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Heart is a muscular organ; which is composed of cardiac muscles. It is so small that it can fit inside an adult's fist. The heart is a pumping organ which pumps the blood. The human heart is composed of four chambers, viz. right auricle, right ventricle, left auricle and left ventricle. Go to Lesson

NCERT solutions

In each ovulation cycle, an egg is released from the ovary which is transferred to the fallopian tube. Additionally, the uterus prepares itself for a possible pregnancy. The lining of uterus thickens. When no conception happens, the lining of the uterus is shed in fragments; along with the unfertilized egg. These things are released out through the vagina in the form of bleeding; called menstruation. Go to Lesson

MCQ Quiz

We have designed quizzes which are simple and fun to play with. Each quiz has 10 to 20 questions with four options. After clicking on a particular option, you will get instant feedback if your anwer is right or wrong. Once you finish a quiz, you get your overall score. Attempt a Quiz

The Idea of Satyagraha

Mahatma Gandhi returned to India in January 1915. Gandhiji had come from South Africa where he had successfully fought the racist regime with a novel method of mass agitation, which he called satyagraha. The idea of satyagraha emphasised the power of truth and the need to search for truth. It suggested that if the cause was true, if the struggle was against injustice, then physical force was not necessary to fight the oppressor. Without seeking vengeance or being aggressive, a satyagrahi could win the battle through nonviolence. This could be done by appealing to the conscience of the oppressor. People; including the oppressors; had to be persuaded to see the truth, instead of being forced to accept truth through the use of violence. By this struggle, truth was bound to ultimately triumph. Mahatma Gandhi believed that this dharma of non-violence could unite all Indians. Go to Lesson

Types of Chemical Reaction

Chemical reactions can be classified in following types:

  • Combination Reactions
  • Decomposition Reactions
  • Displacement Reactions
  • Double Displacement Reactions
  • Oxidation and Reduction ReactionsGo to main chapter

Nutrition and Nutrients

The process by which an organism takes food and utilizes it is called nutrition.

Need of nutrition: Organisms need energy to perform various activities. The energy is supplied by the nutrients. Organisms need various raw materials for growth and repair. These raw materials are provided by nutrients.

Nutrients: Materials which provide nutrition to organisms are called nutrients. Carbohydrates, proteins and fats are the main nutrients and are called macronutrients. Minerals and vitamins are required in small amounts and hence are called micronutrients.Click for More

The Rhime of Ancient Mariner

This poem is about the tale of an ancient mariner. The mariner is sharing his experience of a long voyage. The poem starts with the funny incident of the old sailor getting hold of young men so that he could get a receptive audience for his tale.Click for More

Formation of India

The Indian Peninsula drifted towards the north and finally collided with the much larger Eurasian Plate. As a result of this collision, the sedimentary rocks which were accumulated in the geosynclines (known as Tethys) got folded and formed the mountain systems of the West Asia and Himalaya. Click for More

King and Monkey

A king had a pet monkey. One day the king was sleeping and the monkey was fanning by his side. The monkey saw a fly sitting on the king's chest. Monkey tried to shoo the fly away. The fly would return again and again to disturb the sleep. The monkey got a sword and tried to kill the fly. In one stroke of sword the king was killed instead. Never keep a foolish as your assistant. Panchatantra Stories

French Revolution

The French Revolution is a watershed development in the modern history. French Revolution not only had a long lasting impact on the French society but also on the whole world. The modern ideas of popular democracy had its roots in France. Similarly, the idea of nation states; as we know them; began with French Revolution. The national movements in various colonies; including India, Indo-China and South Africa were greatly influenced by the developments in French Revolution. Go to Lesson


Myopia is also known as near-sightedness. A person with myopia can see nearby objects clearly but cannot see distant objects distinctly. In a myopic eye, the image of a distant object is formed in front of the retina and not at the retina itself. This defect may arise due to; excessive curvature of the eye lens, or elongation of the eyeball. This defect can be corrected by using a concave lens of suitable power. A concave lens of suitable power will bring the image back on to the retina and thus the defect is corrected.Go to Lesson

Carbon: An Introduction

Atomic Number: 6

Electronic Configuration: 2, 4

Valence electrons: 4

Property: Non-metal

Previously, carbon compounds could only be obtained from a living source; hence they are also known as organic compounds. Go to Lesson


Hypermetropia is also known as far-sightedness. A person with hypermetropia can see distant objects clearly but cannot see nearby objects distinctly. The near point, for the person, is farther away from the normal near point (25 cm). Such a person has to keep a reading material much beyond 25 cm from the eye for comfortable reading. This is because the light rays from a nearby object are focused at a point behind the retina. This defect arises either because Go to Lesson

Rise of Nationalism in Europe

It is a belief system which instills a sense of common identity among the members of a nation. National flag, national symbol, national anthem, etc. play an important role in developing and strengthening the idea of nationalism. Go to Lesson