It is expressed in terms of weight (g/m 2 /yr) or energy (kcal/m 2 /yr). This document is highly rated by NEET students and has been viewed 200 times. 20. 10. Whether it is the constant urge of outperforming our peers or the nature of the work that forces us into multitasking, the result is the same, lower productivity. Covering nearly 71 percent of Earth’s surface, the oceans have an average depth of … 1. e. urope. Heterotroph (as it does not have chlorophyll). (c) Disorder (d) Constant change Primary productivity varies from ecosystem to ecosystem because it depends on the plant species inhabiting the area and their photosynthetic activity. Decomposition is largely an oxygen requiring process. Attempt this first test only after going through NCERT textbooks of class 6 (all subject), 8 (only science) and 10 (all subjects). Answer. Do the above statements mean one and the same thing. Apart from plants and animals, microbes form a permanent biotic component in an ecosystem. 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Answer. (a) Pelagic zone (b) Benthic zone Primary productivity is the rate of biomass or organic matter produced per unit area over a time period by green plants during photosynthesis. Producers. A given species may occupy more than one trophic level in the same ecosystem at the same time; for example, a sparrow is a primary consumer when it eats seeds, fruits, peas, and a secondary consumer when it eats insects and worms. Give two examples of artificial or mail made ecosystems. If currents and tides don't bring these into an area, then life suffers proportionally. Calculate the net primary productivity of the ecosystem. (i) Desert ecosystem 1. (d) Not influenced by the physical environment Answer. The sun is the principal source of energy (Insolation). Of this, despite of occupying about 70% of the surface of earth, the productivity of the oceans are only 55 billion tons. Why is the rate of assimilation of energy at the herbivore level called secondary productivity? We hope the NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem help you. Explain in detail the mechanism of a Tsunami. Name an omnivore which occurs in both grazing food chain and the decomposer food chain. Answer. Rest of course, is on land. Minerals are essential for photosynthesis. The question is part of the static syllabus of General Studies paper – 1. It is expressed in terms of weight (g/m 2 /yr) or energy (kcal/m 2 /yr). ), 16. Answer. (c) Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees Answer. (b) Tropical rain forests ecosystems is most productive in terms of net primary production. The ecosystems occur in areas such as tropical forests, flood plains, coral reefs, areas of upwelling, sugarcane fields, etc. Students have to take the 11th exams seriously because they lay the foundation for a good score in 12th class and also to choose the right career path. ... the spinning jenny was invented by John Kaye which increased the productivity of the traditional spindles. Predator keeps prey population under control. 11. (b) Sandy areas (psammosere). ; Continental Shelf of all oceans together cover 7.5% of the total area of the oceans. Among the following bio-geo-chemical cycles which one does not have losses due to respiration? Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? Answer. (ii) Name any plant that is characteristic of such ecosystem. This energy is passed on through successive trophic levels in the food chain. Catfish/water snake etc. 2. What is this inter-linkage established known as? iii. Grassland
2. (c) I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing. What explanation could you offer for the changes seen in P/R ratio of a pioneer community and the climax community? It is chlorophyllous and is thus capable of photosynthesis. (a) All producers are removed; 1. Answer. And if your answer is ‘no’ explain the meaning of each expression. Examples of such an ecosystem can be a fish tank or deep aphotic zone of the oceans where producers are absent. 18. 16. Explain the reasons that make continental shelves one of the highly productive ecosystems. The regrowth of forest is called secondary succession. Answer. Answer. Heterotrophs a. Deserts b. Name an organism found as secondary carnivore in an aquatic ecosystem. Discuss. The zone at the edge of a. lake or ocean which is alternatively exposed to air and immersed in water is called Answer. Natural ecosystem self sustains biotic and abiotic components of an ecosystem. Insights has redefined the way preparation is done in UPSC civil service exam, Nanda Ashirwad Complex, 3rd Floor, Explain. It is of two types : gross primary productivity and net primary productivity. Crustose lichens. 8. Plant life in the world’s oceans has become less productive since the early 1980s, absorbing less carbon, which may in turn impact the Earth’s carbon cycle. iii. So, higher trophic level have less energy as- compared to lower trophic level. “Nature tends to increase the gross primary productivity, while man tends to increase the net primary productivity”. leading tin producers. Primary Consumer (Second trophic level): Crustaceans, grasshopper, deer, mouse, squirrel, rabbit, elephant, goat. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 14 Ecosystem. (a) Non-equilibrium (b) Equilibrium Pyramid of Number Answer. Human activities have significantly influenced the carbon cycle. Discuss the main reason for the low productivity of ocean with your teacher. (c) Increase in number of herbivores Sunlight (solar radiation), 12. Desert
4. Answer. Man and sparrow ete. Why the question: The question is part of the static syllabus of General Studies paper – 1. Decrease in rate of photosynthesis decreases the growth of aquatic plants and animals. D degree under his supervision and moved on to other universities and research institutes to initiate ecology teaching and research across the country. (c) Ether upright or inverted (d) Neither upright nor inverted ; The shelf typically ends at a very steep slope, called the shelf break. How do the microbes fulfil their energy requirements? Misra formulated the first postgraduate course in ecology in India. SROCC summarises the disastrous impacts of warming based on current projections of global GHG emissions. It is expressed in terms of weight per year or energy per year Ex- The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter In climax community the P/R ratio will be 1. production? Edaphic factor refers to some areas of ocean are nutrient-poor, others nutrient rich with resulting productivity. Answer. 14.3 DECOMPOSITION Long Answer Type Questions Arrange the following as observed in vertical stratification of a forest: Grass, Shrubby plants, Teak, Amaranths What could be the explanation? Justify the pitcher plant as a producer. Primary Productivity refers to the generation of biomass from autotrophic organisms such as plants. Comment. 