Ecosystem TS

In an aquatic food chain, zooplankton occupy which trophic level ?

If in a grassland, GPP is 2000 g m⁻² yr⁻¹ and respiration is 600 g m⁻² yr⁻¹, then NPP is:

Standing crop is measured in :

Secondary productivity occurs in:

Which of the following pairs is correctly matched ?

In nutrient-poor aquatic ecosystems, primary productivity is restricted because:

If only 2% of incident solar radiation (1,000,000 kcal m⁻² yr⁻¹) is fixed by producers, GPP will be:

Which factor does NOT affect decomposition ?

In which environment is decomposition rate fastest ?

The major decomposers in an ecosystem are :

If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be :

Which process during decomposition releases soluble substances into soil water ?

Decomposition releases :

During decomposition, the detritus is fragmented by:

Mineralisation results in release of :

Detritus food chain begins with :

In an aquatic ecosystem, primary consumers are :

Which of the following has inverted biomass pyramid ? 

The relationship between energy flow and trophic levels is best represented by :

Which law of thermodynamics is directly applied in energy flow through ecosystem ?

Identify the incorrectly matched pair:

Which one is a result of humification ?

Which is NOT true about decomposition ?

Humus is important because :

Organisms at each trophic level depend on those at the lower level trophic level for their energy demands except :

Which is true about humus ?

Which food chain is major conduit for energy flow in a forest ecosystem ?

In most ecosystems, the least biomass is found at : 

Which relation is correct ?

Which is the largest reservoir of carbon on Earth ?

Assertion (A): Energy flow in an ecosystem is unidirectional.
Reason (R): Energy is lost as heat at each trophic level and cannot be recycled.

Assertion (A): Decomposers are essential for nutrient cycling.
Reason (R): They convert organic wastes into inorganic forms usable by producers.

Per unit area, which ecosystem shows the highest primary productivity ?

The flow of energy in an ecosystem is :

In nutrient-poor waters, primary productivity is limited despite adequate light because :

Food web is more stable than food chain because :

If GPP increases from 1500 to 2000 g m⁻² yr⁻¹ and respiration rises from 300 to 800 g m⁻² yr⁻¹, the change in NPP will be :

Which of the following is NOT a detritus feeder ?

Which of the following processes releases carbon dioxide back to atmosphere ?

Assertion (A): Saprophytes play an important role in detritus-based food chains.
Reason (R): They break down dead organic matter into simpler compounds, releasing nutrients back to soil.

The first trophic level is always occupied by :

Which pyramid is always upright ?

Which of the following is not an ecosystem service provided by energy flow ?

Which is NOT a factor directly affecting primary productivity ?

In a terrestrial ecosystem, the pyramid of biomass is generally :

In a pond ecosystem, pyramid of biomass is generally :

Which one shows inverted pyramid of numbers ?

During decomposition, resistant organic matter accumulates as :

 Which of the following statements is INCORRECT ? 

Which of the following is true about PAR (Photosynthetically Active Radiation) ?