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प्रश्न
Why are oceans least productive?
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उत्तर
Oceans are the least productive because
- There is insufficient radiation as sunlight decreases with the increasing depth of the ocean.
- Oceans are nitrogen deficient which is an important nutrient for plants.
- Conditions oi high salinity which is not favourable for all plants.
- There is no substratum to support plants.
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संबंधित प्रश्न
Distinguish between primary and secondary productivity.
Why does primary productivity vary in different types of ecosystems?
What is the primary productivity of an ecosystem and how is it expressed?
How much of the net primary productively of a terrestrial ecosystem is eaten and digested by herbivores?
In the equation GPP − R = NPP R represents ______
Which of the following ecosystems is most productive in terms of net primary production?
Why is the rate of assimilation of energy at the herbivore level called secondary productivity?
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”.
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?
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?
Which nutrient is essential for enzyme synthesis and chlorophyll production in plants?
How does plant species composition affect ecosystem productivity?
Which human activity indirectly reduces ecosystem productivity?
Which of the following correctly represents the energy flow in an ecosystem based on productivity concepts?
