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प्रश्न
Distinguish between primary and secondary productivity.
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उत्तर
| Sr. No. | Primary productivity | Secondary productivity |
| 1. | The rate at which producers convert energy from photosynthesis and chemosynthesis into organic compounds is called primary productivity. It is measured per unit time and area. | When the rate of energy accumulation is measured at the consumer level, it is called secondary productivity. |
| 2. | It can be divided into gross and net primary productivity. | This productivity is not divided into gross and net. |
| 3. | In comparison, it is quite high. | It is comparatively small. |
| 4. | It is caused by the synthesis of new organic matter from inorganic raw materials. | It is caused by the synthesis of organic material from organic matter. |
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संबंधित प्रश्न
What is primary productivity?
How are productivity, gross productivity, net primary productivity and secondary productivity interrelated ?
What is primary productivity?
Why does primary productivity vary in different types of ecosystems?
State the relation between gross and net primary productivity.
What is the primary productivity of an ecosystem and how is it expressed?
Explain what does the equation given below show:
NPP = GPP – R
Answer the following question.
Describe the inter-relationship between productivity, gross primary productivity, and net productivity.
Write the relationship between productivity, gross primary productivity, net primary productivity, and secondary productivity.
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
If A = Gross primary productivity, B = Net primary productivity and C = Respiration losses, then what will be the correct relation between them?
Why are oceans least productive?
Justify the following statement in terms of ecosystem dynamics. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”.
Use the information provided in the table given below to answer the following questions:
| Tropic level | Net Production(KJm-2y-1) | Respiration (KJm-2y-1) |
| Top Carnivore | 50 | 35 |
| Carnivores | 420 | 378 |
| Herbivores | 4490 | 4041 |
| Producers | 45000 | 40,367 |
- Calculate the gross primary productivity.
- Analyze the trend in the Net Production from Producers to Top Carnivore. Give a reason for your observation.
In an ecosystem if the Net Primary Productivity (NPP) of first trophic level is 100x(kcal m−2) yr−1, what would be the GPP (Gross Primary Productivity) of the third trophic level of the same ecosystem?
Primary productivity in an ecosystem refers to the rate of generation of ______.
Which of the following best describes Net Primary Productivity (NPP)?
What is the relationship between Gross Primary Productivity (GPP) and Net Primary Productivity (NPP)?
In which standard units is productivity measured in terms of mass?
Which organismal category is responsible for producing primary productivity in ecosystems?
Which type of productivity involves the transfer and assimilation of organic matter across consumer trophic levels?
How does plant species composition affect ecosystem productivity?
Which human activity indirectly reduces ecosystem productivity?
