Available Answers

1. 1.

   Choose the correct option.

   1. Which of the following is the natural and solid form of water?
      1. Rain, water, sea
      2. Ice, snow, river
      3. Ice, snow, hail
      4. Water vapour, rain, river
   2. Which gas is produced when something is burnt?
      1. Oxygen
      2. Water vapour
      3. Carbon dioxide
      4. Nitrogen
   3. Which gas is needed for respiration by animals?
      1. Oxygen
      2. Water vapour
      3. Carbon dioxide
      4. Nitrogen
   4. Which of the following is not a non-biodegradable waste?
      1. Glass
      2. Plastic
      3. Dead plants and animals
      4. Metals
   S A M P L E

   www.bigslate.com

   Answer:

   S A M P L E

   1. (c) Ice, snow, hail
   2. (c) Carbon dioxide
   3. (a) Oxygen
   4. (c) Dead plan
2. 2.

   Fill in the blanks with the correct words.

   1. Cluster of tiny ______________ (water/carbon dioxide) droplets floating in air is what we call a cloud.
   2. Plants have tiny pores called the ______________ (stomata/spiracles) through which air enters the plant.
   3. Gills in fishes help them to take in ______________ (oxygen/nitrogen).
   4. Recycling of organic wastes by burying them in compost pits is called ______________ (composting/landfills).
   S A M P L E

   www.bigslate.com

   Answer:

   S A M P L E

   1. water
   2. stomata
   3. oxygen
   4. composting
3. 3.

   Circle the odd one.

   1. Hail	Rain	River	(Hint: It is not liquid.)
   2. Drought	Famine	Water cycle	(Hint: It is not a natural disaster.)
   3. Respiration	Burning	Photosynthesis	(Hint: Carbon dioxide is not released)
   4. Whale	Dolphin	Earthworm	(Hint: It does not breathe through lungs.)
   5. Vegetable peels	Dead flowers	Glass bottles	(Hint: It is not a part of vermicomposting.)

    

   S A M P L E

   www.bigslate.com

   Answer:

   S A M P L E

   1. River
   2. Water cycle
   3. Photosynthesis
   4. Earthworm
   5. Glass bottles
4. 4.

   Name the three states of water that exists in nature, with examples of each.

5. 5.

   What is an epidemic?

6. 6.

   How do aquatic plants such as Hydrilla breathe in oxygen?