256 + Interview Questions in Ecosystem in Biology – Class 12 Page 1 InterviewSolution

1.	Which of the following statement is correct about pollination?(a) The wind is not an agent of pollination(b) Insects can’t pollinate(c) Fruit formation occurs after pollination(d) Fertilization occurs before pollinationI got this question in class test.Question is from Ecosystem Services topic in portion Ecosystem of Biology – Class 12
Answer» CORRECT choice is (b) Insects can’t pollinate To explain I would SAY: The act of transfer of pollen GRAINS from the male (part) anther to a female part (STIGMA) of a plant is known as pollination. After successful pollination, the process of fertilization occurs which leads to the FORMATION of fruits and seeds.

Discussion

2.	Which of the following statement is incorrect?(a) Forest ecosystem helps in gaseous balance(b) Forest ecosystem helps in pollination(c) Forest ecosystem leads to the extinction of all organisms(d) Forest ecosystem prevents drought and floodsI have been asked this question in unit test.My doubt stems from Ecosystem Services in division Ecosystem of Biology – Class 12
Answer» Right answer is (C) Forest ecosystem leads to the extinction of all organisms Easy explanation: Ecological services are SAID to be the PRODUCTS of ecosystem processes. They are the BASE for economic, environmental, and aesthetic goods and services for a healthy ecosystem. The forest ecosystem is essential for the survival of species.

Discussion

3.	Whose work is to protect the land from floods, remove sediments and other pollutants and recharge groundwater?(a) Wetlands(b) Oceans(c) Rivers(d) ForestsThe question was posed to me in unit test.I'm obligated to ask this question of Ecosystem Services in section Ecosystem of Biology – Class 12
Answer» Right choice is (a) Wetlands Easy EXPLANATION: The formation of the wetland is a part of ecosystem SERVICE. Wetland is a type of ecosystem that is covered by water. The wetlands protect the LAND from floods, helps in the removal of sediments and other POLLUTANTS and RECHARGE the groundwater.

Discussion

4.	Which of the following shows a one-way passage in an ecosystem?(a) Potassium(b) Carbon(c) Phosphorous(d) Free energyThis question was addressed to me in an online quiz.My doubt is from Ecosystem Services topic in portion Ecosystem of Biology – Class 12
Answer» Correct answer is (d) Free energy For explanation I would say: The movement of energy from the HIGHER trophic LEVELS and its DISTRIBUTION and loss as heat to the lower trophic levels in the environment is unidirectional. It MEANS the energy moves in one direction only that is from higher to the lower-most level.

Discussion

5.	What is released as a byproduct of photosynthesis?(a) CO2(b) NH4(c) O2(d) H2This question was addressed to me during an interview.My doubt stems from Ecosystem Services in portion Ecosystem of Biology – Class 12
Answer» CORRECT choice is (c) O2 The best I can explain: Photosynthesis is a process in which PRODUCERS (green plants) in the presence of CO2, water, sunlight, and chlorophyll yield energy and OXYGEN is released in the FORM of gas. The green plants UTILIZE atmospheric CO2 and release O2 which is utilized by other organisms.

Discussion

6.	How do green plants fix CO2?(a) Respiration(b) Photosynthesis(c) Fertilization(d) PollinationThis question was posed to me in unit test.This intriguing question comes from Ecosystem Services in chapter Ecosystem of Biology – Class 12
Answer» Right choice is (b) Photosynthesis Easiest explanation: Photosynthesis is a process in which producers (green plants) in the presence of CO2, water, SUNLIGHT, and chlorophyll yield energy and oxygen is RELEASED in the FORM of gas. The green plants utilize ATMOSPHERIC CO2 and release O2 which is UTILIZED by other organisms.

Discussion

7.	Which of the following are ecological services?(a) O2 fixation, CO2 release, and pollution(b) Nitrogen fixation and pollution(c) CO2 fixation, O2 release, and pollination(d) CO2 fixation, fertilization, and the release of sodiumI got this question during an online exam.Query is from Ecosystem Services topic in chapter Ecosystem of Biology – Class 12
Answer» Right option is (C) CO2 FIXATION, O2 release, and pollination To explain: Ecological services are said to be the products of ECOSYSTEM processes. The base for economic, environmental and aesthetic goods and services is a healthy ecosystem. CO2 fixation, O2 release, and pollination are some of them.

