Q. No.Identify the correct statements:
I:
Only a few individuals can be taken into account at any trophic level and the deductions may be generalised.
II:
Trophic level is a functional level and does not represent a species.
III:
A given species may occupy more than one trophic level in the same ecosystem at the same time.
1.
Only I and II
2.
Only I and III
3.
Only II and III
4.
I, II, III and IV
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The pyramid of biomass in the sea is generally inverted because:
| 1. | the biomass of fish far exceeds that of phytoplankton at any given time |
| 2. | the major primary production to the sea is actually contributed by the terrestrial ecosystems |
| 3. | the flow of energy level does not follow the laws of thermodynamics in the sea |
| 4. | It is not true. The pyramid of biomass can never be inverted in any ecosystem |
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Which of the following pyramids can never be inverted in any ecosystem?
1. Pyramid of numbers
2. Pyramid of biomass
3. Pyramid of energy
4. All ecological pyramids can be inverted
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In an ecological pyramid, the saprotrophs:
1. are primary producers
2. can be at any trophic level
3. are not given any place
4. are kept with apex predators
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Ecological succession is:
1. gradual and predictable
2. gradual and unpredictable
3. sudden and predictable
4. sudden and unpredictable
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The entire sequence of communities that successively change in a given area are called:
1. Taxa
2. Seres
3. Pioneers
4. Climax
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Ecological succession has paralleled:
1. Glaciations
2. Mass extinctions
3. Genetic drifts
4. Evolution
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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
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Identify the correct statements regarding ecological succession:
| I: | Usually, secondary succession is faster than primary succession. |
| II: | Ecological succession involves a change over time in vegetation only. |
| III: | Natural or human disturbance can convert a particular seral stage of succession to an earlier stage. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
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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
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