Q.1: Vertical distribution of different species occupying different levels is called _______________.
Q.2: ________________ of an ecosystem is the rate of production of organic matter during photosynthesis.
b) secondary productivity
c) gross primary productivity
Q.3: Net primary productivity is the biomass for the consumption to ______________.
Q.4: Which of the following is not an important step in the process of decomposition ?
Q.5: In ______________ process, the humus is degraded by some microbes and release the inorganic nutrients.
Q.6: The decomposition rate is ____________, if detritus is rich in lignin and chitin.
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
Q.9: Each trophic level has a certain mass of living material at a particular time called as the _________________.
a) Standing Crop
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.
Q.11: ____________ succession takes place in dry areas.
Q.12: ___________________ is a major constituent of biological membranes, nucleic acids and cellular energy transfer systems.
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.
Q.16: The entire sequence of communities that successively change in a given area are called __________.
Q.17: _______________ are not given any place in ecological pyramids.
Q.18: ______ % of the photosynthetically active radiation is captured by the green plants.