Understanding Blood Groups & Its Inheritance

Blood caries many chemicals, which have various functions. One group of chemicals is called antigens, which can stimulate the production of antibodies. Based on the presence or absence of blood antigens and antibodies, four groups A, B, AB and O are recognized in human body. Antigens are the proteins on the surface of red blood cells. Blood of one group contains antibodies in the plasma that reacts against the antigen on the cells of other groups.

Factors Affecting Climate Change

Climate is the average atmospheric condition of a particular place. It is different from weather because weather changes continuously but climate changes every 30 to 35 years. For example: If it rains continuously in a place every day, the climate there is monsoon. The pattern of weather of a place is known as the climate of a place.

Birth and Death Of Stars

A star is a self-luminous celestial body which converts nuclear energy into heat, light and other radiant energies. There are millions of stars in the universe. They are not uniformly distributed but are collected together in a group called galaxy. The Sun is also a star which is the member of the Milky Way Galaxy and it is the nearest star from the Earth.

Law of Conservation of Energy and Potential to Kinetic Energy Conversion

According to law of conservation of energy,

 Energy of an isolated system is constant. It can neither be created nor be destroyed but it can be transformed from one type to another.

 For example, when an object falls on the ground from a certain height, its kinetic energy is converted into other forms of energy such as sound energy, heat energy, light energy, etc.

Newton's Laws of Motion

Newton studied about motion scientifically and concluded some results which are called Newton's laws of motion. There are three laws of motion. All three laws define force in different ways. First law defines force qualitatively, second law defines quantitatively and third law highlights that single and isolated force is not possible.

Newton's First Law of Motion

According to Netwon's first law of motion,