Class XI

Dead and hardened cells of epidermis result in
  1. Hair follicles
  2. Hair papilla
  3. Hair
  4. Air erector muscles
Due to salt concentrations, aquatic animals are confronted with
  1. N feeding problems
  2. Breathing problems
  3. Excretory problems
  4. Osmotic problems
Egestion is
  1. Same as excretion
  2. Same as defaecation
  3. Removal of metabolic wastes
  4. Removal of toxic wastes
Liver produces urea to remove
  1. Excess hydrogen
  2. Excess hydrogen peroxide
  3. Excess nitrogen
  4. Excess starch
Exhaust motor vehicle is main source of
  1. Manganese
  2. Carbon monoxide
  3. Sulphur dioxide
  4. Nitrogen oxide
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