Electricity

1:- What is Electricity?
Ans:- Electricity is the flow of electric charge. it is a form of energy that is generated by the flow of electron.

2:- Write some sources of electric  energy.
Ans:- Some sources of electric energy are power houses , electric generators , dry electric cells , storage cells and batteries.

3:-

Time and Motion

1:- What is Motion?
Ans:- An object is said to be in motion when it changes its position with respect to a fixed point with time.
2:- What is Rest?
Ans:- An object is said to be at rest if it remains stationary without any change in its position.

Reproduction in plants

1:- What is reproduction?

Ans:- Reproduction is the ability of living organisms to produce new organisms of their own kind. it helps the species from extinction.

movement of substances in plant and humanbody

1:- What is translocation of food in a plant?
Ans:- Movement of food from the leaves to the other organs of the plant where it is stored  or utilized is called translocation of food.

 

Respiration

1:- What is Respiration?
Ans:- Respiration is the biochemical process in which the cells of an organism obtain energy by combining oxygen and glucose, and as a resulting it release  carbon dioxide, water, and   energy in cells.

Soil

1:- What is Soil?
Ans:- Soil is the uppermost layer of the earth's surface. It is a powdery brown , black or golden yellow mixture of broken rock materials with moisture and humus. it supports life on earth.

 

How things change

1:- What is physical change?

Ans:- A change which can be reversed or gets reversed by itself is called Physical change. In physical change, no new substance is formed. Physical changes affect the form of a chemical substance, but not its chemical composition.
          Example:- tearing of paper , breaking of glass