Available Answers

1. 1.

   Fill in the blanks.

   1. ___________ is a parasitic protozoan that causes 'sleeping sickness'.
   2. ___________ is the nitrogen-fixing bacteria.
   3. ___________ kill the pest but do not harm the plants.
   4. ___________ is a natural process of soil.
2. 2.

   Multiple choice question:

   1. Which of the following is used for marking pencil lead?
      1. Diamond
      2. Phosphorus
      3. Silicon
      4. Graphite
   2. A household variety of coal is
      1. Peat
      2. Bituminous
      3. Anthracite
      4. Lignite
   3. Burning of a substance in the presence of air is known as
      1. Rusting
      2. Combustion
      3. Reduction
      4. Corrosion
   4. The colour of the outermost zone of the flame is
      1. Blue
      2. Yellow
      3. Red
      4. Green
3. 3.

   What term is used for rearing animals on large scale?
4. 4.

   Name the edible fungi.
5. 5.

   What happens to natural gas when it is burnt?
6. 6.

   Which non-metal is a good conductor of electricity?