{"id":39755,"date":"2023-01-19T10:00:27","date_gmt":"2023-01-19T04:30:27","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=39755"},"modified":"2023-01-20T09:42:41","modified_gmt":"2023-01-20T04:12:41","slug":"plus-two-botany-chapter-wise-previous-questions-chapter-7","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/plus-two-botany-chapter-wise-previous-questions-chapter-7\/","title":{"rendered":"Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem"},"content":{"rendered":"

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem<\/h2>\n

Question 1.
\nDuring a study tour teacher showed the primary colonisers on the banks of the river \u2018Nila\u2019.(MARCH-2010)<\/span>
\na) Identify the succession and justify your answer.
\nb) List the different stages of the identified succession.
\nAnswer:
\nSuccession taking place in water is called Hydrarch .
\nb) Phytoplankton stage -> Submerged plant stage -> Submerged free floating plant stage -> Reed swamp stage -> Marsh meadow -> Scrub stage -> Forest stage<\/p>\n

Question 2.
\nWhile learning trophic levels in class-room, teacher asked you to explain \u2018standing crop\u2019 to Raman. Explain.\u00a0(MARCH-2010)<\/span>
\nAnswer:
\nStanding crop –<\/strong> The mass of living material present in each trophic level.<\/p>\n

Question 3.
\nPond is a self-sustainable unit. Some organisms related to pond ecosystem is listed below, tadpole, fish, water, plants, kingfisher.\u00a0(MAY-2010)<\/span>
\na) Construct a food chain with the listed organisms.
\nb) Explain trophic level.
\nc) Point out trophic level of each organism in the constructed food chain.
\nd) Name interconnection of food chains in nature.
\nOR<\/strong>
\nTwo students, Unni and Kannan studied inter specific interactions between different species. They made a table assigning a ‘+\u2019 for beneficial interaction, for detrimental and \u20180\u2019 for neutral interaction. Can you help them by naming the interaction between species in different cases ? Write one example for each interaction.<\/p>\n\n\n\n\n\n\n\n
Case number<\/strong><\/td>\nSpecies A<\/strong><\/td>\nSpecies B<\/strong><\/td>\n<\/tr>\n
1.<\/td>\n+<\/td>\n+<\/td>\n<\/tr>\n
2.<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
3.<\/td>\n+<\/td>\n–<\/td>\n<\/tr>\n
4.<\/td>\n+<\/td>\n0<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Answer:
\nWater plants Tadpole -> Fish -> Kingfisher
\nb) Specific place of an organism in the food chain based on the source of nutrition or food.
\nc)
\n\"Plus
\nd) Food web
\nOR<\/strong>
\n1-Mutualism Eg; Lichen
\n2-Competition
\nEg: Competition for food (Phytoplankton) between Flamingoes and fishes
\n3 – Predation Eg: Lion and Deer
\n4 – Commensalism
\nEg: Epiphyte, Vanda and Mango tree<\/p>\n

Question 4.
\nConsider pond as an ecosystem showing the number of individuals in the following categories.\u00a0(MARCH-2011)<\/span>
\nCarnivores-2500, Producers-15000, Herbrivores- 5000
\na) Draw the pyramid of numbers in this ecosystem.
\nb) Comment on the energy flow in the ecosystem
\nAnswer:
\n\"Plus
\nb) Unidirectional flow of energy from producers to consumers. It decreases in successive trophic levels<\/p>\n

Question 5.
\nThe gradual change in the species composition of a given area leading to the formation of climax community is called ecological succession. In a rocky area,\u00a0(MARCH-2011)<\/span>
\na) What is the expected type of pioneer species?
\nb) How this pioneer species leads to the establishment of a stable climax community?(2 Scores)
\nAnswer:
\na) lichens
\nb) lichens -> mosses -> herbs -> shrubs ->forest.
\nThese are different stages and leads to stable climax community.<\/p>\n

Question 6.
\nFill up the blanks with appropriate terms in the given pyramid of trophic level:\u00a0(MAY-2011)<\/span>
\n\"Plus
\nAnswer:
\nb – Primary consumer a- secondary consumer<\/p>\n

Question 7.
\nKalyani wrote man, hen, earthworm, mango-tree in her note book. Arrange the terms in a food chain sequence. Explain food chain and name the types of food chain.\u00a0(MAY-2011)<\/span>
\nAnswer:
\nEarth worm\u2014> Hen \u2014> Man \u2014> Mango tree
\nThe transfer of food from the producers through a series of organisms with repeated eating and being eaten is referred to as Food chain Detritus food chain<\/p>\n