Discussion

8.	Out of the total cost of various ecosystem services, how much is the cost of climate regulation and habitat for wildlife?(a) 20 % each(b) 10 % each(c) 50 % each(d) 6 % eachThis question was addressed to me by my college professor while I was bunking the class.I would like to ask this question from Ecosystem Services topic in portion Ecosystem of Biology – Class 12
Answer» The correct choice is (d) 6 % each Easy explanation: Ecological services are said to be the products of ecosystem processes. It is THOUGHT that biodiversity CARRIES a hefty price tag. Out of the total cost of various ecosystem services, the cost of climate regulation and habitat for wildlife is 6 % each.

Discussion

9.	Out of the total cost of various ecosystem services, how much is the cost of recreation and nutrient cycling?(a) 50 %(b) 88 %(c) > 10 %(d) < 20 %I got this question in quiz.The doubt is from Ecosystem Services topic in division Ecosystem of Biology – Class 12
Answer» RIGHT choice is (c) > 10 % To ELABORATE: Ecological services are said to be the products of ecosystem processes. It is thought that biodiversity carries a hefty PRICE tag. Out of the total cost of various ecosystem services, less than 10 percent is the cost of recreation and nutrient CYCLING.

Discussion

10.	Why are the fundamental ecosystems services largely taken for granted?(a) Because they are expensive(b) Because they are free(c) Because they are exploited(d) Because they are highly-pricedI had been asked this question in unit test.My question is taken from Ecosystem Services in chapter Ecosystem of Biology – Class 12
Answer» Right option is (b) Because they are free The BEST I can EXPLAIN: Ecological services are said to be the products of ecosystem processes. The BASE for economic, environmental and aesthetic goods and services is a healthy ecosystem. Since these services are free they are highly taken for GRANTED.

Discussion

11.	Out of the total cost of various ecosystem services, how much is the cost of the soil formation?(a) 2 percent(b) 90 percent(c) 70 percent(d) 50 percentI had been asked this question by my college director while I was bunking the class.My enquiry is from Ecosystem Services topic in portion Ecosystem of Biology – Class 12
Answer» Right CHOICE is (d) 50 percent Easiest explanation: ECOLOGICAL services are said to be the PRODUCTS of ecosystem processes. It is thought that biodiversity CARRIES a hefty price tag. Out of the total cost of VARIOUS ecosystem services, a 50 percent cost is required for soil formation.

Discussion

12.	According to the researchers, what is the average price tag of these fundamental ecosystem services?(a) US (dollarSign) 300 trillion a year(b) US (dollarSign) 33 trillion a year(c) US (dollarSign) 5 trillion a year(d) US (dollarSign) 1000 trillion a yearThe question was posed to me at a job interview.This key question is from Ecosystem Services topic in division Ecosystem of Biology – Class 12
Answer» CORRECT ANSWER is (c) US $ 5 trillion a year The EXPLANATION: Ecological services are said to be the PRODUCTS of ecosystem PROCESSES. It is thought that biodiversity carries a hefty price tag. According to the researchers, the average price tag of these fundamental ecosystem services is the US $ 33 trillion a year.

Discussion

13.	Who has very recently tried to put price tags on nature’s life-support services?(a) Rudolf Virchow and his colleagues(b) Gregor Mendel and his colleagues(c) Robert Brown and his colleagues(d) Robert Constanza and his colleaguesI got this question by my college professor while I was bunking the class.The doubt is from Ecosystem Services topic in section Ecosystem of Biology – Class 12
Answer» The correct answer is (d) ROBERT Constanza and his colleagues Explanation: ECOLOGICAL services are said to be the products of ECOSYSTEM processes. It is thought that biodiversity carries a hefty PRICE tag. The action of putting price tags on NATURE’s life-support services was recently done by Robert Constanza and his colleagues.

Discussion

14.	Which of the following ecosystem helps in the pollination of crops?(a) Unfit ecosystem(b) Healthy ecosystem(c) Bad ecosystem(d) Unhealthy ecosystemThe question was posed to me in quiz.My question is based upon Ecosystem Services topic in portion Ecosystem of Biology – Class 12
Answer» RIGHT answer is (b) Healthy ecosystem The best explanation: The healthy forest ECOSYSTEMS HELP in the pollination of crops. It is the ecological SERVICE that is the product of ecosystem processes. Healthy ecosystems also provide aesthetic, cultural and spiritual VALUES.

Discussion

15.	What are the products of ecosystem processes named?(a) Ecological services(b) Ecological succession(c) Ecological issues(d) Ecological cycleThe question was posed to me by my school principal while I was bunking the class.Enquiry is from Ecosystem Services topic in division Ecosystem of Biology – Class 12
Answer» The correct answer is (a) Ecological services The best explanation: Ecological services are said to be the products of ecosystem processes. The purified air and water, NUTRIENTS cycles, generation of fertile SOIL, PROVIDING habitat, maintaining biodiversity, providing storage sites for various MINERALS, ETC. are the services provided by the healthy forest ecosystems.

