Minerals are essential for photosynthesis. Continental Shelf is the gently sloping seaward extension of continental plate. The biodiversity increases when one moves from the pioneer to the climax stage. Answer. SROCC summarises the disastrous impacts of warming based on current projections of global GHG emissions. Saprotrophs iv. The regrowth of forest is called secondary succession. An ecosystem is a functional unit of nature, where living organisms interact among themselves and also with the surrounding physical environment. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Aquarium has all the biotic and abiotic components of an ecosystem, so, aquarium is a complete ecosystem. (c) All top carnivore population is removed have to have input of nutrients via plant/animal waste, fertilizers, etc. Answer. 7. (a) I have harvested 10 quintals of wheat. The amount of energy accumulation in green plants through the process of photosynthesis is termed as primary productivity. Transfer of energy in an ecosystem follow 10% law, i.e., only 10% energy is transferred from one trophic level to higher trophic level. In climax community the P/R ratio will be 1. Answer. Given below is a list of autotrophs and heterotrophs. 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 … (c) Desert (d) Mangrove (d) All of the above Answer. P/R (Production/Respiration) ratio shows the relationship between gross production and respiration. There is one ‘world ocean,’ but researchers often consider it five: the Pacific, Atlantic, Indian, Arctic, and Southern oceans. Answer. Justify the following statement in terms of ecosystem dynamics. They fulfil their energy requirement by feeding on dead remains of plants and animals through the process of decomsposition. Discuss the main reason for the low productivity of ocean with your teacher. ... Upright pyramid is the norm in a terrestrial ecosystem, while inverted pyramid is found in ocean ecosystem. 7. movement of large volumes of water (vertical and horizontal ocean currents), type and distribution of marine organisms at various depths of oceans, climate of coastal lands, etc. Describing the relief features of the ocean floor and stating the reasons of high productivity of continental shelves. ncert exercise solution class 12 biology structure and function of ecosystem ... the limiting factor for the productivity is_____. And if your answer is ‘no’ explain the meaning of each expression. (c) I have harvested 10 quintals of wheat in one acre of land, 6 months after sowing. 15. (d) Not influenced by the physical environment i. The three ecological pyramids that are usually studied are (a) pyramid of number (b) pyramid of biortiass and (c) pyramid of energy. CBSE NCERT Solutions for Class 12 Science Chapter 14 . Here we have given NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem. Answer. All solutions are explained using step-by-step approach. High productivity ecosystems: The daily productivity depends upon the types of producers. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis? Discuss the main reason for the low productivity of ocean with your teacher. Which of the following ecosystems is most productive in terms of net primary . Answer It is defined as the amount of organic matter or biomass produced by producers per unit area over a period of time. These changes are orderly and sequential parallel with the changes in the physical environment. Choose the correct answer: If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be Insights has redefined the way preparation is done in UPSC civil service exam, Nanda Ashirwad Complex, 3rd Floor, The ecosystem which has more producers, will be more productive in terms of primary productivity. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. thus, oceans are low productivity ecosystems. 8. Grassland
2. 2. 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. 8. Ocean water is not as mineral rich as the land. Answer. • Any calculations of energy content, biomass, or numbers has to include all organisms at that trophic level. • Nature tends to increase the gross primary productivity so that it can utilise much of the solar energy and convert it into food. However, these vegetational changes in turn affect food and shelter for various types of animals. The process of mineralisation by micro organisms helps in the release of Source of Heat in Oceans. (a) In this statement farmer gives information of only the quantity of the wheat but area and time period is not given. Description of ecological succession usually focuses on changes in vegetation. An ecosystem is a functional unit with biotic and abiotic factors interacting • Pyramid of number in grassland or forest or pond ecosystem is upright. 14.3 DECOMPOSITION Rest of course, is on land. In the first half of the body, continue by explaining ocean relief. ; Continental Shelf of all oceans together cover 7.5% of the total area of the oceans. 8. We hope the NCERT Exemplar Class 12 Biology Chapter 14 Ecosystem help you. 14. 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. • Desertification. In the second part of the body, start by mentioning certain figures regarding the productivity of continental shelves with examples. (c) In aquatic ecosystems, the limiting factor for the productivity is _____. Answer. The biomass generation in secondary productivity is driven by the transfer of organic compounds between trophic levels through feeding. Answer. Due to hunting of tiger its population decreases, hence the population of deer (prey) increases and interspecific competition occurs between them. 13. Primary productivity of an ecosystem depends on the variety of environmental factors such as light, temperature, water, precipitation, etc. 11. 19. Decrease in rate of photosynthesis decreases the growth of aquatic plants and animals. 9. Ecosystem Important Questions for CBSE Class 12 Biology Ecosystem-Structure and Function, Productivity and Decomposition. 1. When the productivity increases, the pace of growth is automatically accelerated. Outline the relief of the ocean floor. 18. Of this, despite occupying about 70 per cent of the surface, the productivity of the oceans are only 55 billion tons. (a) Cycling of nutrients (c) In this statement farmer gives information of primary productivity that is quantity, area and time period all are given. Arrange the following as observed in vertical stratification of a forest: Grass, Shrubby plants, Teak, Amaranths The primary productivity on land is 115 billion tons. Poaching (hunting) of tiger disturbs the ecological balance in ecosystem. 14. 14.3 DECOMPOSITION You may have heard of the earthworm being referred to … (c) Sulphur (d) All of the above Practice Ecosystem questions and become a master of concepts. 170 billion tons (dry weight) of organic matter. Help students prepare for their CBSE exams actual means primary productivity and net primary is. The role of the oceans are least productive because they do not receive sufficient sunlight which is necessary for productivity. A detailed account as to how and why it occurred, or numbers has to include all at... Hunting of tiger is a resultant of the surface area would be the reason for the productivity... Certain figures regarding the productivity is_____ the total area of the net primary solve NCERT Class 12 Chapter Wise Answers. 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