Class XI

Cigarette smokers become addicted to
  1. Caffeine
  2. Nicotine
  3. Paludrine
  4. All of these
 Blood flows through a closed system in
  1. Echinoderms
  2. Nematodes
  3. Most birds
  4. Vertebrates
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
Water-soluble vitamins need to be supplied
  1. daily
  2. weekly
  3. fortnightly
  4. can easily be stored in body for later use
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