Write short answers
Q1.Why do we need food ?
Ans 1.We need food to
- Grow
- Get energy to work ,
- keep us fit and healthy
- and to stay alive.
Q2.Name any three food item which contains starch ?
Ans 2 .
- Bread
- Rice
- Potatoes
Q3. Name any four sources of vitamins and minerals?
Ans3.
- Fresh fruits
- vegetables
- milk
- fish
- liver
- meat
Q4. What is a balanced diet ?
Ans4. A balanced diet is a diet which contains right amount of nutrients like carbohydrates fats proteins vitamins and minerals.
Q5. Where does the digested food enter from the stomach?
Ans5. Small intestine.
Give answer in one word.
Q1.Body building nutrients
Ans:- Proteins.
Q2.Protective nutrients
Ans2:- Vitamins and Minerals.
Q4.Changing of food into a simpler form
Ans4:- Digestion
Q5.The digestive liquid in the mouth
Ans5:- Saliva .
Q6.The muscular bag in the digestive system
Ans6 :- Stomach
QMakes food last longer
:- preservation
What is the function of small intestine ?
The function of small intestine are as follows
Mixing of digestive juices
digestive juices are mixed in small intestine provided by the inner wall of small intestine, pancreas, liver.
Complete digestion of food
the food is completely digested in small intestine.
Absorption of digested food .
The blood vessels present on the wall of small intestine absorb the digested food and carry it to all the parts of the body .
What happens to the food in the mouth?
Process of digestion starts in the mouth .
Teeth bite and chew the food and break it into small pieces.
The digestive juice called saliva secreted by the salivary glands mixes with the food while chewing.
Saliva changes the insoluble starch in food into soluble sugar. Which makes the food easy to digest.
What happens to our food when it enters the stomach till it reaches the large intestine ?
The process of digestion of food from stomach to large intestine is as follows .
Stomach s
The stomach is a hollow muscular bag in which the food is churned.
digestive juices present in the stomach break down the proteins present in the food into a simpler form.
Small intestine
Mixing of digestive juices:- digestive juices are mixed in small intestine provided by the inner wall of small intestine, pancreas and liver.
Complete digestion of food:-
the food is completely digested in small intestine.
Absorption of digested food:- the blood vessel present on the Wall of small intestine absorb the digested food and carry it to all the parts of the body.
Large intestine
the undigested food passes into the large intestine.
Blood vessels in the Wall of large intestine absorbs the extra water.
Semi solid waste is passed out through the anus.
What is preservation of food ?
The process of treating food in a way that preserves its value for a long time is called preservation of food.
How do we preserve the food?
Food can be preserved in following ways
boiling
Canning
refrigeration
pickling
drying.
