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1) The word ecosystem was coined by: a. Daubenmire/R.Misra/Koestle b. Tansley c. Weaver and Clements d. Odum/Kormondy
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2) Ecosystem has two components: a. Plants and animals b. Weeds and trees c. Biotic and abiotic d. Frogs and men
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3) Which one of the following terms does not reflect the idea of ecosystem: a. Holocoene b. Cherposem c. Biosystem d. Geobiocoenosis
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4) Competition for water, minerals, light and space is most severe between two: a. Closely related species occupying the same niche b. Closely related species occupying different niche c. Unrelated species occupying the same niche d. Species occupying different overlapping ecosystems
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5) Ecosystem is: a. Both open and closed unit depending upon the biomass present b. Closed unit c. Open unit d. Both open and closed unit depending upon community type
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6) Each human couple should produce only two children which help in: a. Checking pollution b. Fertility of soil c. Stabilizing the ecosystem d. Improving food-web
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7) A habitat of long severe winters and growing season limited to a few months of summer constitutes: a. Savana ecosystem b. Taiga ecosystem c. Tundra ecosystem d. None of the above
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8) An ecosystem is: a. A community of organisms interacting with one another b. The abiotic component of an area c. The part of the earth and its atmosphere where living organisms exist d. A community of organisms together with the environment in which they live
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9) An ecosystem may be defined as: a. A localized association of several plants and animals b. Different communities of plants, animals and microbes, together with their physico-chemical environments c. Different communities of plants and microbesm plus their physico-chemical environments d. None of the above
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10) In natural ecosystem, decomposers include: a. Only bacteria and fungi b. Only microscopic animals c. The above two types of organisms plus mactoseopic animals d. Only the above two types of organisms
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11) Pond is an example of: a. Artificial ecosystem b. Forest ecosystem c. Natural ecosystem d. Grassland ecosystem
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12) The term biosphere is used for the zone of earth where life exists: a. On the lithosphere surface b. In the hydrosphere c. In the lithosphere, hydrosphere and atmosphere d. In the lithosphere and hydrosphere
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13) Ecosystem may be defined as: a. Group of plants, which act as the energy suppliers b. Group of organisms which form population c. Functional unit for ecological studies d. None of these
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14) The earth could have sustained more population if all the people would have been: a. Pure vegetarians b. Milk drinker and vegetarian c. Non-vegetarians d. Dependent upon milk, egg and vegetarian habit
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15) Prairies and steppes are parts of the natural regions called: a. Temperate grasslands b. Tropical grasslands c. Prairie grasslands d. Steppes grasslands
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16) Which of the following habitats is most unsuitable for primary productivity: a. Meadow b. Forested river bank c. Cave d. Pond
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17) The pyramid that cannot be inverted in a stable ecosystem is the pyramid of: a. Energy b. Number c. Biomass d. All of these
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18) Nepenthes is a : a. Primary producer b. Consumer c. Primary producer and consumer d. None of the above
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19) The minimum number of components required for an ecosystem to survive: a. Producer and primary consumer b. Producer and decomposer c. Primary consumer and decomposer d. Primary and secondary consumer e. Producer and secondary consumer
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20) In an aquatic environment, microscopic animals and plants are collectively known: a. Commensals b. Herbivores c. Fauna and flora d. Planktons
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21) The incorporation of minerals by microbes is called: a. Mineralization b. Humification c. Nutrient immobilization d. Microbe immobilization
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22) Carnivores are: a. Usually primary consumers b. Usually secondary consumers c. Usually decomposers rather than consumers d. Usually secondary or tertiary consumers
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23) The significance of ecosystem lies in: a. Flow of energy b. Cycling of matters c. Both (a) & (b) d. None of the above
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24) In a food chain, man is: a. Producer b. Primary consumer only c. Primary and Secondary consumer d. Secondary consumer only
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25) The first link in any food chain is a green plant because: a. They are widely distributed b. They are firmly fixed to soil c. They alone have the capacity to fix the atmospheric CO2 in the presence of sunlight d. There are more herbivorous animals than the carnivorous
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26) A food chain consists of: a. Producers and primary consumers b. Producer, herbivores and carnivores c. Produers, carnivores and decomposers d. Producers, consumers and decomposers
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27) Biophere refers to: a. Plants of a particular area b. Area occupied by living beings c. Plants of world d. Spherical plants
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28) The number of primary producers within a specified area world be maximum in: a. Pond ecosystem b. Grassland ecosystem c. Desert ecosystem d. Forest ecosystem
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29) Green plants constitute: a. The first trophic level b. The second trophic level c. The third trophic level d. The fourth trophic level
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30) Which of the following characterizes the biomass in an ecosystem? a. The biomass of producers is less than the combined biomass of consumers and decomposers b. No general statement can be made about relative biomass of different ecological groups c. The biomass of secondary consumers is usually greater than the biomass of primary consumers d. The biomass of producers is generally greater than the biomass of primary consumers
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31) A food chain starts with: a. Nitrogen fixing organisms b. Photosynthesizing organisms c. Respiration d. Decomposers
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32) Which of the following world is related to Homo sapiens? a. Herbivore b. Carnivore c. Autotroph d. Omnivore
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33) The importance of ecosystem lies in: a. Cycling of materials b. Flow of energy c. Both (a) & (b) d. None of the above
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34) The following belong to the same trophic level: a. Tiger and wild beer b. Snake and earthworm c. Deer and honey bee d. Crow and cow
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35) Mark the correct statement: a. Phagotrophs are transducers b. Some herbivores are converters c. Microconsumers are saprotrophs d. All are correct
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36) The gross primary production is maximum in the following ecosystem: a. Open sea b. Grasslands and pastures c. Coniferous forests d. Tropical and sub-tropical forest
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37) In lake ecosystem, the pyramid of biomass is: a. Upright b. Inverted c. Anything possible d. None is correct
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38) If corbon dioxide is withdrawn from the biosphere, which organism would first experience negative effect? a. Primary consumers b. Producers c. Secondary consumers d. Tertiary consumers
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39) Man is a: a. Producer b. Consumer c. Herbivore d. None of these
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40) The two major functional components of an ecosystem are: a. Energy flow and food chain b. Mineral recycling and energy flow c. Food chain and decomposers d. Energy flow and decomposers
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41) The trophic level of lion is a forest ecosystem is: a. T3 b. T4 c. T2 d. T1
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42) The pyramid of energy is always: a. Inverted b. Upright c. Both of these/Horizontal d. Inverted in forest ecosystem
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43) The driving force of the ecosystem is: a. Carbohydrates in plants b. Biomass c. Solar energy d. Producers
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44) In forest ecosstem, pyramid of number is: a. Upright b. Inverted c. Any of the two d. None of the above
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45) Which is a primary consumer? a. Scavenger b. Saprophyte c. Carnivore d. Herbivore
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46) The transfer of energy from organism to organism is a natural community establishes: a. Food chains b. Biological control c. Natural barriers d. All the above
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47) Which of the following is non-renewable source of energy: a. Mineral b. Water c. Forest d. Solar energy
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48) Tip of ecological pyramid is occupied by: a. Herbivores b. Carnivores c. Producers d. None of these
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49) If precise quantitative measurements are made on a convined ecosystem in a laboratory, we will find amounts of which of the following to be a one-way flow rather than cyclic? a. Carbon b. Potassium c. Nitrogen d. Free energy
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50) The decomposers in an ecosystem constitute the following trophic level: a. T1 b. T3 c. T5 d. T4
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