Discussion

16.	What is the base for economic, environmental and aesthetic goods and services?(a) Unhealthy ecosystem(b) Healthy ecosystem(c) Bad ecosystem(d) Convergent ecosystemI got this question in my homework.I'd like to ask this question from Ecosystem Services topic in chapter Ecosystem of Biology – Class 12
Answer» Correct answer is (B) Healthy ecosystem The explanation is: The organizational level before biomes and after the population is called an ecosystem. An ecosystem consists of biotic and abiotic COMPONENTS that interact within a system. The BASE for economic, environmental and AESTHETIC goods and SERVICES is a healthy ecosystem.

Discussion

17.	What is the killing of aquatic life due to the depletion of oxygen because of the excessive growth of algae due to the over-abundance of phosphorous in the coastal areas called?(a) Leaching(b) Respiration(c) Photosynthesis(d) EutrophicationThe question was posed to me in class test.Question is taken from Ecosystem in portion Ecosystem of Biology – Class 12
Answer» Right choice is (d) EUTROPHICATION Explanation: Eutrophication is the process that leads to the KILLING of AQUATIC life due to the depletion of oxygen because of the excessive growth of algae due to the over-abundance of PHOSPHOROUS in the coastal areas. Eutrophication is ALSO known as hypertrophication and is the result of an increase in minerals in a water body.

Discussion

18.	In which form do the producers directly provide phosphorous to detritus?(a) Weathering(b) Litterfall(c) Fecal matter(d) SaltsI had been asked this question in semester exam.This key question is from Ecosystem in portion Ecosystem of Biology – Class 12
Answer» Right option is (b) Litterfall To EXPLAIN: The DEAD PLANT materials that falls on the ground in the form of litter are known as litterfall. This litter includes leaves, bark, needles, twigs, cladodes, etc. It also CONSISTS of some amount of soil.

Discussion

19.	The phosphate by weathering of rocks firstly becomes available to which organisms?(a) Decomposers(b) Consumers(c) Producers(d) DetritivoresI have been asked this question by my college director while I was bunking the class.My query is from Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» Right ANSWER is (c) Producers The EXPLANATION: The phosphorous enters in the ecosystem through the WEATHERING of rock minerals. This phosphorous then enters soil that is taken up by the producers. Then it is passed on to consumers and then to decomposers.

Discussion

20.	Which of the following is known as the natural reservoir of phosphorous?(a) Fossils(b) Rocks(c) Animals(d) WaterThis question was posed to me during an online exam.Asked question is from Ecosystem topic in chapter Ecosystem of Biology – Class 12
Answer» Right answer is (b) Rocks Easy explanation: The crystalline, SEDIMENTARY rocks are known as the natural RESERVOIR of phosphorous. They CONTAIN phosphorous in the form of PHOSPHATES known as phosphorite. It contains almost 4% to 20% of phosphate.

Discussion

21.	Which of the biochemical cycle is without an atmospheric component?(a) Nitrogen cycle(b) Oxygen cycle(c) Phosphorous cycle(d) Carbon cycleI have been asked this question during an online interview.My question comes from Ecosystem in portion Ecosystem of Biology – Class 12
Answer» Correct option is (c) PHOSPHOROUS cycle For explanation: The sedimentary rocks are known as the natural RESERVOIR of phosphorous. It ENTERS in the ECOSYSTEM through rock minerals. The BIOCHEMICAL cycle is without an atmospheric component is the phosphorous cycle.

Discussion

22.	Which biogenetic element is obtained from crystalline rocks?(a) Argon(b) Helium(c) Phosphorous(d) MagnesiumI had been asked this question in an online interview.Question is taken from Ecosystem in section Ecosystem of Biology – Class 12
Answer» The CORRECT choice is (c) Phosphorous For explanation: The crystalline, SEDIMENTARY rocks are known as the natural reservoir of phosphorous. They contain phosphorous in the FORM of phosphates known as phosphorite. It contains almost 4% to 20% of PHOSPHATE.

Discussion

23.	Which of the following is a major constituent of DNA and RNA?(a) Calcium(b) Cobalt(c) Selenium(d) PhosphorousI have been asked this question by my college professor while I was bunking the class.Question is from Ecosystem topic in portion Ecosystem of Biology – Class 12
Answer» Correct CHOICE is (d) Phosphorous For explanation: The phosphorous is one of the FOLLOWING is a major constituent of nucleic acids, biological membranes, and cellular energy TRANSFER systems. It is the second most ABUNDANT mineral of the HUMAN body and constitutes 1 % of the total body weight.

