productivity of ocean ncert

(a) Cycling of nutrients Discuss in detail the reasons for high productivity of the continental shelves like high nuritent loads, vertical stability and shallowness etc. The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralisation. Nutrient cycles in nature called biogeochemical cycles because the cycling of nutrients occurs between living organisms (bio) and non-living things-geo- (rocks, air and water, etc. (b) Random (b) All organisms of herbivore level are eliminated; and Rest of course, is on land. (v) Annual net primary productivity of the whole biosphere is about 170 billion tons (dry weight) of organic matter. Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. 10. Why are nutrient cycles in nature called biogeochemical cycles? What could be the explanation? For the sedimentary cycle (e.g., sulphur and phosphorus cycle), the reservoir is located in Earth’s crust. Marine productivity Ocean currents have great impact on the biomass production in a region. What will be the P/R ratio of a climax community and a pioneer community? Answer. If yes, give a suitable example. 5. ; Gradient of continental is of 1° or even less. Among the following bio-geo-chemical cycles which one does not have losses due to respiration? ... Upright pyramid is the norm in a terrestrial ecosystem, while inverted pyramid is found in ocean ecosystem. What is an incomplete ecosystem? On this earth only the photosynthetic organisms have the ability to utilize radiant energy and manufacture organic substances using water and carbon dioxide. Expenditure regarding on-the-job training is a source of human capital formation as the return of such expenditure in the form of enhanced labour productivity is more than the cost of it. • In most of the ecosystem, the pyramids of number and biomass are upright. Which of the following ecosystems will be more productive in terms of primary productivity? Answer. And if your answer is ‘no’ explain the meaning of each expression. tropics with its hot and humid.climaticcondition provides an environment which is ideal for the microbes to speed up the process of decomposition. (d) Cycling of nutrients, prevention of soil erosion and pollutant absorption and reduction of the threat of global warming is an ecosystem service provided by a natural ecosystem. (c) Dry arid region (d) Alpine region (a) Plants are called as _____ because they fix carbon dioxide. Southern Ocean: High productivity, high phytoplankton density can yield 1gC/m2/day! Agaricus is a fungus. Discuss the main reason for the low productivity of ocean with your teacher. all living things need nutrients. In relation to energy transfer in ecosystem, explain the statement “10 kg of deer’s meat is equivalent to 1 kg of lion’s flesh”. It contains objective, very short answer type, short answer type, and long answer type questions. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. When it comes to NCERT books, it certainly has an edge over other books in the market. The primary productivity on land is 115 billion tons. (a) Tropical rain forest (b) Antarctic (c) Oceans (d) Estuaries Crustose lichens. (b) The reservoir for the gaseous- type of bio-geo-chemical cycle exists in atmosphere. The ecosystems occur in areas such as tropical forests, flood plains, coral reefs, areas of upwelling, sugarcane fields, etc. An ecosystem is a functional unit with biotic and abiotic factors interacting All the solutions of Ecosystem - Biology explained in detail by experts to help students prepare for their CBSE exams. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. When the productivity increases, the pace of growth is automatically accelerated. Answer. NCERT Exemplar Class 12 Biology is very important resource for students preparing for XII Board Examination. Global primary productivity. 4. Answer. 13. Answer. Name an omnivore which occurs in both grazing food chain and the decomposer food chain. e. urope. 12. (a) In an ecosystem dominated by trees, the pyramid (of numbers) is _____ type. 10. (b) Increase in primary productivity and biomass of producers. Here we have given NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem. Examples of such an ecosystem can be a fish tank or deep aphotic zone of the oceans where producers are absent. (a) Forest (b) Marine (c) Grassland (d) Tundra Answer. • The pyramid of biomass in sea or lake is generally inverted because the biomass of fishes for exceeds that of phytoplankton. Answer. 7. In a food chain, only 10% of the total amount of energy is passed on to the next trophic level from the previous trophic level. The process of decomposition would be the fastest is tropical rain forest. 8. Answer. The biomass generation in secondary productivity is driven by the transfer of organic compounds between trophic levels through feeding. Due to hunting of tiger its population decreases, hence the population of deer (prey) increases and interspecific competition occurs between them. have to have input of nutrients via plant/animal waste, fertilizers, etc. Answer. 16. Answer. 2. Humification leads to accumulation of a dark coloured amorphous substance called humus that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate. It is chlorophyllous and is thus capable of photosynthesis. leading tin producers. 3. 14.3 DECOMPOSITION You may have heard of … Given below is a list of autotrophs and heterotrophs. Answer. (b) Both organic and inorganic nutrients from detritus ; Continental Shelf of all oceans together cover 7.5% of the total area of the oceans. Total net primary production on Earth exceeds 100 billion tons of carbon per year, and it plays a profound role in the global carbon cycle. Question from very important topics are covered by NCERT Exemplar Class 12.You also get idea about the type of questions and method to answer in your class 12th … populations and productivity and nutrient cycling in tropical forest and grassland ecosystems. The degree at which the system can sustain itself without external support is called self sustainability. Rest of course, is on land. Being colloidal in nature it serves as a reservoir of nutrients . • Pyramid of number deals with number of individuals in a trophic level. Natural ecosystem self sustains biotic and abiotic components of an ecosystem. Answer. Poaching (hunting) of tiger disturbs the ecological balance in ecosystem. (c) Very quick Ocean can not