Class XI

Upon dissolving sodium hydrogen carbonate (HCO3-) in water (H2O), gas given off is
  1. hydrogen
  2. oxygen
  3. carbon dioxide
  4. all of these
In dogs, mechanisms to loose heat include all but
  1. hanging tongue out
  2. heavy panting
  3. wet footprints
  4. blubber beneath their skin
Xylem and phloem are not bundled together in
  1. stem
  2. leaf
  3. root
  4. all of these
 Purpose of this organ is not known in digestion. This organ is
  1. intestinal glands
  2. lymphatic vessels
  3. appendix
  4. micro-organisms living in stomach
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