Which one of the following is not a functional unit of an ecosystem?

1. Energy flow                 

2. Decomposition

3. Productivity                 

4. Stratification

Subtopic:  Introduction |
 85%
From NCERT
NEET - 2012
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Which one of the following statements for pyramid of energy is incorrect, whereas the

remaining three are correct ?

1. It shows energy content of different trophic level organisms

2. It is inverted in shape

3. It is upright in shape

4. Its base is broad

Subtopic:  Ecological Pyramids |
 88%
From NCERT
NEET - 2011
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Of the total incident solar radiation the proportion of PAR is 

1. about 60%

2. less than 50%

3. more than 80%

4. about 70%

Subtopic:  Energy Flow |
 90%
From NCERT
NEET - 2011
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The biomass available for consumption by the herbivores and the decomposers is called

1. net primary productivity

2. secondary productivity

3. standing crop

4. gross primary productivity

Subtopic:  Ecosystem Productivity |
 70%
From NCERT
NEET - 2010
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Which one of the following is one of the characteristics of a biological community ?

1. Stratification 

2. Natality 

3. Mortality 

4. Sex-ratio

Subtopic:  Introduction |
 82%
From NCERT
NEET - 2010
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Which one of the following is not used for construction of ecological pyramids?

1. Dry weight

2. Number of individuals

3. Rate of energy flow

4. Fresh weight

Subtopic:  Ecological Pyramids |
 80%
From NCERT
NEET - 2006
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Energy flow in an ecosystem is 

(1) unidirectional

(2) bidirectional

(3) multi-directional

(4) All the these 

Subtopic:  Energy Flow |
 93%
From NCERT
AIIMS - 2012
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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 |
 72%
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 |
 62%
From NCERT
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