Discussion

24.	How do herbivores and other animals obtain phosphorous?(a) Soil(b) Rocks(c) Water(d) PlantsI got this question in my homework.My question is taken from Ecosystem in chapter Ecosystem of Biology – Class 12
Answer» Right choice is (d) PLANTS The explanation: The PHOSPHOROUS is one of the following is a major constituent of nucleic acids, biological membranes, and cellular energy TRANSFER systems. The plants are the SOURCE of phosphorous for herbivores and other animals.

Discussion

25.	Which one of the following is the simplified sequence of phosphorus cycling in a terrestrial ecosystem?(a) Soil → Producers → Rock minerals → Consumers → Decomposers(b) Rock minerals → Soil → Producers → Consumers → Decomposers(c) Rock minerals → Decomposers → Producers → Consumers(d) Decomposers → Rock minerals → Consumers → ProducersThis question was posed to me in final exam.I would like to ask this question from Ecosystem topic in portion Ecosystem of Biology – Class 12
Answer» Correct option is (B) ROCK minerals → Soil → Producers → Consumers → DECOMPOSERS Easiest explanation: The phosphorous CYCLE starts with rock materials and ends with the decomposers. The phosphorous enters the ecosystem through rock minerals and, there is a negligible exchange of gaseous PHOSPHORUS between organism and environment.

Discussion

26.	How is the gaseous exchange of phosphorus between organisms and the environment?(a) Maximum(b) Moderate(c) Negligible(d) No exchangeI got this question at a job interview.I'm obligated to ask this question of Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» The correct choice is (c) Negligible Easiest EXPLANATION: The phosphorous is ONE of the FOLLOWING is a major CONSTITUENT of nucleic acids, biological membranes, and cellular energy transfer systems. UNLIKE carbon, there is a negligible exchange of gaseous phosphorus between organisms and the environment.

Discussion

27.	Which element is not released during respiration in the atmosphere?(a) Nitrogen(b) Cobalt(c) Carbon(d) PhosphorousI have been asked this question by my school principal while I was bunking the class.I'm obligated to ask this question of Ecosystem topic in chapter Ecosystem of Biology – Class 12
Answer» CORRECT CHOICE is (d) Phosphorous Easy EXPLANATION: The respiration is the process in which the ORGANISMS EXCHANGE gases with the environment. In this, the organisms take in the atmospheric oxygen for various cellular activities and release carbon dioxide. Phosphorous is not released during respiration in the atmosphere.

Discussion

28.	Which of the following component is used to make shells, bones, and teeth by animals?(a) Phosphorous(b) Sodium(c) Gallium(d) ArgonThis question was posed to me in final exam.This is a very interesting question from Ecosystem in division Ecosystem of Biology – Class 12
Answer» The correct option is (a) Phosphorous The explanation is: The phosphorous is one of the following is a major CONSTITUENT of nucleic acids, biological membranes, and cellular energy transfer SYSTEMS. It is also USED to make shells, bones, and TEETH by animals.

Discussion

29.	Who is the natural reservoir of phosphorous?(a) Atmospheric gases(b) Rocks(c) Water(d) Dead organismsI had been asked this question by my school principal while I was bunking the class.The doubt is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» The correct choice is (B) Rocks The explanation: The sedimentary rocks are known as the NATURAL reservoir of phosphorous. They contain phosphorous in the form of phosphates known as PHOSPHORITE. It CONTAINS almost 4% to 20% of phosphate.

Discussion

30.	Which one of the following is a major constituent of biological membranes, nucleic acids, and cellular energy transfer systems?(a) Potassium(b) Phosphorous(c) Selenium(d) CobaltThe question was posed to me in exam.I want to ask this question from Ecosystem in portion Ecosystem of Biology – Class 12
Answer» Right choice is (b) Phosphorous To explain: The phosphorous is the second most abundant mineral of the HUMAN body and CONSTITUTES 1 % of the total body weight. It is one of the following is a major constituent of nucleic acids, biological MEMBRANES, and CELLULAR energy transfer systems.

Discussion

31.	For releasing CO2 in the atmosphere, how are fossil fuels exploited?(a) Mined and burned(b) Fragmented and leached(c) Leached and burned(d) Mined and fragmentedThis question was posed to me in my homework.I would like to ask this question from Ecosystem topic in chapter Ecosystem of Biology – Class 12
Answer» Correct answer is (a) Mined and burned The explanation: A FUEL formed by anaerobic decomposition of buried dead ORGANISMS, containing ENERGY is known as a fossil fuel. These are fossil FUELS Mined and burned contributing to the atmospheric CO2.

