Saturday, March 9, 2019

Ecosystems: Previous Year Questions Part 3

ECOSYSTEMS


2016 MARCH
1.     Nutrients are never lost from the ecosystems and are recycled. Write about

a)      Gaseous cycle
b)      Sedimentary cycle                      (Scores:1+1)
2.     On earth, life exists even in extreme and harsh conditions. Mention any two major biomes in India.                          (Score: 1)
3.     Ecological pyramids are usually upright. Meanwhile some, pyramid of biomass is inverted. Explain the reason.     (Scores: 2)
2016 SAY
1.     (a) Biogeochemical cycle is an important phenomenon in very ecosystem. Describe phosphorus cycle. (Scores: 3)
OR
(b) The plant communities in a given area show successive changes. Mention the stages of succession in a xerosere.
2.     Earthworms are commonly referred as farmers’ friends. Define fragmentation. (Score 1)
MARCH 2017
1.     The different stages of primary succession in water are represented below. Fill the gaps that are unfilled.
(a) Phytoplankton
(b) ……………..
(c) Submerged free floating plant stage
(d) ……………..
(e) ……………..
(f) Shrub stage
(g) ……………..                    (Scores: ½ X 4 = 2)
2.     An ecosystem consists of the following population:
Phytoplankton
Man
Fish
Zooplankton
Draw a food chain denoting each trophic level.      (Scores: ½ X 4 = 2)
MARCH 2018
1.     The products of ecosystem processes are named as ecosystem services. list out any four such services.
2.     Pyramid of energy is never been inverted. Why?

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