In a terrestrial ecosystem, a much larger fraction of energy flows through the:
1. | DFC | 2. | GFC |
3. | Either of DFC or GFC | 4. | Nither of DFC nor GFC |
In an aquatic food chain, zooplankton occupy which trophic level?
1. | First | 2. | Second |
3. | Third | 4. | Fourth |
Each trophic level has a certain mass of living material at a particular time, best called as:
1. | Biomass | 2. | Standing state |
3. | Standing crop | 4. | Gross productivity |
Approximately, what percent of energy is transferred to each trophic level from the lower trophic level in an ecosystem?
1. | 1 | 2. | 10 |
3. | 50 | 4. | 90 |
The entire sequence of communities that successively change in a given area are called:
1. Taxa
2. Seres
3. Pioneers
4. Climax
In which of the following instances would an ecological succession regarded as secondary?
1. Newly cooled lava
2. Bare rock
3. Newly created pond
4. Abandoned farmland
Ecological succession leads to mesic conditions in:
I: | Hydrarch succession |
II: | Xerarch succession |
1. Both I and II
2. Only I
3. Only II
4. Neither I nor II
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 |
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
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