In an ecosystem the rate of production of organic matter during photosynthesis is termed as
net primary productivity
gross primary productivity
secondary productivity
secondary productivity
B.
gross primary productivity
The rate of production of organic matter (chemical energy) as biomass that primary producers (via photosynthesis) created in a given duration of time is called Gross Primary Productivity (GPP).
Net primary production is the rate at which all plants (producers) in an ecosystem produces net useful chemical energy, it is equal to difference between the rate at which plants in an ecosystem produce useful chemical energy (GPP) and the rate at which they use some of that energy during respiration.
NPP = GPP - respiration (by plants)
Secondary productivity is the generation of biomass or organic matter by heterotrophic (consumers) in a system.
Net productivity is the amount of energy trapped in organic matter during a specific interval at a given trophic levels less than that lost by the respiration of the organisms at that level.
The mass of living material at a tropic level at a particular time is called
gross primary productivity
standing state
net primary productivity
net primary productivity
Identify the likely organisms (a), (b) (c) and (d) in the food web shown below
| (I) | (II) | (III) | (IV) |
| deer | rabbit | frog | rat |
| (I) | (II) | (III) | (IV) |
| dog | squirrel | bat | deer |
| (I) | (II) | (III) | (IV) |
| rat | dog | tortoise | crow |
| (I) | (II) | (III) | (IV) |
| rat | dog | tortoise | crow |
Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?
Sparrow
Lion
Goat
Goat
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
It shows energy content of different trophic level organisms
It is inverted in shape
It is upright in shape
It is upright in shape
Vertical distribution of different species occupying different levels in a biotic community is known as
divergence
stratification
zonation
zonation
Secondary succession takes place on/in
bara rock
degraded forest
newly created pond
newly created pond
Which one of the following statements is correct for secondary succession?
It occurs on a deforested site
It follows primary succession
It is similar to primary succession except that it has a relatively fast pace
It is similar to primary succession except that it has a relatively fast pace
If 20 J of energy is trapped at the producer level, then how much energy will be available to peacock as food in the following chain?
Plant--> Mice --> Snake --> Peacock
0.02 J
0.002 J
0.2 J
0.2 J
Of the total incident solar radiation, the proportion of PAR is
about 60%
less than 50%
more than 80%
more than 80%