Question 8.
\nIn a marine ecosystem, a population of phytoplankton (150,000) supports a standing crop of fishes (40,000).\u00a0(MARCH-2012)<\/span>
\na) Draw the pyramid of biomass and
\nb) The pyramid of numbers in this ecosystem,
\nAnswer:
\na) Inverted Pyramid
\n\"Plus
\nb) Upright Pyramid
\n\"Plus<\/p>\n

Question 9.
\nThe gradual and fairly predictable changes in the species composition in an area is called ecological succession.\u00a0(MARCH-2012)<\/span>
\na) Name the pioneer species in the primary succession in water.
\nb) Give the sequence of events and climax community in the hydrarch succession.
\nAnswer:
\na) Phytoplankton
\nb) Phytoplankton -> submerged free floating -> Reed swamp marsh meadow -> scrub -> Forest.<\/p>\n

Question 10.
\nGiven number of individuals in a grassland ecosystem.\u00a0(MAY-2012)<\/span>
\nGrasshopper – 1500
\nGrass – 5,842,000
\nWolf – 28
\nBirds – 215
\na) Draw a pyramid of numbers showing various trophic levels.
\nb) Explain trophic level.
\nAnswer:
\n\"Plus
\nb) Each step in food chain is called trophic level<\/p>\n

Question 11.
\nRate of biomass production is called productivity and can be divided into GPP and NPP :\u00a0(MAY-2012)<\/span>
\na) Define GPP and NPP.
\nb) How can we relate GPP and NPP?
\nAnswer:
\na) GPP – Gross primary productivity NPP – Net primary productivity
\nb) NPP = GPP-R<\/p>\n

Question 12.
\nFinal community that is in near equilibrium with environment in ecological succession is called ________.\u00a0(MARCH-2013)<\/span>
\nAnswer:
\nClimax community<\/p>\n

Question 13.
\nNatural interlinked food chains are called _______.\u00a0(MARCH-2013)<\/span>
\nAnswer:
\nFood web<\/p>\n

Question 14.
\nA list of organisms are given. Place them in different trophic levels. Grass, Man, Fishes, Birds, Lion, Grasshopper, Zooplankton, Trees.\u00a0(MARCH-2013)<\/span>
\nAnswer:
\nFirst trophic level – trees,grass
\nSecond trophic level – grasshopper,zooplankton
\nThird trophic level – birds, fishes
\nFourth trophic level – lion ,man<\/p>\n

Question 15.
\nIn the equation, GPP-R = NPP; If NPP = Net primary productivity.\u00a0(MAY-2013)<\/span>
\nExplain GPP – R = NPP.
\nAnswer:
\nGross primary productivity minus respiration losses (R) is the net primary productivity (NPP).
\nThat means Net primary productivity is the available biomass for the consumption to heterotrophs (herbiviores and decomposers).<\/p>\n

Question 16.
\nTeacher, pointing to a forest said \u201c Long back, this place was a pond\u2019\u2019. This gradual change is an example of\u00a0(MAY-2013)<\/span>
\n1) Secondary succession
\n2) Xerarch succession
\n3) Pioneer species
\n4) Hydrarch succession
\nAnswer:
\nHydrarch succession<\/p>\n

Question 17.
\nThe species that invade a nude area are called ________ species. In a primary succession on rocks, the group that invade first are usually.\u00a0(MARCH-2014)<\/span>
\nAnswer:
\nPioneer species, Lichens<\/p>\n

Question 18.
\nThe rate of biomass production in an ecosystem is called productivity. They are of two types, gross primary productivity and net primary productivity, how these two productivities are related?\u00a0(MARCH-2014)<\/span>
\nAnswer:
\nGross primary productivity of an ecosystem is the rate of production of organic matterduring photosynthesis.
\nGross primary productivity minus respiration losses (R), is the net primary productivity (NPP).
\ni.e: GPP – R = NPP<\/p>\n

Question 19.
\nA list of different organisms in an ecosystem are given below.\u00a0(MARCH-2014)<\/span>
\nArrange them in 1st, 2nd, 3rd and 4th trophic level,
\ni) Phytoplankton
\nii) Man
\niii) Fish
\niv) Zooplankton
\nAnswer:
\n\"Plus<\/p>\n

Question 20.
\nBy observing the relationship of the first pair fill up the blanks:\u00a0(MAY-2014)<\/span>
\na) Grazing food chain consists of producers and consumers whereas Detritus chain comprises dead organic matter and ______.
\nb) Nitrogen : Gaseous cycle
\nSulphur: _______
\nAnswer:
\na) Detrivores
\nb) Sedimentary cycle<\/p>\n

