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Humus - the organic constituent of soil, usually formed by the decomposition of plants and leaves. In most soil, the humus ranges from 2-10 percent, whereas it is up to 90 percent in peat bog.
The humus content is often determined after calculating the soil’s water content. The weighed dry soil sample is heated strongly so that the humus burns away. The loss of mass is the mass of humus that was burnt away.

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Who make rocket

Posted by Sarthak Jadhav 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Mind Boggler 7 years, 7 months ago

The first rockets we know about were used in China in the 1200s. These solid rockets were used for fireworks. Armies also used them in wars. In the next 700 years, people made bigger and better solid rockets. Many of these were used for wars too. In 1969, the United States launched the first men to land on the moon using a Saturn V rocket.

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Reproduction

Posted by Mansha Zahoor 7 years, 7 months ago

CBSE > Class 07 > Science

2 answers

Vaishnavi Poste 7 years, 7 months ago

The production of new individual from the parent is called a reproduction

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Samiksha Gudda 7 years, 7 months ago

The production of new individual from their parents is known as reproduction

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Why water kept in earthen pot are cooler

Posted by Arpita Sahoo 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

The water kept in an earthen pot (matka) becomes cool during summer because earthen pot has infinite pores in it from which some water peeps out and gets evaporated during summers. As evaporation leads to cooling water inside the pot remains cool. Glass and metal do not have any pores. So the water placed inside glass and metal vessels cannot seep out and evaporate. Therefore, the water inside remains hot.

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Why reproduction is necessary

Posted by Prathamesh Shinde 7 years, 7 months ago

CBSE > Class 07 > Science

2 answers

Vaishnavi Poste 7 years, 7 months ago

Reproduction ensurs that organism of a species continue to live even after the death of the parent organisms

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Yogita Ingle 7 years, 7 months ago

Reproduction is a fundamental feature of all living organisms. It is a biological process by which living organisms produce offspring’s similar to them. Reproduction ensures the continuity of various species on the Earth. In the absence of reproduction, the species will not be able to exist for a long time and may soon get extinct.

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In which form water is transported in a plant

Posted by Kuntluru Tharun Raj 7 years, 7 months ago

CBSE > Class 07 > Science

3 answers

Anshul Rathod 7 years, 7 months ago

Gas form with evaporation

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Vaishnavi Poste 7 years, 7 months ago

Liquid

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Chandrima Ray 7 years, 7 months ago

Liquid

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How many colours are present in sunlight

Posted by Kuntluru Tharun Raj 7 years, 7 months ago

CBSE > Class 07 > Science

4 answers

Anshul Rathod 7 years, 7 months ago

We are not seen but 7 colors are present

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Kuntluru Tharun Raj 7 years, 7 months ago

There is only one colour visible to us,but when the sunlight is passed through a spectrum 7 colours are formed namely voilet,indigo,blue,green,orange,yellow,red

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Vaishnavi Poste 7 years, 7 months ago

7 Colour:-violet, Indigo, blue ,green ,yellow ,orange and red.

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Chandrima Ray 7 years, 7 months ago

7 colours -violet, indigo, blue, green, yellow, orange, red.

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What is.magnified glasa

Posted by Saugata Mandal 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Nakshatra Saboo 7 years, 7 months ago

It is the object through which we can see small objects bigger

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Name those who has an abundance of food and is primary life sustaining part of a forest

Posted by Paras Gupta 7 years, 7 months ago

CBSE > Class 07 > Science

0 answers

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Mechanism of breathing done

Posted by Himanshi Yadav 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Subhadeep Banerjee Champ 7 years, 7 months ago

Lungs are the main respiratory organ of the body surrounded by air tight chest cavity. The muscular piece forms the diaphragm which separates the chest cavity from the abdominal cavity. During inhalation the lungs move up and out ward increasing the space , the air rushes inside the Lungs and during exaltation the space inside the Lungs decreases and the lungs inflate .

