Identify the incorrectly matched pair:
1. |
Vertical distribution of different species occupying different levels |
Stratification |
2. |
Mass of living material at a particular time at each trophic level |
Standing crop |
3. |
Rate of formation of new organic matter by consumers |
Net primary productivity |
4. |
The rate of production of organic matter during photosynthesis |
Gross primary productivity |
The productivity in an aquatic ecosystem is least likely to be limited by:
1. | nitrogen | 2. | carbon |
3. | phosphorus | 4. | iron |
Which of the following is most likely to exhibit the maximum difference between GPP and NPP?
1. phytoplankton in the ocean.
2. corn plants in a farmerʹs field.
3. prairie grasses.
4. an oak tree in a forest.
Unlike terrestrial ecosystems, the majority of primary production in the ocean is:
1. | not dependent on the Sun as the source of energy |
2. | performed by phytoplankton |
3. | not limited by the availability of nitrogen |
4. | not important from a global perspective |
Which of the following ecosystems is most productive in terms of net primary production?
1. | Deserts | 2. | Tropical rainforests |
3. | Oceans | 4. | Estuaries |
The rate of formation of new organic matter by consumers in an ecosystem is known as:
1. | Gross Primary productivity |
2. | Net Primary productivity |
3. | Secondary productivity |
4. | Non-productivity |
A herbivore eats 4,000 J of plant material. 2200 J is indigestible and is eliminated as feces. 1,600 J are used in cellular respiration. What is the approximate production efficiency of this animal?
1. | 1% | 2. | 5% |
3. | 10% | 4. | 50% |
The generation of biomass of heterotrophic (consumer) organisms in a system is termed:
1. | biogeochemical cycles | 2. | net primary productivity |
3. | gross primary productivity | 4. | secondary productivity |
Consider the following statements:
I: | The rate of production of organic matter during photosynthesis is called as gross primary productivity of an ecosystem. |
II: | The available biomass for the consumption of heterotrophs is called secondary productivity. |
III: | The low productivity of the oceans can mainly be attributed to the limited availability of nitrogen. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
What is the best description of trophic efficiency?
1. | the ratio of net secondary production to the assimilation of primary production. |
2. | the percentage of production transferred from one trophic level to the next. |
3. | a measure of how nutrients are cycled from one trophic level to the next. |
4. | usually greater than production efficiencies. |