The function of a reservoir of nutrient cycle is to:
1. synthesize minerals
2. transfer minerals to other ecosystems
3. meet any deficit
4. destroy the unwanted minerals
The dry weight of living organisms is mainly made up of:
1. | Water | 2. | Calcium |
3. | Nitrogen | 4. | Carbon |
The maximum percent of total global carbon is found:
1. in fossil fuels
2. in atmosphere
3. dissolved in oceans
4. in biomass of microbes
The amount of carbon dioxide in the atmosphere is regulated mainly by:
1. the atmosphere itself
2. human activities
3. decomposition by microbes
4. the oceanic reservoir
Carbon dioxide is returned to the atmosphere by all the following except:
1. photosynthesis by the primary producers
2. respiratory activities of producers and consumers
3. decomposers
4. volcanic activity
Regarding phosphorus cycle:
I: | There is no respiratory release of phosphorus into atmosphere |
II: | Atmospheric inputs of phosphorus through rainfall of phosphorus is small |
1. Only I is true.
2. Only II is true.
3. Both I and II are true.
4. Both I and II are false.
The price tag put by researchers on the annual ecosystem services is about:
1. USD 11 trillion
2. USD 22 trillion
3. USD 33 trillion
4. USD 44 trillion
Identify the incorrectly matched pair:
Ecosystem service |
Cost out of total [%] |
|
1. |
Soil formation |
50 |
2. |
Nutrient cycling |
10 |
3. |
Climate regulation |
6 |
4. |
Habitat for wildlife |
3 |
Identify the incorrectly matched pair:
1. Carnivores -- secondary or tertiary consumer
2. Decomposers -- microbial heterotrophs
3. Herbivores -- primary consumer
4. Omnivores -- molds, yeasts and mushrooms
The process of mineralization by micro-organisms helps in the release of:
1. | Inorganic nutrients from humus |
2. | Both organic and inorganic nutrients from detritus |
3. | Organic nutrients from humus |
4. | Inorganic nutrients from detritus and formation of humus |