Discussion

32.	Which one of the following plants use as a source for carbon dioxide?(a) Carbonate rocks(b) Calcium rocks(c) Fossils(d) Atmospheric CO2The question was asked during an internship interview.My enquiry is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» The correct choice is (d) Atmospheric CO2 The explanation is: The plants use atmospheric CO2 as a source of carbon dioxide for food PRODUCTION. They PRODUCE food using photosynthesis. Photosynthesis is a PROCESS in which producers (green plants) in the presence of CO2, water, sunlight, and chlorophyll yield energy and oxygen is released in the FORM of gas.

Discussion

33.	What product does the plants from by photosynthesis using carbon dioxide?(a) Lipids(b) Carbohydrates(c) Proteins(d) SaltsI got this question in an interview for job.My question is based upon Ecosystem in chapter Ecosystem of Biology – Class 12
Answer» The correct choice is (b) Carbohydrates For explanation: The plants FORM carbohydrates USING CARBON dioxide through photosynthesis. Photosynthesis is a PROCESS in which producers (green plants) in the presence of CO2, water, SUNLIGHT, and chlorophyll yield energy and oxygen is released in the form of gas.

Discussion

34.	In which form does the carbon dioxide precipitate after dissolving in water?(a) Calcium oxide(b) Carbon mono-oxide(c) Calcium carbonate(d) Calcium phosphateThe question was posed to me in quiz.The doubt is from Ecosystem in division Ecosystem of Biology – Class 12
Answer» The correct choice is (c) Calcium CARBONATE The EXPLANATION: The CO2 in gaseous form is quite soluble in WATER. When carbon dioxide dissolves in water, it precipitates and leads to the formation of calcium carbonate.

Discussion

35.	Which human activities have significantly influenced the carbon cycle?(a) Afforestation(b) Deforestation only(c) Burning of fossil fuel only(d) Both deforestation and burning of fossil fuelI got this question in quiz.My query is from Ecosystem in division Ecosystem of Biology – Class 12
Answer» The correct option is (d) Both deforestation and BURNING of fossil fuel For explanation I would say: The human activities LIKE excessive deforestation and burning of fossil fuel has GREATLY influenced the carbon CYCLE. These activities have increased the RATE of release of carbon dioxide into the atmosphere.

Discussion

36.	Which of the following organism contributes to the CO2 pool by the processing of waste materials and dead organic matter?(a) Carnivores(b) Herbivores(c) Decomposers(d) ProducersThe question was asked during an interview for a job.The query is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» The correct option is (c) Decomposers Easy explanation: The organisms that are responsible for the BREAK down COMPLEX organic MATTER (dead or decaying organisms) into inorganic substances are called decomposers (detritivores). They process the dead matter PRESENT on land and oceans. The decomposers or detritivores may INCLUDE invertebrates, fungus or bacteria.

Discussion

37.	By which process does the carbon return to the atmosphere as CO2?(a) Decayed organisms(b) Calcareous sediments(c) Photosynthesis(d) RespirationThis question was addressed to me in unit test.My doubt is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» The correct answer is (d) Respiration Best explanation: The respiration is the process in which the organisms exchange GASES with the environment. In this, the organisms TAKE in the atmospheric oxygen for various cellular ACTIVITIES and RELEASE carbon dioxide. Thus the carbon returns to the atmosphere as CO2 with the help of respiration.

Discussion

38.	What amount of carbon is fixed in the biosphere through photosynthesis annually?(a) 10^13 kg(b) 20 × 10^20 kg(c) 4 × 10^13 kg(d) 80 × 10^35 kgI had been asked this question by my college director while I was bunking the class.The origin of the question is Ecosystem in division Ecosystem of Biology – Class 12
Answer» Right choice is (c) 4 × 10^13 kg Explanation: Photosynthesis is a process in which producers (green plants) in the presence of CO2, WATER, sunlight, and chlorophyll yield energy and oxygen is released in the FORM of gas. The amount of carbon FIXED in the biosphere through photosynthesis annually is APPROXIMATELY 4 × 10^13 kg.

