Class XI

Stomata close
  1. in very strong wind
  2. in night
  3. at very high temepratures
  4. both A and B
Function of trace elements is to
  1. trace benefits of minerals
  2. trace benefit of vitamins
  3. trace benefits of proteins
  4. none of above
Example sof analgesics include
  1. caffeine
  2. Cocaine
  3. Novocain
  4. Aspirin
Basic building block of protoplasm is
  1. lipids
  2. amino acids
  3. unsaturated fats
  4. cytoplasm
Number of bronchial tubes, left bronchus gets divided into are
  1. two
  2. three
  3. depends on age of organism
  4. varies in man
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