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question_answer1) Which of the following is the source of carbon to plants
question_answer2) The conversion of nitrate to nitrous oxide and nitrogen gas is termed as [KCET 2000]
question_answer3) In nitrogen cycle, which of the following plays an important role
question_answer4) Nitrogen cycle involves bacteria capable of changing proteins to ammonia called as
question_answer5) Carbon is available to crop plants in the form of
question_answer6) Which of the following contribute to the carbon cycle
question_answer7) One of the following atoms often limit the primary productivity of an ecosystem
question_answer8) Biogeochemical cycles can be traced in
question_answer9) The phosphorus cycle differs from those of carbon and nitrogen as well as those of sulphur, oxygen and hydrogen in that it lacks
question_answer10) In biogeochemical cycles, chemicals pass through
question_answer11) The organisms which participate most actively in nitrogen cycle in nature are
question_answer12) Biocycle is referred as
question_answer13) Biogeochemcial cycles are of
question_answer14) Sedimentary cycle having a small gaseous component also is found in
question_answer15) Which is involved in sedimentary cycle
question_answer16) The reservoir pool for gaseous cycles of matter is
question_answer17) The reservoir pool of carbon is
question_answer18) For recycling of materials which one is most necessary
question_answer19) Burning of fossil fuels affects
question_answer20) In carbon cycle, source of carbon to plants is
question_answer21) The process of evapo-transpiration and precipitation is known as
question_answer22) Global water cycle involves
question_answer23) Local water cycle involves
question_answer24) The agent/s which make/s free atmospheric nitrogen available to plants is/are
question_answer25) Non biological nitrogen fixation is
question_answer26) Phosphorus is mostly found in rocks in combination with
question_answer27) Phosphorus cycle is
question_answer28) Phosphorus of ocean becomes available to land plants due to
question_answer29) Volcano eruption disturbs
question_answer30) Phosphorus cycles in the form of
question_answer31) Inorganic element that changes food into usable energy is
question_answer32) Degradation of proteins play a part in
question_answer33) In which of the following cycle, an atmospheric cycle is absent
question_answer34) Which of the following is the major source of phosphorus
question_answer35) A biogeochemical cycle without an atmospheric component is
question_answer36) Biogeochemical cycling refers to cycling of [DPMT 1983]
question_answer37) Cycling of elements in an ecosystem is called [DPMT 1983; MP PMT 1987, 99; BHU 2000]
question_answer38) The circulation or cycling of elements in an ecosystem is known as [MP PMT 1987; CBSE PMT 1999]
question_answer39) Maximum contribution of \[{{O}_{2}}\] is from [CBSE PMT 1989]
question_answer40) In water receiving regions, what does forest regulate [MP PMT 1989]
question_answer41) Which of the following cycle would be affected if decomposers of an ecosystem vanish [RPMT 1992]
question_answer42) Nitrogen is a critical element of the ecosystem because it is [BHU 1996]
question_answer43) The phosphorus rich fertilizer obtained from sea birds along the coast of Chile and Peru, is [Rohtak 1996]
question_answer44) \[C{{O}_{2}}\] content of atmosphere has increased in the last 150 years from [AIIMS 1997]
question_answer45) Role of bacteria in carbon cycle is [CBSE PMT 1998]
question_answer46) One way cycle is [Pb. PMT 1999]
question_answer47) Study of Biogeochemical cycles is called Biogeochemistry. Its father is Vernadsky (=Winodgsky). It involves [CBSE PMT 1999]
question_answer48) Amount of nitrogen fixed electrochemically and photochemically is [Kerala 2000]
question_answer49) Crystalline rocks are natural source of biogenetic element [Kerala 2000]
question_answer50) Azotobacter and Clostridium are nitrogen fixing bacteria and found in [Haryana 2000]
question_answer51) The limiting factor in nitrification of soil is [AIIMS 2000]
question_answer52) Biochemical cycle with gaseous phase is [DPMT 2001]
question_answer53) Which one is sedimentary cycle [Kerala 2001]
question_answer54) Nitrogen content of biosphere remains constant due to [AFMC 2001]
question_answer55) Which of the following is present in maximum amount in atmosphere [DPMT 2002]
question_answer56) Nitrates are transformed into nitrogen by [CPMT 2003]
question_answer57) In the phosphorus cycle, phosphate becomes available by weathering of rocks first to [Pb. PMT 2004]
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