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WorksheetsEcosystem
Total questions: 20
Worksheet time: 19mins
The upright pyramid of number is absent in
Pond
Forest
Lake
Grassland
Secondary productivity is rate of formation of new organic matter by
Producer
Parasite
Consumer
Decomposer
Which one of the following is not a functional unit of an ecosystem?
Energy flow
Decomposition
Productivity
Stratification
The biomass available for consumption by the herbivores and the decomposers is called
Net primary productivity
Secondary productivity
Standing crop
Gross primary productivity
Which one of the following statement for pyramid of energy is incorrect whereas the remaining three are correct?
It show energy content of different trophic level of organisms.
It is inverted in shape.
It is upright in shape.
Its base is broad.
Identify the possible link 'B' in the following food chain:
Plant ⟶ Insect → 'B' → Eagle
Lion
Frog
Peacock
Human
Natural reservoir of phophorus is
Rock
Fossils
Sea water
Animal bones
Of the total incident solar radiation the proportion of PAR is
about 70%
about 50%
about 60%
about 80%
Which one of the following pair is mismatached?
Biomass burning - Release of CO2
Fossil fuel burning - Release of CO2
Nuclear power - Radioactive waste
Solar energy - Green house effect
Which one of the following is not used for constructing of ecological pyramids?
Dry weight
Number of individuals
Rate of energy flow
Fresh weight
The maximum bio magnification would be in which of the following in case of aquatic ecosystem?
Fishes
Phytoplanktons
Birds
Zooplanktons
Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?
Less than 1%
2-10%
30%
50%
During the process of ecological succession the changes that take place in communities are
Orderly and sequential
Random
Very quick
Not influenced by the physical environment
The sequence of communities of primary succession in water is
Phytoplankton, sedges, free-floating hydrophytes, rooted hydrophytes, grasses and trees
Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees
Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees
Phytoplankton, rooted submerged hydrophytes, floating
The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called
Pelagic zone
Benthic zone
Littoral zone
Lentic zone
Which of the following is NOT a denitrifying bacteria
Thiobacillus
Psuedomonas aeruginosa
Thiobacillus dinitrificans
Bacillus ramosus
Ecosystem is smallest unit of
Biosphere
Lithosphere
Mesosphere
Ionosphere
Succulent plant grows in
Tundra
Desserts
Tropical rain forests
Temperate deciduous forests
The nature's cleaner are
Producers
Consumers
Decomposers and scavengers
Symbionts
Trophic level in ecosystem is formed by
only plants
only herbivores
Only bacteria
organisms linked in food chain
