Saturday, March 9, 2019

Ecosystems: Previous Year Questions Part 2


2013 MARCH
1.     Final community that is in near equilibrium with environment in ecological succession is called (1)

2.     Natural interlinked food chains are called (1)
3.     A list of organisms is given. Place them in different trophic levels. (2)
Grass, Man, Fishes, Birds, Lion, Grasshopper, Zooplankton, Trees
2013 SAY
1.     In the equation, GPP – R = NPP; If NPP = Net primary productivity. Explain GPP – R = NPP (2)
2.     Which of the following is a detritivore? (1)
1) Earthworm                               2) Virus                                  3) Fox                                     4) Cow
2014 MARCH
1.     The species that invade a nude area are called ----------- species. In a primary succession on rocls, the group that invade first are usually -------------- (1)
2.     The rate of biomass production in an ecosystem is called productivity. They are of 2 types, gross primary productivity and net primary productivity. How these productivities are related? (1)
3.     A list of different organisms in an ecosystem is given below. Arrange them in 1st, 2nd, 3rd and 4th trophic level. (2)
              i.    Phytoplankton   ii.   Man                 
iii.   Fish                  iv.   Zooplankton
2014 SAY
1.     By observing the relationship of the first pair fill up the blanks:
a.     Grazing food chain consists of producers and consumers whereas Detritus chain comprises dead organic matter and ---------------
b.     Nitrogen: Gaseous cycle            Sulphur: ……………….. (½ + ½ =1)
2.     Field survey by a team of students recorded the following data related to biomass of the organisms in each trophic level of an ecosystem. Draw, name and explain the pyramid. (2)
3.     Gradual, sequential change of a given area including species composition is known as ecological succession. If so name the first stages of the succession in hydric area. (1)
2015 MARCH
1.     Given below are the components related to simplified model of mineral cycling in a terrestrial ecosystem. Construct a flow chart.
[Hint: weathering of rock]            (Score: 2)
2.     Primary succession on rocks is known as Xerosere. Answer the following related with Xerosere.
(a) Name the pioneer community.
(b) Organic acids have important roles in this succession. Justify.     (Scores: 1 + 1 = 2)
2015 SAY
1.     By observing the relationship of first pair, fill up the blanks.
a.     Net primary productivity = Gross primary productivity – respiration
Gross primary productivity is ………….
b.     Carbon: Gaseous cycle              Phosphorus: …………..      (Score: ½ + ½ = 1)
2.     Field survey by a team of students recorded the following data related to number of organisms in an ecosystem and plotted that into a figure shown below:
Observe the figure and explain the pyramid.    (Scores: 2)
3.     Hydrosere succession stages are given below. Arrange them in order. (Scores: 1)
Scrub stage – forest – submerged free floating – Marsh Meadow – Submerged stage – Reed swamp – Phytoplankton 


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