Class XI

 Backflow of blood into ventricle is
  1. Prevented through bicuspid valves
  2. Revented through tricuspid valves
  3. Prevented through mitral valve and chordae tendineae
  4. Prevented through semilunar valves
Fibrinogen is a form of
  1. Soluble starch
  2. Soluble proteins
  3. Insoluble proteins
  4. Insoluble polysaccharide
Plants do not produce
  1. Cellulose
  2. Lignin
  3. Cellulose
  4. Amylase
More energy is available in a
  1. Shorter food chain
  2. Longer food chain
  3. Smaller food cycle
  4. Larger food cycle
Stimulant drugs are not used to treat
  1. Depression
  2. Fatigue
  3. Insomnia
  4. Induce sleep
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