeeha Jamadar 5 years, 3 months ago

    The mode of nutrition in which plants prepare there own food by simple substances is now as autotrophic mode of nutrition

    1Thank You

    Sankara Narayanan S 5 years, 3 months ago

    The organisms which make their own food without depending others. Ex- Green plants

    2Thank You

    Shivam Singh 5 years, 3 months ago

    The plant that prepare their own food

    3Thank You

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    • Posted by Om Raut 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Mannat Taneja 5 years, 3 months ago

    What is the ,....... What?

    0Thank You

    Nazeeha Jamadar 5 years, 3 months ago

    ??? ?

    0Thank You

    Shivam Singh 5 years, 3 months ago

    What is the ..,.............

    1Thank You

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    • Posted by Satish Padmanabhuni 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Piyush Patel 5 years, 3 months ago

    CA(NO3)2

    1Thank You

    Nazeeha Jamadar 5 years, 3 months ago

    It is not having the formulas

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    • Posted by Khushi Keshri 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Sahadeva Pradhan 5 years, 3 months ago

    Steps: 1) Valency of oxygen is 2 . We know valency of one element is equally distributed to identical atoms. a) Na2O.: Valency of 2 Na,Sodium = Valency of O =>2 * Valency of Na, Sodium = 2 => Valency of Na= 1 b) Zinc Oxide (ZnO) : Valency of Zn, Zinc = Valency of O => Valency of Zn = 2 c) Lead Oxide (PbO) : Valency of Pb = Valency of O => Valency of Pb (Lead) = 2 d) Aluminium Oxide (Al2O3) : Valency of 2 Al = Valency of 3 O =>2 * Valency of Al = 3*2 => Valency of Al = 3 e) Calcium Oxide (CaO) : Valency of Ca = Valency of O => Valency of Ca = 2

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    • Posted by Shubham Singh 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Ujjawalsingh Singh 5 years, 3 months ago

    First, outline the thoracic cavity, neck, and head. Draw two rounded, somewhat triangular shapes in the thoracic cavity. These represent the lungs.Using lungs as a reference, draw an upside-down Y shape centered at the top quarter of the lungs and leading upward to the neck. This Y shape is the two bronchus trunks and the trachea. Continue the sketch of the trachea to the rest of the neck up to the mouth. Curving this structure through the mouth and to the lips will give you the shape of larynx. Draw oesophagus parallel to the larynx. Draw a flat kidney bean shape following the outline of the base of the lungs. Divide the right lung into 3 curved sections and the left lung into 2 curved sections. Extend the branching of the bronchus in each lung. Draw small grape-like structures attached to these bronchioles to represent the alveoli.

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    Yogita Ingle 5 years, 3 months ago

    How to draw the human respiratory system diagram?

    • First, outline the thoracic cavity, neck, and head.
    • Draw two rounded, somewhat triangular shapes in the thoracic cavity.
    • These represent the lungs.Using lungs as a reference, draw an upside-down Y shape centered at the top quarter of the lungs and leading upward to the neck. This Y shape is the two bronchus trunks and the trachea. 
    • Continue the sketch of the trachea to the rest of the neck up to the mouth. Curving this structure through the mouth and to the lips will give you the shape of larynx.
    • Draw oesophagus parallel to the larynx.
    • Draw a flat kidney bean shape following the outline of the base of the lungs. 
    • Divide the right lung into 3 curved sections and the left lung into 2 curved sections.
    • Extend the branching of the bronchus in each lung.
    • Draw small grape-like structures attached to these bronchioles to represent the alveoli. 

    1Thank You

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    • Posted by Anandita Kashyap 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Anjali Shejul 5 years, 3 months ago

    From which diagram, Anandita

    1Thank You

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    • Posted by Harshith .T.E 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 2 answers

    Sahadeva Pradhan 5 years, 3 months ago

    Utricularia Utricularia, commonly and collectively called the bladderworts, is a genus of carnivorous plants consisting of approximately 233 species (precise counts differ based on classification opinions; a 2001 publication lists 215 species).[1] They occur in fresh water and wet soil as terrestrial or aquatic species across every continent except Antarctica. Utricularia are cultivated for their flowers, which are often compared with those of snapdragons and orchids, especially amongst carnivorous plant enthusiasts. UtriculariaUtricularia vulgaris illustration from Jakob Sturm's "Deutschlands Flora in Abbildungen", Stuttgart (1796)Scientific classificationKingdom:PlantaeClade:TracheophytesClade:AngiospermsClade:EudicotsClade:AsteridsOrder:LamialesFamily:LentibulariaceaeGenus:Utricularia L.Subgenera Bivalvaria Polypompholyx Utricularia Diversity233 speciesBladderwort distribution All Utricularia are carnivorous and capture small organisms by means of bladder-like traps. Terrestrial species tend to have tiny traps that feed on minute prey such as protozoa and rotifers swimming in water-saturated soil. The traps can range in size from 0.2 mm to 1.2 cm.[2] Aquatic species, such as U. vulgaris (common bladderwort), possess bladders that are usually larger and can feed on more substantial prey such as water fleas (Daphnia), nematodes and even fish fry, mosquito larvae and young tadpoles. Despite their small size, the traps are extremely sophisticated. In the active traps of the aquatic species, prey brush against trigger hairs connected to the trapdoor. The bladder, when "set", is under negative pressure in relation to its environment so that when the trapdoor is mechanically triggered, the prey, along with the water surrounding it, is sucked into the bladder. Once the bladder is full of water, the door closes again, the whole process taking only ten to fifteen milliseconds.[3][4] Bladderworts are unusual and highly specialized plants, and the vegetative organs are not clearly separated into roots, leaves, and stems as in most other angiosperms.[5] The bladder traps, conversely, are recognized as one of the most sophisticated structures in the plant kingdom.[2]

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    Ansh Ahuja 5 years, 3 months ago

    Leguminus plant

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    • Posted by Sakshi Sinha 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 3 answers

    Anjali Shejul 5 years, 3 months ago

    Biological weathering is weathering caused by the plants and animals . Plants and animals release the acid forming chemicals that cause weathering and also contribute to the breaking down of rocks and landforms . Chemical weathering caused by breaking down of rocks and landforms.

    0Thank You

    Yogita Ingle 5 years, 3 months ago

    Biological weathering is also known as organic weathering. When the rock decomposes and decays due to the action of plants, animals and humans, it is known as biological weathering.
    Biological weathering involves both physical disintegration and decomposition. Many animals like rats and rabbits loosen the soil by making tunnels leading to the weathering of rocks. Human activities like mining, quarrying also results in physical disintegration of rocks.

    0Thank You

    Mayra Singh 5 years, 3 months ago

    Weathering of rocks formation due to micro organism eg-algae is called biological weathering

    1Thank You

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Sakshi Sinha 5 years, 3 months ago

    Flying kite When we pour cold water on a can filled with warm water it crushed

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    • Posted by Puneet Verma 5 years, 3 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Ayush Kumar Jha 5 years, 3 months ago

    No, a house which has no ventilators is not a safe or healthy house to live in . The air circulation is not there in such a house . So, it has no fresh air. Because warm air rises up and goes out through ventilators and fresh air comes in through windows

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