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    • Posted by Masti Ki Zindagi 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    • Wastewater Treatment Plant:

     

    The process of wastewater treatment includes the following steps:

    1. Screening: This is the first step in which wastewater is passed through bar screens to remove large objects like rags, wood pieces, sticks, stones, etc.
    2. Grit and sand removal tanks: Water is then allowed to go into a grit and sand removal tank. This allows the grit, sand, stones and heavy objects to settle at the bottom.
    3. Sedimentation tanks: Water is now allowed to pass through large tanks called sedimentation tanks. These tanks are large enough so that organic solid matter like faeces sinks slowly to the bottom and materials like grease and oil float at the surface and skimmed off. The organic solid matter collected at the bottom of the sedimentation tank is called sludge which is continuously removed by scrapers. The sludge collected is sent to separate tanks called digesters where it is broken down by anaerobic bacteria and biogas is released.
    4. Aeration: The clarified water is passed into an aeration tank which contains aerobic bacteria. This bacteria rapidly grows and consume organic matter like human and animal wastes and convert it into carbon dioxide. The suspended microbes settle down at the bottom as activated sludge. Water is removed from the top and safely discharged into the rivers or lakes. Sometimes, before discharging into water bodies, water is disinfected with chlorine and ozone to reduce the number of harmful microorganisms that may cause various diseases.

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    • Posted by Minal 😁 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 3 answers

    Kajal Kumari 7 years, 1 month ago

    Pancreas

    1Thank You

    Amogh Raj 7 years, 1 month ago

    Pancreas

    1Thank You

    Devanshi Kothari 7 years, 1 month ago

    Pancreas

    2Thank You

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    • Posted by Ujawl Absti Be My Last Week In March 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Riya Pandey 7 years, 1 month ago

    There are two types of reproduction : Sexual and asexual. Vegetative propagation is a kind of asexual reproduction. In vegetative propagation vegetative parts of plants like , root, stem, buds are involved is called as vegetative propagation. In vegetative propagation only a single parent is involved. The offspring produced is the exact copy of the parent plant as it is produced from a single parent.

    3Thank You

    Minal 😁 7 years, 1 month ago

    There are two types of reproduction: sexual and asexual Vegetative propagation - Vegetative propagation is a form of asexual reproduction of a plant. Only one plant is involved and the offspring is the result of one parent. The new plant is genetically identical to the parent.

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    • Posted by Alankrita ? Patil 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Rajendra Nage 7 years, 1 month ago

    1. Ground water 2. Clouds 3. Infiltration 4. Water cycle

    3Thank You

    Khadija Agarbattiwala 7 years, 1 month ago

    1. Ground wtaer 2.clouds 3.infiltration 4.water cycle

    3Thank You

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    • Posted by Lipsa Sahoo 5 years, 11 months ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    The water found below the water table is called groundwater. A large amount of unseen water is hidden as groundwater. Many people in cities and villages use groundwater which they draw from wells, handpumps, tubewells, etc. The level of water under the ground is known as watertable. The water table varies from place to place and may change at a given place.

    Groundwater mainly comes from rainwater that seeps through the soil to reach the bedrock. Sometimes, water from lakes, rivers and ponds may also seep into the ground. The process of seeping of water into the ground is called infiltration. The seeped water collects between layers of hard rocks known as aquifers. Aquifers are like huge underground lakes filled with gravel and rocks from which water can be pumped out. Water in the aquifers can be usually pumped out with the help of tube wells or handpumps.

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    • Posted by Ishrat Belal 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 3 answers

    Devanshi Kothari 7 years, 1 month ago

    The carnivores won't be able to survive as they eat other animals.... And the balance of nature will also be disturbed

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    Riya Pandey 7 years, 1 month ago

    If all the herbivores in the forest die then all the carnivores living in the forest will die because of starvation and the food chain and the balance of carnivores and herbivores will get disturbed.

    1Thank You

    Deeksha Gupta 7 years, 1 month ago

    The carnivores will going to be die due abcense of food. Our lifelin chain will get disturb

    1Thank You

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    • Posted by Sneha Dua 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Lionel Messi⚽⚽???? 7 years, 1 month ago

    mercury is the only metal which remains liquid in room temperature

    1Thank You

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    • Posted by Manisha Choudhary 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    Algal bloom is the rapid increase of algae population in aquatic ecosystems, both in fresh and marine waters where it is known as either water bloom or marine bloom respectively. Algal bloom is mostly caused by the presence of large amounts of nitrogen and phosphorus present in water. These nutrients are washed away from lands and farms that are heavily riddled with nitrogenous and phosphatic fertilizers.

