Q. No.
Given below is a simplified model of phosphorus cycling in a terrestrial ecosystem with four blanks (A-D). Identify the blanks.
| A | B | C | D | |
| 1. | Rock minerals | Detritus | Litter fall | Producers |
| 2. | Litter | Producers | Rock minerals | Detritus |
| 3. | Detritus | Rock minerals | Producers | Litter fall |
| 4 | Producers | Litter fall | Rock minerals | Detritus |
Which one of the following is not a gaseous biogeochemical cycle in the ecosystem?
1. Sulphur cycle
2. Phosphorus cycle
3. Nitrogen cycle
4. Carbon cycle
Which one of the following statements is correct for secondary succession?
| 1. | It occurs on a deforested site |
| 2. | It follows primary succession |
| 3. | It is similar to primary succession except that it has a relatively slow pace |
| 4. | All of the above |
The correct sequence of plants in a Hydrosphere is:
| 1. | Oak → Lantana → Scirpus → Pistia → Hydrilla → Volvox |
| 2. | Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak |
| 3. | Pistia → Volvox → Scirpus → Hydrilla → Oak → Lantana |
| 4. | Oak → Lantana → Volvox → Hydrilla → Pistia → Scirpus |
| 1. | grasslands | 2. | agro-ecosystems |
| 3. | oceans | 4. | forests |
Match the following and select the correct option:
| Column I | Column II | ||
| (a) | Earthworm | (i) | Pioneer species |
| (b) | Succession | (ii) | Detrivore |
| (c) | Ecosystem service | (iii) | Natality |
| (d) | Population growth | (iv) | Pollination |
1. A-(i), B-(ii), C-(iii), D-(iv)
2. A-(i), B-(ii), C-(iii), D-(iv)
3. A-(iii), B-(ii), C-(iv), D-(i)
4. A-(ii), B-(i), C-(iv), D-(iii)
Secondary succession takes place on/in:
2. degraded forest
3. newly created pond
4. newly cooled lava
During ecological succession:
| 1. | gradual and predictable change in the composition of species occurs in a given area. |
| 2. | establishment of a new biotic community is very fast in its primary phase. |
| 3. | the number and types of animals are constant. |
| 4. | changes lead to a community that is in equilibrium with the environment and is called a pioneer community. |
In which of the following, do both pairs have the correct combination?
| 1. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Carbon and nitrogen Sulphur and phosphorous |
| 2. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Carbon and sulphur Nitrogen and phosphorus |
| 3. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Nitrogen and sulphur Carbon and phosphorous |
| 4. | Gaseous nutrient cycle Sedimentary nutrient cycle |
Sulphur and phosphorous Carbon and nitrogen |
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