Q. No.Consider the following statements:
The rate of decomposition is high if:
I:
The detritus is rich in lignin and chitin.
II:
The detritus is rich in nitrogen and sugars.
III:
The environmental conditions are warm and moist.
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
The rate of decomposition is high if:
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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 |
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Consider the following statements:
| I: | The atmosphere only contains about 1% of total global carbon. |
| II: | Unlike the carbon cycle, there is no respiratory release of phosphorus into the atmosphere. |
| III: | Sulphur and phosphorus cycles are sedimentary cycles. |
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
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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 |
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Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?
| 1. | Level PC is "insects" and level SC is "small insectivorous birds". |
| 2. | Level PP is "phytoplanktons" in sea and "Whale" on top level TC |
| 3. | Level PP is "pipal trees" and level SC is "sheep". |
| 4. | Level PC is "rats" and level SC is "cats". |
The accompanying figure represents an ecological pyramid. It is
| 1. | Pyramid of numbers in a grassland |
| 2. | Pyramid of biomass in a fallow land |
| 3. | Pyramid of biomass in a lake |
| 4. | Energy pyramid in a spring |
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A physical structure that is characteristic of each type of ecosystem is due to:
| 1. | Interaction between various biotic components of the ecosystem |
| 2. | Interaction between various abiotic components of the ecosystem |
| 3. | Interaction between various biotic and abiotic components of the ecosystem |
| 4. | Interaction of producers with abiotic components of the ecosystem |
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Stratification of an ecosystem means:
| 1. | Vertical distribution of different species occupying different levels |
| 2. | Vertical distribution of different species occupying the same levels |
| 3. | Horizontal distribution of different species occupying different levels |
| 4. | Horizontal distribution of different species occupying the same levels |
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The rate of formation of new organic matter by consumers in an ecosystem is known as:
1. Gross Primary productivity
2. Net Primary productivity
3. Secondary productivity
4. Non-productivity
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Organisms that are capable of conversion of inorganic material into organic material with the help of the radiant energy of the sun include:
| I: | Plants |
| II: | Photosynthetic bacteria |
| III: | Chemosynthetic bacteria |
| 1. | I only | 2. | I and II only |
| 3. | I and III only | 4. | I, II, and III |
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