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    • Posted by Aadarsh Mishra 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Rajendra Nage 7 years, 1 month ago

    The two plant reprod8reproduce by asexual reproduction are rose and potato

    1Thank You

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    • Posted by Sanika Shetty Ks 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Riya Pandey 7 years, 1 month ago

    Magnesium ribbon burns with a brilliant white light. When it is completely burnt , it leaves behind a powdery ash. The reaction is as follows :Magnesium (mg) + oxygen (o2) =Magnesium oxide (Mgo)

    2Thank You

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    • Posted by Arpita Bhattacharjee 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Deeksha Gupta 7 years, 1 month ago

    The upper most layer of the forest canopy intercepted the flows of raindrops and most of the water was coming down throughthe branches and the stems of the trees .From the leaves it was dripping and herbs ,this way forest also act as a natural absorbed of rainwater and allows it to sleep . It helps maintain the water table throught the year forests not only in controlling flood

    1Thank You

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    • Posted by Anmol Anmol 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Insects do not have lungs or any pulmonary system like most vertebrates. Instead, they have a series of holes along the sides of their thorax (middle section) that branch off into many smaller and smaller tunnels, much like veins branch off into capillaries to carry oxygenated blood all over the body. These holes are called spiracles.

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    • Posted by Roshan Kunwar 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Himanshu Kothari 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Yogita Ingle 7 years, 1 month ago

    Storms are severe atmospheric disturbances accompanied by very strong, high-speed winds. Thunderstorms are whether conditions characterised by thunder, lightning and heavy rain. They occur due to the convection of air in hot and humid tropical areas. As the air near the earth's surface warms up, it rises. This results in strong upward rising winds which carry moisture with them. The moisture condenses into water droplets in the cooler, upper regions of the atmosphere. The water droplets fall down as rain or freeze and fall as hail. The rising air and the rapidly falling water droplets and ice crystals collide with each other and produce static electric charges. As a result the clouds get charged. When electric discharge occurs between the clouds or between a cloud and the ground, lightning occurs. The lightning heats up the air in its path very quickly and this results in a loud sound which we hear as thunder. 
     

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    • Posted by Sh ~?Shrawni 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 3 answers

    Sh ~?Shrawni 7 years, 1 month ago

    Gaurav

    1Thank You

    Sh ~?Shrawni 7 years, 1 month ago

    Thanks gurav

    1Thank You

    Gaurav Seth 7 years, 1 month ago

    Aerobic respiration Anaerobic respiration
    (i) Aerobic respiration takes place in the presence of oxygen.

    (ii) Complete breakdown of food occurs in aerobic respiration.

    (iii) The end products in aerobic respiration are carbon dioxide and water.

    (iv) Aerobic respiration produces a considerable amount of energy.

    Example: Human Beings.    		 (i) Anaerobic respiration takes place in the absence of oxygen.

    (ii) Partial breakdown of food occurs in anaerobic respiration.

    (iii) The end products in anaerobic respiration are ethanol and carbon dioxide (in yeast) and lactic acid (in animal muscles).

    (iv) Much less energy is produced in anaerobic respiration.

    Example: Yeast.
    <hr />

    Some similarity between the two is that ; 

    1. Both uses ATP along the process. 

    2. Both Occurs in the cell 

    3. Both have glucose as the starting substrate 

    4. Both will undergo gycolysis

    2Thank You

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    • Posted by P V 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Suvendu Nayak 7 years, 1 month ago

    Branches of the tall tree looking like a roof over other plant in forest

    1Thank You

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    • Posted by Titiksha Taprawat 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Siddha B 7 years, 1 month ago

    The system of organs and structures in which gas exchange takes place, consisting of the lungs and airways in air-breathing vertebrates, gills in fish and many invertebrates, the outer covering of the body in worms, and specialized air ducts in insects.

