A functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment, is called as:
1.A population2.A species
3.A biological community4.An ecosystem
Subtopic:  Introduction |
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Energy flow and nutrient cycling are two important components of an ecosystem. What will be true comparison of the two?

1.  The amount of energy is much greater than the amount of nutrients
2.  Organisms always need nutrients, but they don't always need energy
3.  Nutrients are recycled, but energy is not
4.  Organisms always need energy, but they don't always need nutrients

Subtopic:  Mineral Cycling & Ecosystem Services (OLD NCERT) |
 74%
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Vertical distribution of different species occupying different levels in an ecosystem is called:
1.  Stratification 2.  Scarification
3.  Standing crop 4.  Standing state
Subtopic:  Introduction |
 93%
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Productivity is the rate of production of biomass expressed in terms of :
i. (kcal m-3) yr-1
ii. g m-2 yr-1
iii. g m-1 yr-1
iv. (kcal m-2) yr-1

1.ii2.iii
3.ii and iv4.i and iii

Subtopic:  Ecosystem Productivity |
 85%
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In an ecosystem, the rate of production of organic matter during photosynthesis is called as its:
1. Gross Primary productivity
2. Net Primary productivity
3. Secondary productivity
4. Non productivity

Subtopic:  Ecosystem Productivity |
 86%
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Net primary productivity is the gross primary productivity minus:

1.  that which is consumed by herbivores
2.  that which is consumed by the producer in metabolism
3.  secondary productivity
4.  loss due to mortality
Subtopic:  Ecosystem Productivity |
 82%
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The annual net primary productivity of whole biosphere is approximately:

1.25 billion tons2.55 billion tons
3.70 billion tons4.170 billion tons

Subtopic:  Ecosystem Productivity |
 78%
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By process of leaching during decomposition of detritus, water soluble :

1.  organic nutrients go down the soil horizon and get precipitated as available salts
2.  inorganic nutrients go down the soil horizon and get precipitated as unavailable salts
3.  organic nutrients go down the soil horizon and get precipitated as available salts
4.  inorganic nutrients go down the soil horizon and get precipitated as available salts
Subtopic:  Decomposition |
 71%
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The three steps of decomposition occur:
1. sequentially, with catabolism being the last step.
2. sequentially, with leaching being the last step.
3. simultaneously.
4. sequentially, but not in a particular order.

Subtopic:  Decomposition |
 67%
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Decomposition of detritus is rapid when:
1. It is rich in lignin and chitin
2. Ambient temperature is low
3. Environment favours anaerobiosis
4. It predominantly contains nitrogen and sugars

Subtopic:  Decomposition |
 81%
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