Sanitation of food and water

-

 Answer the following questions :


1. What is sanitation?

Ans : Sanitation refers to public health condition related to clean drinking water and adequate treatment and disposal of human excreta and sewage 

2. Why should drinking water be purified?

Ans: Water may contains germs which make us sick . This water may cause of many diseases like typhoid, cholera, jaundice etc .

Therefore it is necessary to purify the drinking water .

3. What is canning?

Ans: Canning is a method of food preservation by which food can be preserved in air tight containers where moisture and air can not enter into it .They also keep away insects, rodents etc from preserved food. 

4. What are drying and dehydrating methods?

Ans: Drying and dehydration are food preservative systems . Where the food can be preserved for many days as the water content is removed from the food completely . Peas , pulses etc are preserved by this method .

5. What do you mean by sweetening?

Ans: Sweetening is also a method of food preservation . 

Fruits lile mango, apple, ete are preserved in strong sugar solution . This solution drains out bacterial cells and kills them .

6. What are the various methods of purifying the water?

Ans: The various methods of water are of different types 

1. physical process such as filtration, sedimentation, distillation

2. Chemical process such as chlorination, flocculation etc

3. Biological process such as slow sand filter and biological active carbon 

Comments

Post a Comment

Popular posts from this blog

Our nervous system and sense organs

-
 Important question answer from the topic Nervous system  A. Which one is correct ? 1. Our nervous system consists of the brain, the spinal cord and the a. blood vessels b. nerves c. lungs  Ans: c) lungs 2. Our brain needs a constant supply of a. oxygen b. nitrogen c. lungs Ans: a) oxygen 3. When we happen to touch a hot object, the sensory nerve immediately passes a message to the a. brain b. spinal cord c. hands Ans: a) brain 4. ______is the largest organ in our body. a. skin b. nose C. ears Ans: a) skin B. Fill in the blanks : 1. The brain is control centre of the body . 2. The brain has three parts . 3. There are nerve endings on the upper part of the nose . 4. The coloured circle in the eye is the iris . C. Write 'T' for true or 'F' for false : 1. The cerebellum coordinates the actions of the muscles. Ans: True  2. The actions controlled by the spinal cord are called reflex actions.  Ans: True 3. The ears enable us to keep our balance. Ans: True 4. The pupil i
Read full article....

Weather , climate and adaptation

-
  1. What is the primary source of energy which causes changes in the weather ? Ans: Sun is the primary source of energy which causes changes in weather . 2. Name any two activities of our daily life which are planned according to the weather on a day.  Ans: We wear light coloured clothes during summer days and we prefer to wear dark colour clothes in winter . 3. What term is used to denote the amount of water vapour (or moisture) in air ? Ans: The term humidity is used to denote the amount of water vapour (or moisture) in air . 4. Name the instrument used to measure the rainfall at a place.  Ans: The instrument used to measure the rainfall at a place is rain gauge . 5. Name the unit in which rainfall is measured.  Ans: Millimeters (mm) is the unit in which rainfall is measured . 6. Which of two changes frequently weather or climate ? Ans: Weather changes frequently . 7. Name one state (or region) each in India having the following (a) Very hot and wet  Kerala (b) Hot and dry         
Read full article....

Respiration in organisms

-
Very Short Answer Type Questions 1. Name the process by which energy is released from the digested food  Ans: The process by which energy is released from the digested food is respiration . 2. Name the two gases which are exchanged during relation  Ans: The two gases which are exchanged during relation are oxygen and carbon di oxide . 3. State whether the following statements are true or false (a) Respiration is a type of combustion at ordinary temperature. True (b) Oxygen is released during the process of respiration False (c) Energy can be released in the cells without oxygen True (d) During heavy exercise, the breathing rate of a person slow down  False (e) The size of chest cavity increases during inhalation True . (f) Frogs breathe through lungs as well as skin True (g) Fish has lungs for breathing False (h) Whales and dolphins live in water and heathe through gills False . (i) Insects breathe through spiracles and tracheae True 4. Nane an animal in which exchange of gases during
Read full article....