Class IX

. Living things are
  1. open systems
  2. closed systems
  3. partially open systems
  4. dark systems
Polypeptides are converted into amino acids through
  1. pepsin
  2. trypsin
  3. erepsin
  4. rennin
Chemical spraying in agriculture may contaminate
  1. vegetables
  2. fruits
  3. farmers
  4. underground water
In grass, pollination is affected through
  1. filament protruding out of bract
  2. mature stigma protruding out of bract
  3. immature petals and sepal
  4. both A and B
Appendix and caecum are characteristic features of
  1. omnivores
  2. herbivores
  3. carnivores
  4. all of these
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