GS Biology Questions and Answers

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Q181
Plants absorb dissolved nitrates from soil and convert them into
  • A free nitrogen
  • B urea
  • C ammonia
  • D proteins
Answer: Option A
Q182
Poison glands of snakes are homologous to
  • A electric organs of fishes
  • B stings of rays
  • C sebaceous glands of mammals
  • D salivary glands of vertebrates
Answer: Option D
Q183
 Pyorrhoea is a disease of the
  • A nose
  • B gums
  • C heart
  • D lungs
Answer: Option B
Q184
Most fish do not sink in water because of the presence of     swim bladder     air bladder     air sacs     air in spongy bones
  • A I and II are correct
  • B II and III are correct
  • C III and IV are correct
  • D I, II, III and IV are correct
Answer: Option A
Q185
Plants synthesis protein from
  • A heterosis
  • B fusion
  • C mitosis
  • D None of these
Answer: Option C
Q186
Prokaryotic cells lack
  • A nucleolus
  • B nuclear membrane
  • C membrane bound by organelles
  • D All of these
Answer: Option D
Q187
Plants growing on sand are called as
  • A chasmophytes
  • B oxylophytes
  • C lithophytes
  • D psammophytes
Answer: Option D
Q188
Pigmentation of skin is due to
  • A lymphocytes
  • B monocytes
  • C leucocytes
  • D melanocytes
Answer: Option D
Q189
Nitrogen is fixed in ecosystems in ways stated below. Which one of the statements below is false?
  • A By cyanobacteria
  • B By electrical discharges in the atmosphere
  • C By industrially synthesised fertilizer
  • D By denitrification
Answer: Option D
Q190
Plants developing in dry conditions are
  • A xerophytes
  • B mesophytes
  • C lithophytes
  • D hydrophytes
Answer: Option A

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