Class XI

Highly concentrated urine is produced by
  1. Freshwater bony fish
  2. Marine bony fish
  3. Marine boneless fish
  4. All three
Homeostatic control mechanism begins with onset of
  1. Trigger
  2. Biosensors
  3. Cillia
  4. Stimuli
 Blood flows through a closed system in
  1. Echinoderms
  2. Nematodes
  3. Most birds
  4. Vertebrates
Water-soluble vitamins need to be supplied
  1. daily
  2. weekly
  3. fortnightly
  4. can easily be stored in body for later use
Cigarette smokers become addicted to
  1. Caffeine
  2. Nicotine
  3. Paludrine
  4. All of these
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