Class IX

Gametes in maize plants have
  1. 10 chromosomes
  2. 20 chromosomes
  3. 30 chromosomes
  4. 46 chromosomes
Deforestation is caused due to
  1. grazing
  2. timber
  3. Cultivation
  4. all of these
If whole of topsoil is washed down, erosion is said to be
  1. sheet erosion
  2. gully erosion
  3. shelter wash off
  4. wind erosion
Front ribs are attached to the
  1. diaphragm
  2. external intercostal muscles
  3. sternum
  4. internal intercostal muscles
To form one glucose molecule (C6H12O6), number of water molecules required are
  1. six
  2. eight
  3. ten
  4. twelve
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