Q. No.Pneumatophores occur in
1. Halophytes
2. Submerged hydrophytes
3. Carnivorous plants
4. Free-floating hydrophytes
1. Halophytes
2. Submerged hydrophytes
3. Carnivorous plants
4. Free-floating hydrophytes
Great Barrier Reef along east coast of Australia is a
1. Population
2. Community
3. Biome
4. Ecosystem
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 |
In an ecosystem, the rate of production of organic matter during photosynthesis is called as its:
| 1. | Gross Primary productivity |
| 2. | Net Primary productivity |
| 3. | Secondary productivity |
| 4. | Non productivity |
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 |
The annual net primary productivity of whole biosphere is approximately:
| 1. | 25 billion tons | 2. | 55 billion tons |
| 3. | 70 billion tons | 4. | 170 billion tons |
By process of leaching during decomposition of detritus, water soluble :
| 1. | organic nutrients go down the soil horizon and get precipitated as available salts |
| 2. | inorganic nutrients go down the soil horizon and get precipitated as unavailable salts |
| 3. | organic nutrients go down the soil horizon and get precipitated as available salts |
| 4. | inorganic nutrients go down the soil horizon and get precipitated as available salts |
During decomposition of detritus, the step that is performed by bacteria and fungi includes:
1. Catabolism only
2. Catabolism and fragmentation
3. Leaching and catabolism
4. Fragmentation, Leaching and Catabolism
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