Q. No.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
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 |
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 |
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 |
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 |
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 |
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 |
The nutrients in an ecosystem are:
| 1. | continuously lost from an ecosystem |
| 2. | needed as a continuous supply from the outside |
| 3. | recycled time and again indefinitely |
| 4. | continuously synthesized by physical forces |
The earth is regarded as “open” system with respect to:
| 1. | organisms | 2. | chemicals |
| 3. | energy | 4. | water |
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