Q. No.Aquatic ecosystems that are most adversely affected by acid are those that lack:
1. calcium
2. carbonic acid
3. nitrate
4. bicarbonate
1. calcium
2. carbonic acid
3. nitrate
4. bicarbonate
The largest net primary production of the Earth is contributed by:
1. savanna
2. salt marsh
3. open ocean
4. tropical rainforest
An example of primary succession would be:
| 1. | Soil formation in the crater of an extinct volcano |
| 2. | Growth of a pine forest after a fire |
| 3. | Restoration of grass on a former agricultural field |
| 4. | Starfish colonizing on a coral reef |
The residual, after autotrophic respiration is subtracted from GPP, is:
| 1. | secondary productivity | 2. | net primary productivity |
| 3. | standing crop biomass | 4. | chemosynthesis |
Energy and nutrients enter an ecosystem and hence in a community through:
1. Producers
2. Consumers
3. Detritivores
4. Apex predators
The prime driving force for the water cycle is:
| 1. | evapotranspiration from plants |
| 2. | rainfall |
| 3. | snowmelt |
| 4. | percolation of water through the soil |
The producers in aquatic ecosystems include all except:
| 1. | cyanobacteria | 2. | algae |
| 3. | plants | 4. | zooplankton |
Early seral communities in secondary succession are less productive than in later stages because:
| 1. | early seral communities are prone to invasion and disturbance by other species of plants |
| 2. | low biomass means less productivity |
| 3. | weedy early seral communities make habitat inhospitable for more productive species |
| 4. | early seral stages are more sensitive to nutrient deficiencies |
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.
Primary producers near deep-sea vents are:
1. Chemohetrotrophic prokaryotes
2. Chemoauotrophic prokaryotes
3. Photosynthetic prokaryotes
4. Photosynthetic autotrophs
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