Discussion

39.	From which stages does the carbon cycling occur?(a) Dead organisms → Living organisms → Oceans(b) Atmosphere → Living organisms → Dead organisms(c) Oceans → Atmosphere → Dead organisms(d) Atmosphere → Oceans → Living organisms → Dead organismsThis question was addressed to me in final exam.This key question is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» Right choice is (d) ATMOSPHERE → Oceans → LIVING organisms → Dead organisms The best I can explain: The CARBON from the atmosphere in the form of carbon dioxide gets into oceans. Through this, the carbon enters into living organisms and then to dead organisms. This carbon from dead organisms enters the Earth’s crust.

Discussion

40.	Whose reservoir does fossil fuel represent?(a) Oxygen(b) Carbon(c) Helium(d) ArgonThis question was addressed to me by my college professor while I was bunking the class.My question is taken from Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» Correct CHOICE is (B) Carbon The BEST EXPLANATION: The fossil fuel represents the RESERVOIR of carbon. Almost 21.3 gigatons of carbon dioxide are released per year due to the burning of fossil fuels.

Discussion

41.	What percent of total global carbon does the atmosphere contain?(a) 5 %(b) 50 %(c) 1%(d) 20 %The question was posed to me in class test.My question is from Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» Correct option is (c) 1% The best explanation: Almost 49 PERCENT of the total DRY weight of living things is constituted by CARBON. The atmosphere consists of only 1 % of the total global carbon. It is the fourth most abundant element of the universe.

Discussion

42.	Which reservoir regulates the amount of carbon dioxide in the atmosphere?(a) Gaseous reservoir(b) Sedimentary reservoir(c) Atmospheric reservoir(d) Oceanic reservoirI had been asked this question in an online interview.The origin of the question is Ecosystem in portion Ecosystem of Biology – Class 12
Answer» Right answer is (d) OCEANIC RESERVOIR Explanation: Almost 71 PERCENT of carbon is found DISSOLVED in oceans out of the total quantity of global carbon. Out of this 71 percent, almost 90 percent is found in oceans. The regulation of carbon DIOXIDE in the atmosphere is done by this oceanic reservoir

Discussion

43.	Out of the total quantity of global carbon, what percent of carbon is found dissolved in oceans?(a) 50 %(b) 71 %(c) 90 %(d) 25 %This question was addressed to me in class test.My doubt is from Ecosystem in division Ecosystem of Biology – Class 12
Answer» CORRECT choice is (b) 71 % Easy explanation: ALMOST 71 PERCENT of carbon is found DISSOLVED in oceans out of the total quantity of global carbon. Out of this 71 percent, almost 90 percent is found in oceans. The oceans consist of 38,000- 40,000 gigatons (Gt) of carbon.

Discussion

44.	Which is the most abundant constituent found in living organisms?(a) Water(b) Oxygen(c) Ammonia(d) Hydrogen bicarbonateThe question was asked by my college professor while I was bunking the class.I need to ask this question from Ecosystem in section Ecosystem of Biology – Class 12
Answer» Right option is (a) Water Best EXPLANATION: The most ABUNDANT compound FOUND in living organisms is water. It is the most important compound for the survival of living organisms. A human BODY CONSISTS of 60% water.

Discussion

45.	What percent of dry weight does carbon constitute in the living organisms?(a) 55 percent(b) 49 percent(c) 20 percent(d) 90 percentThis question was addressed to me in my homework.The query is from Ecosystem topic in portion Ecosystem of Biology – Class 12
Answer» Right answer is (b) 49 percent The explanation is: The carbon constitutes APPROXIMATELY 49 percent of the total dry weight of living THINGS. It is the second most abundant THING FOUND in nature next to the water. It is the fourth most abundant element of the universe.

Discussion

46.	Limestone and dolomite are the reservoirs of which cycle?(a) Gaseous cycle(b) Bicycle(c) Ecological cycle(d) Sedimentary cycleThe question was asked by my college director while I was bunking the class.I need to ask this question from Ecosystem in chapter Ecosystem of Biology – Class 12
Answer» Right choice is (d) Sedimentary cycle The explanation is: The Earth’s crust is the reservoir for the sedimentary type of NUTRIENT cycle. LIMESTONE and DOLOMITE are FOUND in Earth’s crust that harbors various elements such as calcium, magnesium, sulphur, phosphorous, etc.

Discussion

47.	What is the function of the reservoir that is the atmosphere and the Earth’s crust?(a) Exhaustion of nutrients(b) Meet with the deficit of nutrients(c) Formation of nutrients(d) Piling up of nutrientsThe question was asked by my college director while I was bunking the class.My query is from Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» The CORRECT ANSWER is (b) Meet with the deficit of nutrients For explanation I WOULD say: The function of the reservoir that is the atmosphere and the Earth’s crust is to meet with the deficit of nutrients. This deficit occurs due to an imbalance in the rate of INFLUX and efflux of various nutrients.

