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
A.
It occurs on a deforested site
Secondary succession or subsere is ecological succession that takes place in a recently denuded area which still contains a lot of organic debris, remains and propagules of previously living organisms. It is a more common and caused by baring of an area due to forest fires, deforestation, excessive overgrazing, landslides, earthquakes, repeated floods, etc. Only 50 to 100 years are required for establishment of a grassland over a recently denuded area. Formation of forest requires 100 to 200 years.
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
Secondary succession takes place on/in
bara rock
degraded forest
newly created pond
newly created pond
Vertical distribution of different species occupying different levels in a biotic community is known as
divergence
stratification
zonation
zonation
Of the total incident solar radiation, the proportion of PAR is
about 60%
less than 50%
more than 80%
more than 80%
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
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
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
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 |
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