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    • Posted by Venktesh Venktesh 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Damini Goud 7 years, 1 month ago

    Soil is a mixture of humus and rock particle

    0Thank You

    Gunjan Toshniwal 7 years, 1 month ago

    Soil is the uppermost layer of the earth's crust. A soil profile is a cross section through the soil , whoch reveals its different layers.

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    • Posted by Goldee Purohit 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 5 answers

    Riya Pandey 7 years, 1 month ago

    Human body consists of 70% of water

    1Thank You

    Rajendra Nage 7 years, 1 month ago

    70%

    0Thank You

    Bhumika Sharma 7 years, 1 month ago

    Its 70%

    0Thank You

    Harshit Sharma 7 years, 1 month ago

    70%

    0Thank You

    Gunjan Toshniwal 7 years, 1 month ago

    70 pecent

    0Thank You

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    • Posted by Prem Kumar 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Meghna Thapar 6 years, 1 month ago

    Phenolphthalein is colourless in an acidic solution and gives a pink colour in a basic solution.

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    • Posted by Neeraj Kumar 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Rashmi Singha 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 0 answers
    ANSWER

    • Posted by Chottu Amrat 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Pari Sarraf 7 years, 1 month ago

    Cutting down of trees on a large scale is called deforestation

    0Thank You

    Yogita Ingle 7 years, 1 month ago

    Large scale cutting of trees to clear land for human use is called deforestation. Due to growing human population, vast tracts of forest have been removed. Deforestation comes in many forms, including forest fires, ranching and development, unsustainable logging for timber, clear-cutting for agriculture, and degradation due to climate change. Some 46 to 58 thousand square miles of forest are lost each year due to deforestation.

    3Thank You

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    • Posted by Chottu Amrat 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Keerthana..S.Krishna Krishna 7 years, 1 month ago

    Deforastation refers to the removal of forest cover

    0Thank You

    Yogita Ingle 7 years, 1 month ago

    Deforestation refers to the removal of forest cover where the land is thereafter converted to a non-forest use. The loss of the forest cover results change in the climatic condition and also affects the biodiversity which in turn threatens the life of the people. Deforestation comes in many forms, including forest fires, ranching and development, unsustainable logging for timber, clear-cutting for agriculture, and degradation due to climate change. Some 46 to 58 thousand square miles of forest are lost each year due to deforestation.

    1Thank You

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    • Posted by Meghna Meghna 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 4 answers

    Bhumika Sharma 7 years, 1 month ago

    Hey kriti giri concave and convex r mirrors and lenses ......not reflection ?

    0Thank You

    Safreen Banu ...?? 7 years, 1 month ago

    Regular and irregular reflection

    0Thank You

    Nishita Bansal 7 years, 1 month ago

    Specular and diffused reflection are two kinds of major reflection

    0Thank You

    M King Don 7 years, 1 month ago

    Convave and convex

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    • Posted by Monika Sri 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Monika Sri 7 years, 1 month ago

    S

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    • Posted by Sumedh Tribhuwan 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 3 answers

    Damini Goud 7 years, 1 month ago

    A current carrying coil of.an insulated wire wrapped around a piece of iron is known as electromagnet

    1Thank You

    Pari Sarraf 7 years, 1 month ago

    A coil wound around a soft iron core, when current flows through the coil it acts as a magnet. This soft iron is called electromagnet. It is present in electric bell ,solenoids etc

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    Niyati Niyati 7 years, 1 month ago

    A coil of current carrying wire wrapped around a piece of magnetic substance is called electromagnet . Electric bell, loudspeaker etc.

    1Thank You

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    • Posted by Dhanashri Vaidya 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 2 answers

    Safreen Banu ...?? 7 years, 1 month ago

    Regular and irregular reflection

    0Thank You

    Meghna Meghna 7 years, 1 month ago

    Diffuse reflection and specular reflection

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    • Posted by P Goutam 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Niyati Niyati 7 years, 1 month ago

    Zygote

    1Thank You

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    • Posted by Y.S. Poojitha 7 years, 1 month ago

    CBSE > Class 07 > Science
    • 1 answers

    Nishita Bansal 7 years, 1 month ago

    the process of too many plants growing on the surface of a river, lake, etc., often because chemicals that are used to help crops grow have been carried there by rain is eutrophication the equipment and systems that keep places clean, especially by removing human waste is sanitation

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