Discussion

48.	What so the environmental factors, e.g., soil, moisture, pH, temperature, etc. regulate?(a) The rate of piling up of nutrients(b) The rate of formation of nutrients(c) The rate of release of nutrients(d) The rate of exhaustion of nutrientThis question was addressed to me during a job interview.I would like to ask this question from Ecosystem topic in section Ecosystem of Biology – Class 12
Answer» CORRECT choice is (c) The rate of release of nutrients The best I can explain: Various ENVIRONMENTAL FACTORS, e.g. soil, moisture, pH, TEMPERATURE, etc. are responsible for changing environmental conditions leading to change in the ecosystem. These factors are responsible for REGULATING the rate of flow of nutrients within an ecosystem and into the atmosphere.

Discussion

49.	Where is the sedimentary type of nutrient cycle located?(a) Land surface(b) Earth’s crust(c) Atmosphere(d) WaterThis question was addressed to me in quiz.Query is from Ecosystem in section Ecosystem of Biology – Class 12
Answer» Correct CHOICE is (b) Earth’s crust Explanation: The Earth’s crust is the RESERVOIR for the sedimentary type of nutrient cycle. It consists of nutrient cycles of elements such as calcium, magnesium, sulphur, PHOSPHOROUS, ETC.

Discussion

50.	What are the essential elements required by organisms for their body-building and metabolism called?(a) Phytochemicals(b) Viruses(c) Bacteria(d) BiogeochemicalsThis question was posed to me in an interview for job.I'm obligated to ask this question of Ecosystem in section Ecosystem of Biology – Class 12
Answer» The correct ANSWER is (d) Biogeochemicals Explanation: Biogeochemicals are the essential elements required by organisms for their body-building and METABOLISM. They are PROVIDED by the Earth and RETURN back to the Earth after the organisms’ death and decay.

Discussion

Explore topic-wise InterviewSolutions in .

Whose work is to protect the land from floods, remove sediments and other pollutants and recharge groundwater?(a) Wetlands(b) Oceans(c) Rivers(d) ForestsThe question was posed to me in unit test.I'm obligated to ask this question of Ecosystem Services in section Ecosystem of Biology – Class 12

Which of the following shows a one-way passage in an ecosystem?(a) Potassium(b) Carbon(c) Phosphorous(d) Free energyThis question was addressed to me in an online quiz.My doubt is from Ecosystem Services topic in portion Ecosystem of Biology – Class 12

What is released as a byproduct of photosynthesis?(a) CO2(b) NH4(c) O2(d) H2This question was addressed to me during an interview.My doubt stems from Ecosystem Services in portion Ecosystem of Biology – Class 12

How do green plants fix CO2?(a) Respiration(b) Photosynthesis(c) Fertilization(d) PollinationThis question was posed to me in unit test.This intriguing question comes from Ecosystem Services in chapter Ecosystem of Biology – Class 12

Out of the total cost of various ecosystem services, how much is the cost of recreation and nutrient cycling?(a) 50 %(b) 88 %(c) > 10 %(d) < 20 %I got this question in quiz.The doubt is from Ecosystem Services topic in division Ecosystem of Biology – Class 12

Which of the following ecosystem helps in the pollination of crops?(a) Unfit ecosystem(b) Healthy ecosystem(c) Bad ecosystem(d) Unhealthy ecosystemThe question was posed to me in quiz.My question is based upon Ecosystem Services topic in portion Ecosystem of Biology – Class 12

In which form do the producers directly provide phosphorous to detritus?(a) Weathering(b) Litterfall(c) Fecal matter(d) SaltsI had been asked this question in semester exam.This key question is from Ecosystem in portion Ecosystem of Biology – Class 12

Which of the following is known as the natural reservoir of phosphorous?(a) Fossils(b) Rocks(c) Animals(d) WaterThis question was posed to me during an online exam.Asked question is from Ecosystem topic in chapter Ecosystem of Biology – Class 12

Which of the biochemical cycle is without an atmospheric component?(a) Nitrogen cycle(b) Oxygen cycle(c) Phosphorous cycle(d) Carbon cycleI have been asked this question during an online interview.My question comes from Ecosystem in portion Ecosystem of Biology – Class 12

Which biogenetic element is obtained from crystalline rocks?(a) Argon(b) Helium(c) Phosphorous(d) MagnesiumI had been asked this question in an online interview.Question is taken from Ecosystem in section Ecosystem of Biology – Class 12

