Multiple Choice QuestionsThe rate of formation of new organic matter by rabbit in a grassland is called
net productivity
secondary productivity
net primary productivity
net primary productivity
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
|
A |
B |
C |
D |
|
Rock Minerals |
Detritus |
Litter fall |
Producers |
|
A |
B |
C |
D |
|
Litter fall |
Producers | Rock minerals |
Detritus |
|
A |
B |
C |
D |
|
Detritus |
Rock minerals | Producer |
Litter fall
|
|
A |
B |
C |
D |
|
Detritus |
Rock minerals | Producer |
Litter fall
|
Given below is the representation of the extent of global diversity of invertebrates. What groups the four portions (A - D) represent respectively?
|
A |
B |
C |
D |
|
Insects |
Crustaceans |
other animal group |
Molluscs
|
|
A |
B |
C |
D |
|
Crustacean |
Insects | Molluscs | other animal groups |
|
A |
B |
C |
D |
|
Molluscs |
Other animal groups | Crustaceans | Insects |
|
A |
B |
C |
D |
|
Molluscs |
Other animal groups | Crustaceans | Insects |
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
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 |
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
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
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.
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