1.   Fill the missing word in the blank spaces in the following statements:

(a) Wind is——————air.

(b) Winds are generated due to——————heating on the earth.

(c) Near the earth’s surface __________air rises up whereas ___________ air comes down.

(d) Air moves from a region of ——— pressure to a region of——— pressure

2. Suggest two methods to find out wind direction at a given place.

2. Suggest two methods to find out wind direction at a given place.

3. State two experiences that made you think that air exerts pressure (other than those given in the text).

4. You want to buy a house. Would you like to buy a house having windows but no ventilators? Explain your answer.

Tick the most suitable answer in question

1. In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants

 

5. Explain why holes are made in hanging banners and hoardings.

6. How will you help your neighbours in case cyclone approaches your village/town?

7. What planning is required in advance to deal with the situation created by a cyclone?

8. Which one of the following place is unlikely to be affected by a cyclone.

(i) Chennai

(ii) Mangaluru (Mangalore)

(iii) Amritsar

(iv) Puri

9. Which of the statements given below is correct?

(i) In winter the winds flow from the land to the ocean.

(ii) In summer the winds flow from the land towards the ocean.

(iii) A cyclone is formed by a very high-pressure system with very high-speed winds revolving around it.

(iv) The coastline of India is not vulnerable to cyclones.

1. Fill in the blanks:

(a) The main steps of nutrition in humans are __________, __________, __________, _________ and __________.

(b) The largest gland in the human body is __________.

(c) The stomach releases hydrochloric acid and ___________ juices which act on food.

(d) The inner wall of the small intestine has many finger-like outgrowths called _________.

(e) Amoeba digests its food in the ____________ .

2. Mark ‘T’ if the statement is true and ‘F’ if it is false:

(a) Digestion of starch starts in the stomach. (T/F)

(b) The tongue helps in mixing food with saliva. (T/F)

(c) The gall bladder temporarily stores bile. (T/F)

(d) The ruminants bring back swallowed grass into their mouth and chew it for some time. (T/F)

3. Tick mark the correct answer in the following question:

(a) Fat is completely digested in the

(i) stomach

(ii) mouth

(iii) small intestine

(iv) large intestine

3. Tick mark the correct answer in the following question:

b) Water from the undigested food is absorbed mainly in the

(i) stomach

(ii) foodpipe

(iii) small intestine

(iv) large intestine

4. Match the items of Column I with those given in Column II:

   Column I                               Column II

Food components                Product(s) of digestion

Carbohydrates                     Fatty acids and glycerol

Proteins                                Sugar

Fats                                       Amino acids

What are villi? What is their location and function?

6. Where is the bile produced? Which component of the food does it help to digest?

7. Name the type of carbohydrate that can be digested by ruminants but not by humans. Give the reason also.

8. Why do we get instant energy from glucose?

9. Which part of the digestive canal is involved in:

(i) absorption of food ________________.

(ii) chewing of food ________________.

(iii) killing of bacteria ________________.

(iv) complete digestion of food ________________.

(v) formation of faeces ________________.

10. Write one similarity and one difference between the nutrition in amoeba and human beings.

11. Match the items of Column I with suitable items in Column II

Column I                          Column II

(a) Salivary gland           (i) Bile juice secretion

(b) Stomach                   (ii) Storage of undigested food

(c) Liver                          (iii) Saliva secretion

(d) Rectum                     (iv) Acid release

(e) Small intestine          (v) Digestion is completed

(f ) Large intestine          (vi) Absorption of water

                                       (vii) Release of faeces

12.Label Fig. 2.11 of the digestive system.

        

13. Can we survive only on raw, leafy vegetables/grass? 

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