Which of the following is a major constituent of DNA and RNA?(a) Calcium(b) Cobalt(c) Selenium(d) PhosphorousI have been asked this question by my college professor while I was bunking the class.Question is from Ecosystem topic in portion Ecosystem of Biology – Class 12

How do herbivores and other animals obtain phosphorous?(a) Soil(b) Rocks(c) Water(d) PlantsI got this question in my homework.My question is taken from Ecosystem in chapter Ecosystem of Biology – Class 12

How is the gaseous exchange of phosphorus between organisms and the environment?(a) Maximum(b) Moderate(c) Negligible(d) No exchangeI got this question at a job interview.I'm obligated to ask this question of Ecosystem topic in section Ecosystem of Biology – Class 12

Which element is not released during respiration in the atmosphere?(a) Nitrogen(b) Cobalt(c) Carbon(d) PhosphorousI have been asked this question by my school principal while I was bunking the class.I'm obligated to ask this question of Ecosystem topic in chapter Ecosystem of Biology – Class 12

Which of the following component is used to make shells, bones, and teeth by animals?(a) Phosphorous(b) Sodium(c) Gallium(d) ArgonThis question was posed to me in final exam.This is a very interesting question from Ecosystem in division Ecosystem of Biology – Class 12

Who is the natural reservoir of phosphorous?(a) Atmospheric gases(b) Rocks(c) Water(d) Dead organismsI had been asked this question by my school principal while I was bunking the class.The doubt is from Ecosystem in section Ecosystem of Biology – Class 12

Which one of the following plants use as a source for carbon dioxide?(a) Carbonate rocks(b) Calcium rocks(c) Fossils(d) Atmospheric CO2The question was asked during an internship interview.My enquiry is from Ecosystem in section Ecosystem of Biology – Class 12

What product does the plants from by photosynthesis using carbon dioxide?(a) Lipids(b) Carbohydrates(c) Proteins(d) SaltsI got this question in an interview for job.My question is based upon Ecosystem in chapter Ecosystem of Biology – Class 12

In which form does the carbon dioxide precipitate after dissolving in water?(a) Calcium oxide(b) Carbon mono-oxide(c) Calcium carbonate(d) Calcium phosphateThe question was posed to me in quiz.The doubt is from Ecosystem in division Ecosystem of Biology – Class 12

Which human activities have significantly influenced the carbon cycle?(a) Afforestation(b) Deforestation only(c) Burning of fossil fuel only(d) Both deforestation and burning of fossil fuelI got this question in quiz.My query is from Ecosystem in division Ecosystem of Biology – Class 12

By which process does the carbon return to the atmosphere as CO2?(a) Decayed organisms(b) Calcareous sediments(c) Photosynthesis(d) RespirationThis question was addressed to me in unit test.My doubt is from Ecosystem in section Ecosystem of Biology – Class 12

Whose reservoir does fossil fuel represent?(a) Oxygen(b) Carbon(c) Helium(d) ArgonThis question was addressed to me by my college professor while I was bunking the class.My question is taken from Ecosystem topic in section Ecosystem of Biology – Class 12

What percent of total global carbon does the atmosphere contain?(a) 5 %(b) 50 %(c) 1%(d) 20 %The question was posed to me in class test.My question is from Ecosystem topic in section Ecosystem of Biology – Class 12

Out of the total quantity of global carbon, what percent of carbon is found dissolved in oceans?(a) 50 %(b) 71 %(c) 90 %(d) 25 %This question was addressed to me in class test.My doubt is from Ecosystem in division Ecosystem of Biology – Class 12

Which is the most abundant constituent found in living organisms?(a) Water(b) Oxygen(c) Ammonia(d) Hydrogen bicarbonateThe question was asked by my college professor while I was bunking the class.I need to ask this question from Ecosystem in section Ecosystem of Biology – Class 12

What percent of dry weight does carbon constitute in the living organisms?(a) 55 percent(b) 49 percent(c) 20 percent(d) 90 percentThis question was addressed to me in my homework.The query is from Ecosystem topic in portion Ecosystem of Biology – Class 12

Limestone and dolomite are the reservoirs of which cycle?(a) Gaseous cycle(b) Bicycle(c) Ecological cycle(d) Sedimentary cycleThe question was asked by my college director while I was bunking the class.I need to ask this question from Ecosystem in chapter Ecosystem of Biology – Class 12

Where is the sedimentary type of nutrient cycle located?(a) Land surface(b) Earth’s crust(c) Atmosphere(d) WaterThis question was addressed to me in quiz.Query is from Ecosystem in section Ecosystem of Biology – Class 12