Q.1: Vertical distribution of different species occupying different levels is called _______________.
a) interaction
b) stratification
c) enumeration
Q.2: ________________ of an ecosystem is the rate of production of organic matter during photosynthesis.
a) productivity
b) secondary productivity
c) gross primary productivity
Q.3: Net primary productivity is the biomass for the consumption to ______________.
a) autotrophs
b) heterotrophs
c) both
Q.4: Which of the following is not an important step in the process of decomposition ?
a) catabolism
b) leaching
c) productivity
Q.5: In ______________ process, the humus is degraded by some microbes and release the inorganic nutrients.
a) mineralisation
b) fragmentation
c) humification
Q.6: The decomposition rate is ____________, if detritus is rich in lignin and chitin.
a) slower
b) faster
c) normal
Q.7: Which of the following belongs to the third trophic level ?
a) phytoplankton, grass
b) man, lion
c) birds, fish
Q.8: To obtain the Net Primary Productivity, we have to minus respiration losses from ___________________.
a) secondary productivity
b) gross primary productivity
c) both
Q.9: Each trophic level has a certain mass of living material at a particular time called as the _________________.
a) Standing Crop
b) Sere
c) Standing state
Q.10: Which of the following statements is/are true about Nutrient cycling ?
a) The other name of nutrient cycling is ‘biogeochemical’ cycles.
b) Nutrient cycling is of three types.
c) Both
Q.11: ____________ succession takes place in dry areas.
a) mesic
b) hydrarch
c) xerarch
Q.12: ___________________ is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems.
a) carbon
b) phosphorous
c) nitrogen
Q.13: According to an estimation, ______________ of carbon is fixed annually in the biosphere through photosynthesis.
a) 4 x 1013 kg
b) 3 x 1014 kg
c) 4 x 1014 kg
Q.14: Why is the secondary succession faster than the primary succession ?
a) Because of the presence of the vegetation.
b) Because of the presence of the soil or sediment.
c) Because of the presence of the climatic conditions.
Q.15: Phosphorous cycle is an example of ____________ cycle.
a) gaseous
b) sedimenatary
c) none
Q.16: The entire sequence of communities that successively change in a given area are called __________.
a) seres
b) climax
c) pioneer
Q.17: _______________ are not given any place in ecological pyramids.
a) herbivores
b) producers
c) saprophytes
Q.18: ______ % of the photosynthetically active radiation is captured by the green plants.
a) 2-5
b) 10-20
c) 2-10
Answers:
- b
- c
- b
- c
- a
- a
- c
- b
- a
- a
- b
- b
- a
- b
- b
- a
- c
- c
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