Components of food (Part-1)

Components of food (Part-1)

Q.1. What are Nutrients?

Ans. Nutrients are the compounds in foods (components of food) which are essential to life and health, providing us with energy, the building blocks for repair and growth and substances necessary to regulate chemical processes.

Our food carries five major nutrients: Carbohydrates, fats, proteins, vitamins and minerals. In addition to these nutrients, there are two other important components of food: water and roughage. Our body needs all these components to maintain good health. 


Q.2. What are carbohydrates?

Ans. Carbohydrates are the energy giving foods as they are main sources of energy for our body. The main carbohydrate that we eat in our food is starch and it comes from cereals like wheat and rice. 

There are two types of carbohydrates: simple and complex carbohydrates.

Simple carbohydrates are digested quickly and provide instant energy like table sugar while complex carbohydrates take longer time to digest like wheat.

Some of the sources of carbohydrates are: 



Q.3. How will you test the presence of starch in any food item?

Ans. 
Q.4. How can we prepare iodine solution for test of starch in our food?
Ans. 

Q.5. What are Fats?
Ans. 

Q.6. Draw some plant sources of Fats?
Ans. 

Q.7. Draw some animal sources of Fats?
Ans. 

Q.8. Eating too much of fat rich food is not good for health. Why?
Ans. 
Q.9. How will you test the presence of Fats in any food item?

Ans.


Popular posts from this blog

Friction (part-1)

Image
FRICTION Q.1. What is force? Write few of its characteristics. Ans.1.  A push or a pull on an object is called a force.                      Force is a vector quantity (having magnitude  as well as direction).           S.I. unit of Force is N (Newton).           Force can Change the State of Motion.                   Force can Change the Shape of an Object. s          Q.2. What is friction ?      Ans.2.  The force which opposes the motion of an object on the surface of another object is called force of friction. Force of friction is a contact force. The force of friction always opposes the applied force (direction of motion).  
Read more

Friction (part-2)

Image
FRICTION Q.3.  Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it. Ans.3.                                 Q.4. What is the cause of friction? Ans.4.  Friction occurs due to the interlocking of irregularities between two surfaces in motion to each other. Every object has some sort of irregularities in its surface, so when two surfaces come in contact with each other and one object moves over the another, so their irregularities get interlocked and moving object starts losing its energy in breaking the interlocking and finally it comes to rest.                                             Q.5. What are the factors on which friction depends? Ans.5.  There are two factors affecting friction: 1.      Nature of the surfaces: Friction increases with roughness and decreases with smoothness of the surfaces. On rough surfaces, there are a larger number of irregularities than the s
Read more
PRACTICE WORKSHEET (CLASS - VIII) TOPIC – FORCE AND PRESSURE 1. When a force acts on a moving object, it can make the object a) move faster b) slow down c) stop d) all of these 2. Name the type of forces involved in the following :  a) A horse pulling a cart _________________________  b) A moving boat coming to rest when rowing is stopped ___________________ c) A coin falling to the ground on slipping from hand ______________________  d) A sticker attached to steel almirah without glue _________________________ 3. Two students fought over a lunch box, both started pulling it from opposite ends but the box didn't move from its place. What will you infer about the magnitude and direction of the forces? 4. An archer shoots an arrow in the air horizontally. However, after moving some distance, the arrow falls to the ground. Name the initial force that sets the arrow in motion. Explain why the arrow ultimately falls down. Assertion / Reason :  For question numbers 5, two sta
Read more