(d) Inorganic nutrients from detritus and formation of humus. (c) Free-floating hydrophytes, sedges, phytoplankton, rooted hydrophytes, grasses and trees tropics with its hot and humid.climaticcondition provides an environment which is ideal for the microbes to speed up the process of decomposition. Ocean, continuous body of salt water held in enormous basins on Earth’s surface. 15. Explain. (a) 1% (b) 10% (c) 40% (d) 90% Answer. • In parasitic food chain, the pyramid of number is inverted. Oceans are least productive because they do not receive sufficient sunlight which is necessary for 1° productivity. 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 Answer. Saprotrophs iv. The rate of succession is much faster in secondary succession as the substratum (soil) is already present as compared to primary succession where the process starts from a bare area (rock). 1. Oceans occupy about 70 per cent of the surface. 8. 7. Answer. 6. 13. Primary productivity can be divided into - gross primary productivity (GPP) and net primary productivity … It is expressed in terms of weight (g/m 2 /yr) or energy (kcal/m 2 /yr). This can happen in cases of forest fires, landslides, changes in soil characteristics, increase in herbivore population leading to overgrazing. China also leads in production of lead, antimony and tungsten. Climax stage is achieved quickly in secondary succession as compared to primary succession. Dec 28, 2020 - NCERT Exemplars - Photosynthesis in Higher Plants Notes | EduRev is made by best teachers of NEET. If currents and tides don't bring these into an area, then life suffers proportionally. Multiple Choice Questions When it comes to NCERT books, it certainly has an edge over other books in the market. • Overgrazing by herbivores Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. What will happen to an ecosystem if: Catfish/water snake etc. Top carnivore (Fourth trophic level): Lion, Tiger. Climax community is in a state of 2. Class 11 English Chapter 5 The Ailing Planet: the Green Movement's Role Questions with Solutions to help you to revise complete Syllabus and Score More marks in your examinations. Given below is a list of autotrophs and heterotrophs. The annual productivity of the entire ocean is estimated to be approximately 50 × 10 15 grams (50 × 10 9 metric tons) of carbon per year, which is about half of the global total. (d) Not influenced by the physical environment Under what conditions would a particular stage in the process of succession revert back to an earlier stage? 3. Poaching (hunting) of tiger disturbs the ecological balance in ecosystem. all living things need nutrients. The sequence of communities of primary succession in water is 12. The movement of nutrient elements through the various components of an ecosystem is called nutrient cycling. 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. (a) Plants are called as _____ because they fix carbon dioxide. Oceans are least productive because they do not receive sufficient sunlight which is necessary for 1° productivity. i. Autotrophs ii. Why are nutrient cycles in nature called biogeochemical cycles? Conclude by further summarising the overall economic importance of continental shelves. For the sedimentary cycle (e.g., sulphur and phosphorus cycle), the reservoir is located in Earth’s crust. Answer. 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. Explain – Clarify the topic by giving a detailed account as to how and why it occurred, or what is the particular context. A farmer harvests his crop and expresses his harvest in three different ways. Attiguppe , Bengaluru - 560040. Answer. What does the base tier of the ecological pyramid represent? Also a given organism may occupy more than one trophic level simultaneously. (a). (c) In aquatic ecosystems, the limiting factor for the productivity is _____. Description of ecological succession usually focuses on changes in vegetation. • Among the grassland, pond and forest ecosystem, the number of primary producers per unit area would be maximum in pond ecosystem. (b) Spirogyra, Volvox and Nostoc are producers. The annual net primary productivity of the whole biosphere is approx. Productivity is the rate of production of biomass expressed in terms of Answer. What could be the explanation? (a) Orderly and sequential Continental shelves are shallow areas of ocean where minerals from the land mass below are easily accessible. In an ecosystem dominated by trees, the pyramid of number is spindle shaped/inverted. Which of the following is not a producer? 4. What is common to earthworm, mushroom, soil mites and dung beetle in an ecosystem. (a) ii (b) iii (c) iiandiv (d) i and iii 14.3 DECOMPOSITION You may have heard of … Aquarium has all the biotic and abiotic components of an ecosystem, so, aquarium is a complete ecosystem. Answer. Need any support from our end during the preparation of Minerals and Energy Resources Class 10 MCQs Multiple Choice Questions with Answers then leave your comments below. Among the following bio-geo-chemical cycles which one does not have losses due to respiration? (c) Pyramid of number in grassland or forest or pond ecosystem is upright. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. What will be the P/R ratio of a climax community and a pioneer community? SROCC summarises the disastrous impacts of warming based on current projections of global GHG emissions. What implication would this activity have on the functioning of the ecosystem of which the tigers are an integral part? The regrowth of forest is called secondary succession. Answer. Organisms at a higher trophic level have less energy available. a. Deserts b. ; Continental Shelf of all oceans together cover 7.5% of the total area of the oceans. The rate of growth of microbes is affected by temperature. No, the meaning of above statements is different Variety of environmental factors. 12. ; The shelf typically ends at a very steep slope, called the shelf break. 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