Answer all the questions.

1. Choose the correct answer:(1 × 5 = 5)
   1. Which of the following is insoluble in water?
      1. Chalk
      2. Honey
      3. Sugar
      4. Salt
   2. What was the use of Mashak in the old days?
      1. To carry water
      2. To carry oil
      3. To carry sand
      4. All of these
   3. Burning which of the following fuels leads to more pollution?
      1. Petrol
      2. Kerosene
      3. Firewood
      4. CNG
   4. The person in the picture was fondly known as ……………
      1. Pandit
      2. Mahatma
      3. Bapu
      4. All of these
      
   5. The person shown in the picture is associated with which sports?
      1. Wrestling
      2. Boxing
      3. Kabaddi
      4. None of the above
      
2. Give one-word answers for the following:(1 × 5 = 5)
   1. Name one substance each that would float and sink in water, respectively.
   2. Mount Everest is known by this name in Nepal.
   3. Where is Golconda Fort located?
   4. Name a fuel used at homes for cooking.
   5. Identify the instrument shown in the picture.
      
3. Answer the following in one sentence:(1 × 5 = 5)
   1. What will happen if oil and water are mixed?
   2. Who was Bachendri Pal? Why was she famous?
   3. What is a museum? State its importance.
   4. Why should the available natural resources be used judiciously?
   5. Why does the rate of heartbeat increase when we exercise?
4. Answer the following questions in brief:(2 × 10 = 20)
   1. Why is there a need to protect animals? State any two human activities that lead to the disturbance of wildlife.
   2. What do you understand about food preservation? Name two preservatives available in our kitchens.
   3. Answer the following questions about water:
   1. Percentage of water on Earth.
   2. A source of freshwater.
   3. A source of saltwater.
   4. An animal that lives in water.
   4. Mention the causal organism of malaria and state two symptoms of malaria.
   5. Why does everything float in space?
   6. How do Changpas sustain in the extremely cold climate?
   7. What is a flood? Mention the items one should carry while evacuating during floods.
   8. Why was life for Jatrya difficult in Sindhuri?
   9. Who started the Chipko movement? What was the aim of this movement?
   10. Traditional farming practises depend on environmental factors, whereas modern farming techniques do not. Justify the statement by giving an appropriate reason.
5. Answer the following questions:(3 × 5 = 15)
   1. See the picture and answer:
      1. What is the use of whiskers for the given animal?
      2. Comment about the sense of hearing of this animal?
      3. Why was Project Tiger launched?
      
      OR

      Animals use various signals to communicate with the other members of their groups. State three examples to justify the statement.

6. X is a food item rich in carbohydrates. We can have it with either vegetables or dal. Once we start chewing, it gets reduced to small pieces and starts tasting sweet after some time due to the effect of enzyme Y.
   1. Identify X and Y. (1)
   2. Why X start tasting sweet after being chewed for a while? (1)

   How is the tongue of the given animal different from ours? (1)

   
   OR
   1. Name the glands associated with the digestive system. (1)
7. Identify the gland shown in the picture. (1)
   
8. Which gland is responsible for maintaining the sugar levels in our body? (1)
9. Identify the seed shown in the picture? How is this seed dispersed? Mention how this seed is adapted for the same? (1+1+1)
   
10. ‘A’ is prepared by decomposing plants and animal waste. It is used for increasing soil fertility, whereas ‘B’ is prepared using chemicals and is used for good crop yield.
    1. Out of ‘A’ and ‘B’, which one will be good for the soil in the long run? (1)
    2. Apart from fertility, how does ‘A’ help make the soil better? (1)
    3. Why does ‘B’ harm the soil in the long run? (1)
11. Look at the picture and answer—
    1. What is unique about the children in the picture? (1)
    2. Do they share the same genetic makeup? (1)
    3. What are genes? What are they responsible for? (1/2+1/2)