CET-BIOLOGY-JNK-2008 Questions and Answers

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Q21
Respiratory quotient (RQ) is one in case of :
  • A Fatty acids
  • B Nucleic acids
  • C Carbohydrates
  • D Organic acids
Answer: Option C
Q22
An example of free living nitrogen fixing aerobic bacteria is :
  • A Clostridium
  • B Rhizobium
  • C Azotobacter
  • D Rhodospirillum
Answer: Option C
Q23
Identify the plant belonging to the Reed-Swamp stage in hydrarch succession :
  • A Juncus
  • B Sagittaria
  • C Salix
  • D Trapa
Answer: Option B
Q24
A gas produced by paddy fields and connected with global warming is :
  • A CO2
  • B Chlorine
  • C H2S
  • D Methane
Answer: Option D
Q25
If the strong partner is benefited and the weak partner is damaged, it is known as :
  • A Predation
  • B Allelopathy
  • C Symbiosis
  • D Commensalism
Answer: Option A
Q26
Acid rain is mainly caused due to increase in the levels of the gas(es) :
  • A SO2 only
  • B CO2 only
  • C SO2, CO2
  • D NO2 and SO2
Answer: Option D
Q27
The flow of energy among various trophic levels of an ecosystem is :
  • A Unidirectional
  • B Bidirectional
  • C Multidirectional
  • D Circular
Answer: Option A
Q28
Increase in atmospheric temperature due to CO2 is called :
  • A Pasteur effect
  • B Green-house effect
  • C Blackman effect
  • D Emerson effect
Answer: Option B
Q29
The protective-ozone layer is present in :
  • A Ionosphere
  • B Stratosphere
  • C Troposphere
  • D Lithosphere
Answer: Option B
Q30
Decomposition of organic matter is brought about by :
  • A Protozoa
  • B Plants
  • C Micro-organisms
  • D None of these
Answer: Option C

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