Botany Question with Answer

21. Ozone day is observed on

  1. 25th December
  2. 16th September
  3. 21st April
  4. 30th January.

22. Ozone hole causes

  1. Global warming
  2. Reduction in the rate of photosynthesis
  3. More UV rays come to earth
  4. All the above.

23. Ozone hole is caused by

  1. Acetylene
  2. Ethylene
  3. Chlorofluorocarbons
  4. Methane.

24. Ozone layer is found in

  1. Thermosphere
  2. Stratosphere
  3. Mesosphere
  4. Lithosphere.

25. Pesticide responsible for Ozone depletion is

  1. BHC
  2. DDT
  3. Melathion
  4. None of the above.

26. Pollutants released from paddy field is

  1. CO2
  2. CO
  3. H2O2
  4. CH4.

27. Pudding is done to

  1. Reduce percolation of water
  2. Pulverise and levelling soil
  3. Kill weeds
  4. All of the above

28. Role of CFC present in atmosphere is to

  1. Reduction in ozone
  2. Ozone formation
  3. Formation of leg haemoglobin
  4. Enhance chlorophyll formation.

29. Root suckers are

  1. Insects that suck nutrients from the roots of plants
  2. Shoots that arise from roots to form new plant
  3. New plant parts that arise from the branches of fruit trees
  4. Roots of neighboring plants that share water with the another plant

30. Rootex contains

  1. Auxins
  2. ABA
  3. Kinetin
  4. Ethylene

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