Q. No.The correct sequence of seral stages in primary hydrarch succession [pioneer to climax] would be:
1.
Phytoplankton, Submerged plant stage, Submerged free floating plant stage, Reed swamp stage, Marsh-meadow stage, Scrub stage, Forest
2.
Phytoplankton, Submerged free floating plant stage, Submerged plant stage, Reed swamp stage, Marsh-meadow stage, Scrub stage, Forest
3.
Phytoplankton, Submerged plant stage, Submerged free floating plant stage, Marsh-meadow stage, Reed swamp stage, Scrub stage, Forest
4.
Phytoplankton, Reed swamp stage, Marsh-meadow stage, Submerged plant stage, Submerged free floating plant stage, Scrub stage, Forest
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The amount of nutrients present in the soil, at any given time, is referred to as:
1. Standing state
2. Standing crop
3. Primary productivity
4. Secondary productivity
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The reservoir is located in the Earth’s crust for:
I. Gaseous type of nutrient cycle
II. Sedimentary nutrient cycle
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
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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
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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
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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.
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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 |
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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
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Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
| 1. | ii | 2. | iii |
| 3. | ii and iv | 4. | i and iii |
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Pyramid of numbers is :
1. Always upright
2. Always inverted
3. Either upright or inverted
4. Neither upright nor inverted
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