Class IX

Profuse growth of algae occurs due to
  1. hydrogen sulphide in water
  2. nitrates and phosphates in water
  3. carbon dioxide in water
  4. all of these
Larvae breath through
  1. feeding brushes
  2. pair of air floats
  3. pair of spiracles
  4. pair of gills
In expiration
  1. diaphragm relaxes and arches upwards
  2. air enters lungs
  3. ribs move upwards
  4. sternum moves up and away from backbone
Enzymes are largely
  1. fat-based
  2. Carbohydrates-based
  3. protein-based
  4. Minerals-based
Runny nose and crying may be outcomes of
  1. hay fever
  2. downs syndrome
  3. excess tears
  4. stress or depression
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