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Posted by Mehal Singh 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Potential difference is the difference in electric potential energy between two points. It is the amount of work done in moving a unit positive charge from one point to another point in an electric field. This is measured in volt.
Posted by Saraswati Sharma 7 years, 2 months ago
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Meghna Thapar 5 years, 10 months ago
- Balancing the Chemical Equations:
- In a balanced chemical equation, the total number of atoms of each element of the reactants on the left hand side of the equation is equal to the number of atoms of the products formed on the right hand side of the equation.
- The total mass of the reactants is equal to the total mass of the products or the number of atoms of each element before the reaction and after the reaction is equal.
Posted by Nishika Jayamurthy 7 years, 2 months ago
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Posted by Varsha Reddy 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
It is a process in which the top fertile layer of soil is lost. Due to soil erosion, the soil becomes less fertile. The top layer of soil is very light which is easily carried away by wind and water. The removal of topsoil by the natural forces is known as soil erosion.
The various methods for preventing and reducing soil erosion are:
(i) Preventing excessive grazing.
(ii) Planting more and more trees as the roots of the trees hold the soil in place (afforestation).
(iii) Contour ploughing and terrace farming in hilly areas.
(iv) Keeping the vegetation cover on the ground to reduce the effect of wind and water.
Posted by Lalitha Sarvani 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
An adaptation is an evolutionary process of a living species to live in its habitat or habitats and capable to reproduce. As the environment is not a permanent existence, the organisms have to keep adapting to the changing environment.
We see a number of adaptations in animals as well. The giraffe that we see today as the tallest animal, wasn’t so tall many years ago. It was the competition with other herbivores for the bushes that lead to increasing the length of the neck in giraffes as they tried to reach for the leaves of taller trees.
Posted by Vinit Singh 7 years, 2 months ago
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Teena Jass 7 years, 2 months ago
Divakar Singh 7 years, 2 months ago
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Meghna Thapar 5 years, 10 months ago
- An element can be defined as a basic form of matter which cannot be broken down into simpler substances by any physical or chemical means.
Posted by Yash Goyal 7 years, 2 months ago
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Posted by Bhumika Sharma 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Red Blood Cells (Erythrocytes)
- Most abundant cells in the blood
- Account for approximately 40 to 45 percent of the blood.
- Biconcave disc which is round and flat, sort of like a shallow bowl.
- Disk diameter of approximately 6.2-8.2 µm.
- They have a thick rim and a thin sunken center.
- Nucleus Absent.
- Can change shape without breaking.
- Production of RBCs is controlled by erythropoietin.
White Blood Cells (Leukocytes)
- Account for only about 1% of the blood.
- 4500-11,000/mm3
- They are the cells that make up the majority of the immune system.
- It is the part of the body that protects itself against foreign substances and various types of infections.
- They are made in the bone marrow from multi-potent cells called hematopoietic stem cells.
- They exist in all parts of the body, including the connective tissue, lymph system, and the bloodstream.
- Leukopenia is a low white blood cell count that can be caused by damage to the bone marrow from things like medications, radiation, or chemotherapy.
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Bhumika Sharma 7 years, 2 months ago
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Aastha Patel 7 years, 2 months ago
Yogita Ingle 7 years, 2 months ago
ACID: Taste of acid is sour. There are many substances that contain acid and so taste sour. For example – lemon, curd, pickles, orange juice, vinegar, etc.
Substances that taste sour are called acidic. The chemical nature of such substance is known as ACIDIC.
The word acid comes from Latin ‘ACERE’ which means sour.
BASE: Taste of base is bitter. Substances that contain base taste bitter. For example; soap or soap solution, baking soda, washing soda, etc.
The chemical nature of substances that contain base is known as BASIC.
Posted by Aditya Chavan 7 years, 2 months ago
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Meghna Thapar 5 years, 10 months ago
- The prism splits the incident white light into a band of colours called spectrum.
- The angle between its two lateral faces is called the angle of the prism.
- The peculiar shape of the prism makes the emergent ray bend at an angle to the direction of the incident ray. This angle is called the angle of deviation.
- The band of seven colours formed on a white screen, when a beam of light is passed through a glass prism, is called spectrum of white light.
- The splitting up of white light into seven colours on passing through a transparent medium like a glass prism is called dispersion of light.
Posted by Aditya Chavan 7 years, 2 months ago
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Meghna Thapar 5 years, 10 months ago
Conservation means the process of keeping and protecting something from damage.
Posted by Rakhi Whadawan 7 years, 2 months ago
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Moli Dubey 7 years, 2 months ago
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Gaurav Singh 7 years, 2 months ago
1Thank You