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Mechanism of breathing In science

Posted by Himanshi Yadav 7 years, 7 months ago

CBSE > Class 07 > Science

0 answers

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How is the process of neutralisation helpful in agriculture

Posted by Naresh Salecha 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Subhadeep Banerjee Champ 7 years, 7 months ago

Because it neutralises the affect of access acid or Base in the soil which helps in proper development of the plant

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How is the process of neutralisation helpful in agriculture?

Posted by Naresh Salecha 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Excessive use of fertilisers makes soil acidic. As a result, plants cannot grow properly, and the yield decreases. Adding a base like quick lime, (calcium oxide) or slaked lime (calcium hydroxide) neutralises the soil and makes it suitable for plants. Similarly, when soil is basic in nature, organic matter is added to release acid and make it neutral, and thus, suitable for plants.

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Example of convex mirror

Posted by Khushboo Verma 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Subhadeep Banerjee Champ 7 years, 7 months ago

rear view or side view mirrors which are used in automobiles is an example of convex mirror

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Chemical formula of carbonic acid

Posted by Sahil Sekhon 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Royal Girl 7 years, 7 months ago

H2CO3

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Q1)Explain how forest prevent floods

Posted by Shubham Kirar 7 years, 7 months ago

CBSE > Class 07 > Science

3 answers

Vaishnavi Poste 7 years, 7 months ago

Forest canopy do not allow rain water to directly fall on ground. Water drips slowly through branches and leaves. Please allow water to seep into the soil and reduced the flow of water and prevent floods.

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Royal Girl 7 years, 7 months ago

1. by intercepting the floors of raindrops. thus Checking the flow of rainwater on forest floor.2. Absorbing rainwater and allow it to seep into the soil.3. Roots of the trees bind the soil and prevent it from being washed away.☺

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Chandrima Ray 7 years, 7 months ago

They do so, as their roots hold the soil

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Explain how forests prevent floods

Posted by Shubham Kirar 7 years, 7 months ago

CBSE > Class 07 > Science

1 answers

Yogita Ingle 7 years, 7 months ago

Forest acts as a natural absorber of water. It allows rain water to seep through. In the absence of trees, the rain water would hit the ground directly resulting in flood. However, because of the presence of trees, rain water does not hit the ground directly. It rather hits the ground slowly. Hence, before flooding, all the rain water seeps through ground. In this way, forests prevent floods.

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How does reproduction takes place in animals

Posted by Rachit Shukla 7 years, 7 months ago

CBSE > Class 07 > Science

6 answers

Rachit Shukla 7 years, 7 months ago

But I want to study everything earlier as a scholar.

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Subhadeep Banerjee Champ 7 years, 7 months ago

There modeof reproduction in animal is sexual . It reproduces when the male and female reproductive organ unite to form a new individual.

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Shreya Jha 7 years, 7 months ago

You will read this in class 8

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Anshika Tiwari 7 years, 7 months ago

Out of courses

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Chandrima Ray 7 years, 7 months ago

Yes it is out of courses

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Rock Star 7 years, 7 months ago

Not in our course

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How does sewerage system carry sewage

Posted by Hira Jha 7 years, 7 months ago

CBSE > Class 07 > Science

0 answers

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Image formed by convex and concave lenses and mirror

Posted by Urvi Chadha 7 years, 7 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is difference between heat and temperature

Posted by Santosh Raut 7 years, 7 months ago

CBSE > Class 07 > Science

2 answers

Chandrima Ray 7 years, 7 months ago

Heat is a form of energy. temperature is the measure of hotness or coldness of a substance. heat is the cause of temperature .temperature is the effect of heat .

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Shreyasi Dawn 7 years, 7 months ago

Heat is a form of energy where is temperature is a hotness or coldness of an object

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Uses of convex lens and convex mirror

Posted by Bhupesh Shrotriya 7 years, 7 months ago

CBSE > Class 07 > Science