Q. No.Consider the following statements:
I:
In an aquatic ecosystem, Grazing Food Chain (GFC) is the major conduit for energy flow.
II:
In a terrestrial ecosystem, Detritus Food Chain (DFC) is the major conduit for energy flow.
III:
GFC and DFC are not interconnected at any level.
Which of the above statements are true?
1.
I and II only
2.
I and III only
3.
II and III only
4.
I, II, and III
Consider the following statements:
| I: | Trophic level in an ecosystem represents a functional level, not a species as such. |
| II: | Saprophytes are accorded the position of a top consumer in an ecosystem. |
| III: | A species can occupy more than one trophic level in the same ecosystem at the same time. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Given below is a hypothetical pyramid of energy. The amount of energy left at the level of secondary consumers would approximately be:
| 1. | 10000 J | 2. | 1000 J |
| 3. | 100 J | 4. | 50 J |
Consider the following statements:
| I: | The rate of production of organic matter during photosynthesis is called as gross primary productivity of an ecosystem. |
| II: | The available biomass for the consumption of heterotrophs is called secondary productivity. |
| III: | The low productivity of the oceans can mainly be attributed to the limited availability of nitrogen. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Which of the following group of organisms is not included in the ecological pyramids?
1. Herbivores
2. Carnivores
3. Saprophytes
4. Predators
Why does the pyramid of energy always upright?
1. Because energy cannot be destroyed.
2. Smaller organisms have more potential energy than larger ones
3. Because when energy flows from a particular trophic level to the next trophic level, some energy is always lost as heat at each step.
4. More than one statement is correct.
The pyramid of biomass in the sea is generally
1. Upright
2. Inverted
3. Bell-shaped
4. Rectangular, stable.
Which of the following statement is incorrect?
| 1. | Any calculations of energy content, biomass or numbers, has to include all organisms at that trophic level. |
| 2. | The base of each pyramid represents the producers or the first trophic level while the apex represents tertiary or top level consumer. |
| 3. | The trophic level represents a functional level, not a species as such. |
| 4. | A given species occupies only one trophic level in the same ecosystem at the same time. |
If the available energy at first trophic level is 10000 J then how much trophic levels it could support further?
1. 2
2. 3
3. 4
4. 5
Which of the following statement is incorrect?
| 1. | Only three top-carnivores are supported in an ecosystem based on production of nearly 6 million plants. |
| 2. | Pyramid of biomass shows a sharp increase in biomass at higher trophic levels. |
| 3. | Pyramid of biomass is inverted if small standing crop of phytoplankton supports large standing crop of zooplankton. |
| 4. | Pyramid of energy is always upright. |
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