Fill in the blanks, in the following simplified model of a nutrient cycle:

           1             2                    3                       4                  5

(1) Producers   Detritus         Soil solution      Decomposition    Weathering

(2) Producers   Detritus         Soil solution      Weathering         Decomposition

(3) Producers   Soil solution   Detritus            Decomposition    Weathering

(4) Producers   Soil solution   Detritus            Weathering         Decomposition

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 74%
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The given figure best represents:

(1) Pyramid of number in parasitic food chain

(2) Pyramid of biomass in forest ecosystem

(3) Pyramid of number in grassland ecosystem

(4) Pyramid of number in forest ecosystem

Subtopic:  Ecological Pyramids |
 64%
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Which of the following is/are incorrect:

A. All ecosystems are constant in size
B. In nature food chains exist, not food web
C. Flow of energy in ecosystem is unidirectional
D. Gene flow occurs between 2 different population (of 2 species)

(1) A, C

(2) A, D

(3) A, B, D

(4) A, B, C, D

Subtopic:  Energy Flow |
 73%
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The important step in the process of decomposition in order is:

1. Catabolism → Fragmentation → Leeching → Humification → Mineralization
2. Catabolism → Fragmentation → Humification → Leeching → Mineralization
3. Fragmentation → Humification → Catabolism → Leeching → Mineralization
4. Fragmentation → Leeching → Catabolism → Humification → Mineralization

Subtopic:  Decomposition |
 82%
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Which of the following is false?

I. Quantity of biomass in a trophical level at a particular period is called standing crop.
II. The energy content in a trophic level is determined by considering a few individuals of a species         in that trophic level.
III. The succession that occurs in nearly cooled lava is called primary succession.
IV. Rate of succession is faster in the secondary succession
V. Phytoplankton are the pioneers in aquatic succession

(1) Only II

(2) Only III

(3) Only V

(4) Only I and IV

Subtopic:  Energy Flow |
 61%
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The amount of biomass or organic matter produced per unit area over -a time period by plants during photosynthesis is called primary production, which is expressed as:

(1) g m−2

(2) kcal m−2

(3) (kcal m−2) yr−1

(4) Both (1) and (2)

Subtopic:  Ecosystem Productivity |
 66%
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An ecosystem, which can be easily damaged, but can recover after some time if damaging effect stops will be having:

(1) High stability and high resilience

(2) Low stability and high resilience

(3) High stability and low resilience

(4) Low stability and low resilience

Subtopic:  Ecological Succession (OLD NCERT) |
 61%
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During the stages of succession in a given ecosystem the following changes in characteristics may be observed:

Characteristic Stages in ecosystem development
  Early Late
A. Total matter Low High
B. Species diversity Low High
C. Size of organism Small Large
D. Productivity Low High
E. Food chains Short Long

Which one of the characteristics, A, B, C, D or E is responsible for the apparent high degree of stability associated with a climax ecosystem?

(1) B

(2) D

(3) A

(4) E

Subtopic:  Ecological Succession (OLD NCERT) |
 52%
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Perturbation of which of the following cycles contributes most to global warming?

(1) The global carbon cycle   

(2) The global water cycle

(3) The global nitrogen cycle 

(4) All of these cycles contribute equally

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 84%
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Some of the stages in the hydrarch are labelled as:

A. Marsh meadow stage
B. Reed swamp stage
C. Submerged plant stage
D. Phytoplankton stage
E. Submerged free floating plant stage

Identify the choice that represents the correct sequence of these stages:

(1) D, C, E, B and A

(2) C, E, A, B and D

(3) B, D, C, A and E

(4) D, E, C, B and A

Subtopic:  Ecological Succession (OLD NCERT) |
 75%
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