11. Continental Shelf. According to science, it is one of the habits one should stop doing if the person actually wants to be productive. (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. Many people are surprised to learn, however, that roughly half of this productivity occurs in the oceans and is conducted by microscopic plants called phytoplankton. As we move higher up in the food chain the amount of energy diminishes to a level at which it cannot sustain any trophic level, thereby limiting the number of trophic levels. have to have input of nutrients via plant/animal waste, fertilizers, etc. This can be concluded from the fact that productivity in oceans is high where there is up-welling of mineral rich water or near continental shelves. Multiple Choice Questions 40. 11. • In Grassland ecosystem only 3 top carnivores are supported in an ecosystem based on production of nearly 6 million plants. Also after the chapter, you can get links to Class 12 Biology Notes, NCERT Solutions, Important Question, Practice Papers etc. Explain. accommodate food webs. 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. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Give any two examples of xerarch succession. (c) All top carnivore population is removed (a) ii (b) iii (c) iiandiv (d) i and iii The ecological pyramid assumes a simple food chain and does not The currents are responsible for increasing or decreasing marine organisms on the coast. (b) Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis 2-10%. Tigers are important predator of forest. Get NCERT Exemplar Solutions for Class 12 Chapter Ecosystem here. Candidates can download NCERT Exemplar Class 12 Biology Chapter 14 from this page. Climax stage is achieved quickly in secondary succession as compared to primary succession. 7. productivity owing to the training. Why are nutrient cycles in nature called biogeochemical cycles? Microbes are referred to as heterotrophs and saprotrophs. Secondly Consumer (Third trophic level): Spider, cockroach, lizard, wolf, snake, toad, fish, crane. 13. Discuss in detail the reasons for high productivity of the continental shelves like high nuritent loads, vertical stability and shallowness etc. In the successive serai stages there is a change in the diversity of species of organisms, increase in the number of species and organisms as well as an • increase in the total biomass. Answer. Oceans occupy about 70 per cent of the surface. 3. People migrate in search of jobs that fetch them higher salaries than what they may get in … On this earth only the photosynthetic organisms have the ability to utilize radiant energy and manufacture organic substances using water and carbon dioxide. (b) In terrestrial ecosystem pyramid of biomass is generally upright. Primary productivity varies from ecosystem to ecosystem. Answer. 8. Answer. Outline the major divisions of the relief floor and describe them. Gross primary productivity of an ecosystem is 170 tons of organic matted and amount used in respiration is 50 tons. But the primary productivity of the oceans are only 55 billion tons. Primary Productivity; Secondary Productivity; Primary Productivity. Rest of course, is on land. The annual net primary productivity of the whole biosphere is approx. The annual net primary productivity of the whole biosphere is approx. Answer. Aquarium has all the biotic and abiotic components of an ecosystem, so, aquarium is a complete ecosystem. (c) Productivity is the rate of production of biomass expressed in terms of g-1yr-1 and (heal m-2) yr-1. Why is the rate of assimilation of energy at the herbivore level called secondary productivity? 3. They are all detritivores i.e., decomposing organisms which feed on dead remains of plants and animals. Answer. There is one ‘world ocean,’ but researchers often consider it five: the Pacific, Atlantic, Indian, Arctic, and Southern oceans. 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. 1. (b) The reservoir for the gaseous- type of bio-geo-chemical cycle exists in atmosphere. Absence of any component will make an ecosystem incomplete as it will hinder the functioning of the ecosystem. 170 billion tons(dry weight) of organic matter. (c) In aquatic ecosystems, the limiting factor for the productivity is _____. Answer. NCERT Exemplar Class 12 Biology is very important resource for students preparing for XII Board Examination. Answer. Answer. If your answer is yes, give reasons. Justify the following statement in terms of ecosystem dynamics. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. Is the common edible mushroom an autotroph or a heterotroph? 5. The zone at the edge of a. lake or ocean which is alternatively exposed to air and immersed … ... Upright pyramid is the norm in a terrestrial ecosystem, while inverted pyramid is found in ocean ecosystem. Natural or human induced disturbances like fire, deforestation etc. (b) Phytoplankton, free-floating hydrophytes, rooted hydrophytes, sedges, grasses and trees Students can solve NCERT Class 12 Biology Ecosystem MCQs Pdf with Answers to know their preparation level. The rate of decomposition of detritus is affected by the abiotic factors like availability of oxygen, pH of the soil substratum, temperature etc. (c) Desert (d) Mangrove Grass, Amaranths, Shrubby plants, Teak, 5. Production can occur under ice! Why? Which of the following is 1. The humus is further degraded by some microbes and release of inorganic nutrients occur by the process known as mineralisation. Sometimes due to biotic/abiotic factor the climax remain in a particular serai stage (pre climax) without reaching climax. Give brief description of factors that affect primary productivity. Answer. 15. (c) Organic nutrients from humus (d) Phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees (a) Scavenger (b) Tertiary producer Surat in Gujarat on the west coast of India was one of the most important ports of Indian Ocean trade in the seventeenth century. Primary productivity can be divided into - gross primary productivity (GPP) and net primary productivity … Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100 mm The three ecological pyramids that are usually studied are (a) pyramid of number (b) pyramid of biortiass and (c) pyramid of energy. The energy transfer in the food chain follows the 10 percent law where in only 10% of the energy is transferred from one trophic level to the next successively. CBSE NCERT Solutions for Class 12 Science Chapter 14 . 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. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part? If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be So, there is a decrease in the amount of energy available at the successive trophic levels. Rest of course, is on land. Thus, as succession proceeds, the numbers and types of animals and decomposers also change. Primary productivity is the amount of biomass or organic matter produced per unit area over a time period by plants during photosynthesis. 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