At the trophic level of consumers, the rate at which food energy is assimilated, is called:
1. Secondary productivity
2. Gross primary productivity
3. Net primary productivity
4. None of these
Net primary productivity is the gross primary productivity minus
1. that which is consumed by herbivores
2. that which is consumed by producer in metabolism
3. secondary productivity
4. loss due to mortality
Consider the following two statements:
l. | The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. |
ll. | Majority of this is contributed by the oceans as they occupy larger area of earth. |
1. Both l and ll are correct and ll explains l
2. Both l and ll are correct but ll does not explain l
3. l is correct but ll is incorrect
4. l is incorrect but ll is correct
The rate of formation of new organic matter by consumers is called as:
1. Secondary productivity
2. Standing crop
3. Standing state
4. Net primary productivity
The mass of living material at a tropic level at a particular time is called
1. Gross primary productivity
2. Standing state
3. Net primary productivity
4. standing crop
Secondary productivity is rate of formation of new organic matter by
1. producer
2. parasite
3. consumer
4. decomposer
The biomass available for consumption by the herbivores and the decomposers is called
1. net primary productivity
2. secondary productivity
3. standing crop
4. gross primary productivity
Which of the following ecosystem types has the highest annual net primary productivity ?
1. Tropical rain forest
2. Tropical deciduous forest
3. Temperate evergeen forest
4. Temperate deciduous forest
Which of the following changes would not result in an increase in net primary production?
(1) Increased precipitation in an and area
(2) Increased soil fertility
(3) Increased latitude (moving from the equator toward the poles)
(4) Moving down a mountain to warmer temperatures
The amount of energy reaching an upper trophic level is determined by:
1. Net primary production
2. Net primary production and the efficiencies with which food energy is converted to biomass
3. Gross primary production
4. Gross primary production and the efficiencies with which food energy is converted to biomass