1) The term 'bio-coenosis' was coined by: a. Tansley b. Warming c. Carl Mobius d. S.C.Pandya
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2) Biotic components of an ecosystem include: a. Producers only b. Consumers only c. Producers and Consumers only d. Producers, consumers and decomposers
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3) Which is the most stable ecosystem? a. Mountain b. Desert c. Forest d. Ocean
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4) The greatest biomass of autotrophs in the world's oceans is that of: a. Benthic brown algae, coastal red algae and dephnids b. Benthic diatoms and marine viruses c. Sea-grasses and slime-moulds d. Free-floating microalgae, cyanobacteria and nanoplankton
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5) Which are the biotic components of forest ecosystem? a. Producers b. Decomposers c. Consumers d. All of the above
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6) Energy enters into the ecosystem through: a. Herbivores b. Carnivores c. Producers d. Decomposers
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7) The part of earth in which life exists is known as: a. Lithosphere b. Biosphere c. Atmosphere d. Hydrosphere
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8) Which ecosystem has the highest primary productivity? a. Pond ecosystem b. Lake ecosystem c. Grassland ecosystem d. Forest ecosystem
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9) In food chain, herbivores are: a. Producer b. Primary consumer c. Secondary consumers d. Decomposers
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10) In an upright pyramid of biomass, the herbivores occupy the position: a. 4 b. 2 c. 3 d. 1
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11) The flora and fauna in lakes and ponds represents: a. Lentic biota b. Lentic biota c. Abiotic d. None of these
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12) Relative biological effectiveness (RBE) is usually referred to damages caused by: a. Pollution b. High temperature c. Low temperature d. Radiation
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13) If phytoplanktons are destroyed from sea, then: a. Algae will get more grow luxuriantly b. Primary consumers will grow c. Food chain will be effected d. No effect will be seen
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14) When the number of organisms at successive levels are plotted, they assume the space of a pyramid. This is called the pyramid of: a. Energy b. Number c. Biomass d. Both (a) and (c)
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15) Ten per cent law of energy transfer, in a food chain was enunciated by: a. Elton b. Heackel c. Lindeman d. Schimper
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16) Which part of the pond ecosystem does not affect by the temperature: a. Epilimnion b. Metalimnion c. Hypolimnion d. All of the above
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17) The rate of storage of food energy at consumer level is called: a. Secondary productivity b. Primary productivity c. Gross productivity d. Net productivity
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18) Which of the following is an artificial ecosystem? a. Rice-field b. Forest c. Grassland d. Lake
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19) Source of energy in an ecosystem is: a. Sun b. ATP c. Sugar made by plant d. Green plant
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20) Savannahs are: a. Topical rain forest b. Desert c. Grassland with scattered trees d. Dense forect with close canopy
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21) Peacock eats a snake and snake eats frog and frog eats insect while insect eats green plant, then position of peacock is: a. Primary producer b. Secondary Producer c. Decomposer d. Apex of food pyramids
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22) A food chain has the following trophic levels: a. 3 or 4 b. 3 c. 2 d. 1
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23) In a comparative study of grassland ecosystem and pond ecosystem it may be observed that: a. Primary and secondary consumers are similar b. Both biotic and abiotic components are different c. The biotic components are almost similar d. The abiotic components are almost similar
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24) Mr. X is eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying: a. First trophic level b. Second trophic level c. Third trophic level d. Fourth trophic level
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25) This is an inverted pyramid: a. Pyramid of numbers in a grassland ecosystem b. Pyramid of energy in a pond ecosystem c. Pyramid of biomass in a grassland ecosystem d. Pyramid of biomass in a pond ecosystem
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26) In food chain initial organisms are: a. Top consumers b. Secondary consumers c. Primary consumers d. Photo synthesizers
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27) If bamboo plant is growing in a far forest then what will be its trophic level? a. First b. Second c. Third d. Fourth
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28) Which type of the following ecological pyramids are never inverted? a. Pyramids of number b. Pyramids of energy c. Pyramids of biomass d. Pyramids of dry biomass
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29) Which of the following food chain may not be directly dependent upon solar energy? a. Grazing b. Detritus c. Soaking d. Depleting
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30) Carbon cycle includes: a. Producer, consumer, decomposer b. Producer, consumer, producer c. Producer , decomposer, consumer d. Consumer, producer, decomposer
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31) Azolla is used as a biofertilizer because it: a. Multiplies very fast to produce massive biomass b. Has association of nitrogen-fixing Rhizobium c. Has association nitrogen fixing Cyanobacteria d. Has association of mycorrhiza
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32) Plants like Saccharum. Imperata, Capparis and Acacia occur in the following biome: a. Temperatr grassland b. Tropical savannah c. Tropical rain forest d. Desert
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33) During anaerobic digestion of organic waste, such as in producing biogas, which of the following is left undergraded? a. Lignin b. Lipids c. Cellulose d. Hemi-cellulose
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34) Nektons are: a. Organisms that swim in water b. Floating plants c. Suspended lower plants d. Animals associated with plants e. Algae
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35) The temperate broad-leaf forest biomes are characterized by the predominance of a. Cupressus sp. b. Dalbergia sp. c. Diospyros sp. d. Quercus sp.
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36) These belong to the category of primary consumers: a. Snakes and frogs b. Water insects c. Eagle and snakes d. Insects and cattle
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37) The plants of Cupressus and Cedrus are characteristic of: a. Temperate broad-leaf forest b. Temperate coniferous forest c. Chaparral d. Desert
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38) The moist tropical deciduous forest biomes show predominace of plants like: a. Larix and Abies b. Zizyphus and Butea c. Shorea and Tectona d. All of these
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39) Buttresses are usually found in the plants growing in: a. Tropical deciduous forests b. Temperate coniferous forests c. Temperate broad-leaf forest d. Tropical rain forest
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40) In a biome the life form of climatic climax vegetation is: a. Uniform b. Variable c. Absent d. Unpredictable
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41) The fungi in a forest ecosystem act as: a. Macroconsumer b. Decomposer c. Omnivore d. Producer
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42) Decomposers are: a. Autotrophs b. Heterotrophs c. Organotropbs d. Autoheterotrophs
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43) In the phosphorus cycle, weathering makes phosphate available first to: a. Decomposers b. Consumers c. Producers d. All the above
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44) During food chain the maximum energy is stored in: a. Producers b. Decomposers c. Herbivores d. Carnivores
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45) In the following there is no difference: a. Trophic level 1st and herbivores b. Primary consumers and herbivores c. Primary carnivore and trophic level 2nd d. Secondary consumer and herbivores
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46) The ultimate energy source of ecosystem is: a. Solar energy b. Biomass c. Producer d. Carbohydrates
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47) Ecological pyramids were discovered by: a. Elton b. Odum c. Reiter d. None of these
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48) An ecosystem which can be easily damaged but can recover after sometime if damaging effect stops will be having: a. High stability and low resilience b. Low stability and low resilience c. Low stability and high resilience d. High stability and high resillience
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49) The correct sequence of food chain is: a. Grass-insect-bird-snake b. Grass-bird-insect-snake c. Snake-bird-insect-grass d. Grass-snake-bird-insect
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50) Bacteria and fungi in a forest ecosystem are generally: a. Producers b. Decomposers c. Primary consumers d. Secondary consumers e. Tertiary consumers
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