The producers in aquatic ecosystems include all except:
1. | cyanobacteria | 2. | algae |
3. | plants | 4. | zooplankton |
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
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 |
An inverted pyramid of biomass can be found in which ecosystem?
1. | Forest | 2. | Marine |
3. | Grassland | 4. | Tundra |
Which of the following is not a producer?
1. | Spirogyra | 2. | Agaricus |
3. | Volvox | 4. | Nostoc |
Which of the following ecosystems is most productive in terms of net primary production?
1. | Deserts | 2. | Tropical rainforests |
3. | Oceans | 4. | Estuaries |
Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
1. | Less than 1% | 2. | 2-10 % |
3. | 30 % | 4. | 50 % |
How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
1. | 1% | 2. | 10% |
3. | 40% | 4. | 90% |
Among the following bio-geo-chemical cycles, which one does not have losses due to respiration?
1. Phosphorus
2. Nitrogen
3. Sulphur
4. All of the above