Q. No.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
Most animals are tree dwellers in a:
2. thorn woodland
3. temperate deciduous forest
4. tropical rainforest
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 |
Pheretima and its close relatives derive nourishment from:
1. Sugarcane roots
2. Decaying fallen leaves and soil organic matter
3. Soil insects
4. Small pieces of fresh fallen leaves of maize
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 |
1. mangroves
2. tropical rainforests
3. alpine forests
4. temperate forests
1. temperate deciduous forests
2. alpine forests
3. scrub forests
4. tropical rain forests
Stability of ecosystem depends upon:
1. Primary
2. Interchange between producers and consumers
3. Number of producers
4. Number of consumers
Intermediate community between pioneer and climax communities is called:
1. seral community
2. biotic community
3. temporary community
4. ecosure
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