Q. No.Energy and nutrients enter an ecosystem and hence in a community through:
1. Producers
2. Consumers
3. Detritivores
4. Apex predators
1. Producers
2. Consumers
3. Detritivores
4. Apex predators
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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 |
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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
Identify the incorrectly matched pair:
1. Carnivores -- secondary or tertiary consumer
2. Decomposers -- microbial heterotrophs
3. Herbivores -- primary consumer
4. Omnivores -- molds, yeasts and mushrooms
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Decomposers like fungi and bacteria are :
| i. | Autotrophs |
| ii. | Heterotrophs |
| iii. | Saptrotrophs |
| iv. | Chemo-autotrophs |
Choose the correct answer :
| 1. | i and ii | 2. | i and iv |
| 3. | ii and iii | 4. | i and iii |
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The process of mineralization by micro-organisms helps in the release of:
| 1. | Inorganic nutrients from humus |
| 2. | Both organic and inorganic nutrients from detritus |
| 3. | Organic nutrients from humus |
| 4. | Inorganic nutrients from detritus and formation of humus |
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Productivity is the rate of production of biomass expressed in terms of :
i.
ii.
iii.
iv.
| 1. | ii | 2. | iii |
| 3. | ii and iv | 4. | i and iii |
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