Advertisements
Advertisements
प्रश्न
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”.
Advertisements
उत्तर
Rate of production of organic matter in an ecosystem is called Gross Primary Productivity (GPP). When we subtract the respiratory losses (R) from GPP, we get Net Primary Productivity (NPP).
Nature provides various biotic and abiotic factors to enhance the rate of Gross Primary Productivity. Hence, it can be said that nature tends to increase the gross primary productivity.
But human beings need to make optimum utilization of the biomass produced. This is achieved in various ways; like harvesting the crop at the right time and plucking the fruits at the right time. If fruits will be left on the tree for a longer time, it will result in higher respiratory losses. A higher respiratory loss will reduce NPP. By plucking the fruits at the right time, man tries to increase the net primary productivity.
APPEARS IN
संबंधित प्रश्न
Answer the following question.
Describe the inter-relationship between productivity, gross primary productivity, and net productivity.
Which one of the following ecosystem is most productive in term of net primary production?
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
Which of the following ecosystems is most productive in terms of net primary production?
Which of the following ecosystems will be more productive in terms of primary productivity? Justify your answer. A young forest, a natural old forest, a shallow polluted lake, alpine meadow.
The primary productivity in an ecosystem is expressed as ______.
- gm-2 yr-1
- gm-2 yr
- Kcal m-2 yr-1
- Kcal m-2
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.
What is the rate at which biomass is synthesised by a trophic level per unit area per unit time called?
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 of the following is a limiting factor for productivity in terrestrial ecosystems?
Which nutrient is essential for enzyme synthesis and chlorophyll production in plants?
Which human activity indirectly reduces ecosystem productivity?
Why is CO₂ concentration considered a factor affecting productivity?
Which of the following correctly represents the energy flow in an ecosystem based on productivity concepts?
