Class VII

Plants utilizes water, carbon dioxide and light to produce their own food by
  1. respiration
  2. photosynthesis
  3. circulation
  4. transportation
When animal and plant rot in absence of air there is production of gas called
  1. oxygen
  2. carbon dioxide
  3. bio gas
  4. methane
Plant materials, vegetation and waste from living things are regarded as
  1. fossil fuel
  2. bio mass
  3. coal
  4. crude
Panels which are black painted to trap heat and energy from sun which are hanged at roofs are
  1. solar cells
  2. solar heater
  3. solar furnace
  4. solar battery
Earth releases its heat by eruptions of
  1. volcano
  2. hot springs
  3. geysers
  4. all of them
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