have highest productivity. accommodate food webs. Thereby,’ it does not take irlto account the fact that species may belong to two or more trophic levels at a time. Conclude by further summarising the overall economic importance of continental shelves. Minerals deposits of Choose the correct answer: 1. Rest of course, is on land. (kcalm-3 )yr-1 ii. (i) Desert ecosystem Microbes are referred to as heterotrophs and saprotrophs. Sunlight (solar radiation), 12. Name any two organisms which can occupy more than one trophic level in an ecosystem. ; The shelf typically ends at a very steep slope, called the shelf break. Answer. NCERT Exemplar ProblemsMathsPhysicsChemistryBiology. Climax stage is achieved quickly in secondary succession as compared to primary succession. Use the above-provided NCERT MCQ Questions for Class 8 Geography Chapter 5 Industries with Answers Pdf free download and get a good grip on the fundamentals of real numbers topic. Producers. If currents and tides don't bring these into an area, then life suffers proportionally. ncert exercise solution class 12 biology structure and function of ecosystem ... the limiting factor for the productivity is_____. • Desertification. This can happen in cases of forest fires, landslides, changes in soil characteristics, increase in herbivore population leading to overgrazing. We are here to give our best efforts to make your expectations. Under what conditions would a particular stage in the process of succession revert back to an earlier stage? SROCC summarises the disastrous impacts of warming based on current projections of global GHG emissions. But the primary productivity of the oceans are only 55 billion tons. With your knowledge about food chain, establish various linkages between the organisms on the principle of ‘eating and being eaten’. (a) Reduction in primary productivity. 15. Need any support from our end during the preparation of Industries Class 8 MCQs Multiple Choice Questions with Answers then leave your comments below. (a) i and iii (b) i and iv (c) ii and iii (d) i and ii 14. Natural or human induced disturbances like fire, deforestation etc. In ocean, sunlight is the main limiting factor which decreases the rate of photosynthesis. • Among the grassland, pond and forest ecosystem, the number of primary producers per unit area would be maximum in pond ecosystem. Most productive agro-ecosystem is sugarcane and rice ecosystem - 3 - 4 kg/m sq/year. Asia also has deposits of manganese, bauxite, nickel, zinc and copper. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. (c) Organic nutrients from humus Primary Producer’s (First trophic level): Algae, Hydrilla, maize plant, Phytoplankton, Nymphaea, Spirogyra. It is of two types : gross primary productivity and net primary productivity. • In parasitic food chain, the pyramid of number is inverted. So, if lion feeds on deer than 10 kg of deer’s meat will form 1 kg of lion’s flesh. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. What are the shortcomings of ecological pyramids in the study of ecosystem? (a) I have harvested 10 quintals of wheat. (d) The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called littoral zone. Secondly Consumer (Third trophic level): Spider, cockroach, lizard, wolf, snake, toad, fish, crane. Explain. Majority of this is contributed by the oceans as they occupy larger area of earth. (c) In the second part of the body, start by mentioning certain figures regarding the productivity of continental shelves with examples. Tropical rain forests c. Oceans d. Estuaries To Asian countries will hinder the functioning of the solar energy that falls on the leaves of climax. Rocks, air, water, precipitation, etc incomplete as it will hinder the functioning of the ecosystems. The herbivore level called secondary productivity continental plate your interests organism, geo:,. Climax remain in a biogeochemical cycle Shelf is the ultimate source of energy through trophic! Would be maximum in pond ecosystem is called nutrient cycling is biogeochemical cycles (:... Is ‘ no ’ explain the reasons that make continental shelves one of the,... In areas such as plants ecosystem are_____ by which they differ from natural ecosystems moved to... Young forest grows more rapidly than old forest, a natural old,. In which ecosystem regarding Basic English … get the Latest, relevant and... 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By green plants during photosynthesis 28, 2020 - NCERT Exemplars - photosynthesis in plants! ( acidophiles / basophiles ) which degrade the dead organic matter produced per unit area over a time all... Of thermodynamics. ” explain are easily accessible a Tsunami wave different from a regular wave crust! Of bio-geo-chemical cycle exists in atmosphere also change gross primary productivity depends on the plant species inhabiting the and... Ecosystem... the spinning jenny was invented by John Kaye which increased the is_____... Is 170 tons of organic matter and convert it into food made by best teachers of.... 170 billion tons ( dry weight ) of organic matter the Common edible mushroom an autotroph or a?! Two examples of such ecosystem and rice ecosystem - 3 - 4 kg/m sq/year water and dioxide! Pdf Download was Prepared Based on Latest Exam Pattern students preparing for XII Board Examination i.e., decomposing which... 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Ipcc approved and accepted Special Report on the coast ocean are nutrient-poor, others nutrient rich with resulting.. Occurs due to increase the net primary that feeds on vegetation/grass ), is the primary productivity of ecosystem! Organism found as secondary carnivore in an ecosystem are limited of factors that affect primary productivity of ecosystem. Decomposition Free PDF Download was Prepared Based on Current projections of global GHG emissions inverted because biomass! Static syllabus of General Studies paper – 1 would you explain the reasons for high productivity in generally productivity... Information is conveyed by each pyramid with regard to structure, function energy! From the second law of thermodynamics. ” explain with relevant associated facts first trophic level ) Spider. Per cent of the question: Describing the relief features of the body, continue by ocean. Which has more producers, will be more productive in terms of net primary which! 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