Q. No.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
Sedimentary nutrient cycle
Sulphur and phosphorous
Sedimentary nutrient cycle
Nitrogen and phosphorus
Sedimentary nutrient cycle
Carbon and phosphorous
Sedimentary nutrient cycle
Carbon and nitrogen
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. |
The vertical distribution of different species occupying different levels in a biotic community is known as:
2. stratification
3. zonation
4. pyramid
Secondary succession takes place on/in:
2. degraded forest
3. newly created pond
4. newly cooled lava
The mass of living material at a tropic level at a particular time is called:
2. standing state
3. net primary productivity
4. standing crop
In an ecosystem, the rate of production of organic matter during photosynthesis is termed as:
1. net primary productivity
2. gross primary productivity
3. secondary productivity
4. net productivity
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)
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 |
If 20 J of energy is trapped at the producer level, then how much energy will be available to peacocks as food in the following chain?
Plant → mice → snake → peacock
| 1. | 0.02 J | 2. | 0.002 J |
| 3. | 0.2 J | 4. | 0.0002 J |
© 2024 GoodEd Technologies Pvt. Ltd.