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What do ‘standing crop’ and ‘standing state’ refer to ?

 

 

 

 
 
 
 
 

Standing crop:

It is defined as the biomass of living material in an ecosystem at a particular time.

Standing state:

It is defined as the number or amount of inorganic nutrients present in an ecosystem.

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Priyanka Kumari

Which of the following is an ecosystem service provided by a natural ecosystem?

a. Cycling of nutrients
b. Prevention of soil erosion
c. Pollutant absorption and reduction of the threat of global warming
d. All of the above

The answer is the option (d) All of the above

Explanation: (d) All of the above are habitats provided by nature and natural ecosystem.

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infoexpert25

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Edaphic factor refers to:

a. Water
b. Soil
c. Relative humidity
d. Altitude

The answer is the option (b) Soil

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infoexpert25

The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:

a. Pelagic zone
b. Benthic zone
c. Lentic one
d. Littoral zone

The answer is the option (d) Littoral zone

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infoexpert25

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Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm

(a) Grassland
(b) Shrubby forest
(c) Desert
(d) Mangrove

The answer is the option (c) Desert

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infoexpert25

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

a. scavenger
b. tertiary producer
c. tertiary consumer
d. secondary consumer

The answer is the option (c) tertiary consumer

Explanation: The three species in sequence are primary consumer, secondary consumer and tertiary consumer.

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infoexpert25

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The reservoir for the gaseous type of bio-geochemical cycle exists in

a. stratosphere
b. atmosphere
c. ionosphere
d. lithosphere

The answer is the option (b) atmosphere

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infoexpert25

The sequence of communities of primary succession in water is:

a. phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees.

b. phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees.

c. free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees.

d. phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.

The answer is the option (d) phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow, and trees.

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Among the following biogeochemical cycles which one does not have losses due to respiration?

a. Phosphorus
b. Nitrogen
c. Sulphur
d. All of the above

The answer is the option (d) All of the above

Explanation: Losses due to respiration can be observed in case of carbon cycle.

 

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infoexpert25

A climax community is in a state of:

a. non-equilibrium
b. equilibrium
c. disorder
d. constant change.

The answer is the option (b) equilibrium

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infoexpert25

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