The phosphorus cycle differs from the carbon cycle in that:
a. Phosphorus does not enter living organisms, whereas carbon does.
b. The phosphorus cycle does not include a gaseous phase, whereas the carbon cycle does.
c. The phosphorus cycle includes a solid phase, whereas the carbon cycle does not
d. The primary reservoir of the phosphorus cycle is the atmosphere, whereas the primary reservoir for the carbon cycle is in rock.

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 79%
From NCERT
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Which of the following changes would not result in an increase in net primary production?

(1) Increased precipitation in an and area

(2) Increased soil fertility

(3) Increased latitude (moving from the equator toward the poles)

(4) Moving down a mountain to warmer temperatures

Subtopic:  Ecosystem Productivity |
 67%
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Grasslands can support greater grazing rates by herbivores than forests because:

(1) Grasslands receive more sunlight

(2) The net production of grasslands is greater

(3) Grasslands produce less woody plant tissue

(4) More of the grassland production is above ground

Subtopic:  Components & Types of Ecosystems |
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The amount of energy reaching an upper trophic level is determined by:

1. Net primary production

2. Net primary production and the efficiencies with which food energy is converted to biomass

3. Gross primary production

4. Gross primary production and the efficiencies with which food energy is converted to biomass

Subtopic:  Ecosystem Productivity |
 67%
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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) |
 75%
From NCERT
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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 |
 71%
From NCERT
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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%
From NCERT
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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 |
 63%
From NCERT
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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 |
 65%
From NCERT
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