Air

I. Fill in the blanks:

1. There is air till a height of about 50 km from the earth.

2. The air at a greater height from the earth is rare than the air nearer to the earth.

3. If all the air was divided into five parts the oxygen in the air would equal one-fifth part.

4. There is air even in an empty container.

5. The layers of air nearer the earth bear more weight than the upper layers.

II Write whether the following sentences are True or False 

1. Water is lighter than  air.  False

2.The air  at greater height is rare.  True

3.There is no water vapour in the air. False

4.Plants use carbon  dioxide gas  while preparing their food. True

5. The shape of the earth is like a ball. True

III  Answer the following questions.

1. What is an atmosphere?

Ans The covering of air all around the earth is called atmosphere.

2. Name the constituent of air that helps in burning.

Ans Oxygen is the constituent of air that helps in burning.

3.Which gas is present in soda water?

Ans Carbon dioxide is present in soda water.

4.What  gets mixed with the air when water boils?

Ans Water vapour gets mixed with the air when water boils.

A Look Inside The Body

Q1. What is meant by internal organs?

Ans.  The numerous important functions that go on inside our body are carried out by different organs.

These organs are inside our body. They cannot be seen from the outside. Thus, they are called internal organs.

Q2. Name the two cavities in the abdomen.

Ans. The cavity inside the abdomen has two parts. They are the abdominal cavity and the pelvic cavity.

Q3. Which important organs are situated in the ribcage in the thoracic cavity?

Ans. The heart and the lungs are situated in the ribcage  in the thoracic cavity.

Q4. Write the functions of the heart.

Ans. The functions of the heart are -

1. The heart keeps the blood flowing through the blood vessels spread throughout the body.

2. The heart is continuously contracting and relaxing. The contractions of the heart pushes the blood from the heart into the blood vessels.

Q5. Why is the brain situated in the casing of the skull  ?

Ans : Brain is a very important internal organ.It  controls all that we do. Injury  to the brain can make one disabled  for life It can even  cause death .Hence the brain is situated in the casing of the skull.

Home Remedies

I.  Fill in the blanks with the correct word : 

1. One must wash and clean a wound before applying tincture of iodine on it.

2. The Municipal Corporation of big cities also run hospitals that give medical treatment.

3. The Mantrik chants the mantra against the action of snake’s poison.

4. A service that takes care of the health of the people is called health service.

5. Minor illness can be cured by home remedies.

6. If the eyes turn yellow doctor says that it is jaundice.

7. The anti- snakebite injection is available at government hospital.

8. Even if the illness appears to be minor it should never be neglected.

II     Answer the following questions :

1. What is the home remedy for cold?

Ans : The home remedy for cold is taking hot fomentation on the chest or inhale steam at bed time

2. What should be done to a patient who is vomiting continuously ?

Ans:   When a patient is vomiting continuously we should give him cool lemon sherbet and something light like dahibhat.

Less. 17 & 18 My Upbringing and

Changes in the Family and Neighbourhood 

I. Answer the following questions :

Q. 1 Why do people migrate?

Ans People migrate for better living, jobs, occupations or education.

Q.2 Why did it become impossible to feed everyone in the family by farming alone?

Ans As many relations stayed together and formed a big family it became impossible to feed everyone in the family by farming alone.

Q.3 How do we become familiar with diversity?

Ans When people from another place happen to be our neighbours, we naturally get to know about their speech, food and eating habits, festivals, etc which may be different from ours. This influences our upbringing and we become familiar to diversity.

II. Write True or False:

1. As we migrate, we see the diversity in our country. True

2. Changes do not take place in our family or neighbourhood. False

3. Many birds migrate in search of food and shelter. True

4. Our loved ones try hard to see that we develop good habits. True

5. We do not learn through observation and exposure. False

III. Name the following:

1. These influence our upbringing – Parents, relatives and neighbours

2. This man spent his entire life in social service –  Baba Amte

3. Moving from one place to another in order to live – migration

4. A migrating bird – flamingo