Question 21.
\nField survey by a team of students recorded the following data related to biomass of the organisms in each tropic level of an ecosystem. Draw, name and explain the pyramid\u00a0(MAY-2014)<\/span>
\nAnswer:
\n\"Plus
\nBiomass increases in successive trophic levels hence the pyramid given here is inverted.<\/p>\n

Question 22.
\nGradual, sequential changes of a given area including species composition is known as ecological succession. If so name the first two stages of the succession in hydricarea.\u00a0(MAY-2014)<\/span>
\nAnswer:
\n1) phytoplankton stage
\n2) submerged plant stage<\/p>\n

Question 23.
\nPrimary succession on rocks is known as Xerosere. Answer the following related with Xerosere.\u00a0(MARCH-2015)<\/span>
\na) Name the pioneer community.
\nb) Organic acids have important roles in this succession. Justify.
\nAnswer:
\na) Lichen
\nb) It helps in weathering of rocks and soil formation<\/p>\n

Question 24.
\nBy observing the relationship of the first pair fills up the blanks.\u00a0(MAY-2015)<\/span>
\na) Net primary productivity =
\nGross primary productivity \u2014 Respiration.
\nGross primary productivity is ________.
\nb) Carbon: Gaseous cycle
\nPhosphorus: ______.
\nAnswer:
\na) total organic matter
\nb) sedimentary cycle<\/p>\n

Question 25.
\nField survey by a team of students recorded the following data related to number of organisms in an ecosystem and plotted that into a figure shown below:\u00a0(MAY-2015)<\/span>
\n\"Plus
\nObserve the figure and explain the pyramid.
\nAnswer:
\nIt is the inverted pyramid . In this number of organism increases in the successive trophic levels.<\/p>\n

Question 26.
\nHydrosere succession stages are given below. Arrange them in order.\u00a0(MAY-2015)<\/span>
\nScrub stage \u2014 forest \u2014submerged free floating \u2014 Marsh Meadow \u2014Submerged stage \u2014Reed swamp\u2014Phytopiankton.
\nAnswer:
\nPhytoplankton- submerged-submerged free floating- reed swamp -Marsh meadow -srub stage – forest.<\/p>\n

Question 27.
\nNutrients are never lost from the ecosystems and are recycled. Write about.\u00a0(MARCH-2016)<\/span>
\na) Gaseous cycle
\nb) Sedimentary cycle
\nAnswer:
\na) Gaseous cycle-<\/strong> The reservoir of gaseous type nutrients are present in atmosphere
\nb) Sedimentary cycle-<\/strong> The reservoir of nutrients are present in earth crust<\/p>\n

Question 28.
\nEcological pyramids are usually upright. Meanwhile some, pyramid of biomass is inverted. Explain the reason.\u00a0(MARCH-2016)<\/span>
\nAnswer:
\nPyramid of biomass of sea is inverted because biomass of fishes far exceeds phytoplankton<\/p>\n

Question 29.
\na) Biogeochemical cycle is an important phenomenon in very ecosystem. Describe phosphorus cycle.\u00a0(MAY-2016)<\/span>
\nOR<\/strong>
\nb) The plant communities in a given area show successive changes. Mention the stages of succession in a xerosere.
\nAnswer:
\na) The cycle consists of following steps.
\n\"Plus
\nOR<\/strong>
\nb) In xerach succession first plant communities appear in bare area are lichens,They secrete
\ncarbonic acid and dissolve rocks. This process forms soil that help in the growth of mosses. Then herbs,shrubs and forest stage appears .this process takes thousands of years and form climax community.<\/p>\n

Question 30.
\nEarthworms are commonly referred as farmers\u2019 friends. Define fragmentation.\u00a0(MAY-2016)<\/span>
\nAnswer:
\nDuring fragmentation large detritus (dead remains of plants & animals) is converted into into smaller particle by the detritrivores like earthworm, its surface area increases that helps in process, of decomposition.<\/p>\n

Question 31.
\nThe different stages of primary succession in water are represented below. Fill the gaps that are unfilled.\u00a0(MARCH-2017)<\/span>
\na) Phytoplankton
\nb) _______
\nc) Submerged free floating plant stage
\nd) _______
\ne)________
\nf) Shrub stage
\ng) _______
\nAnswer:
\na) phytoplankton stage.
\nb) Submerged plant stage.
\nc) Submerged free floating plant Stage
\nd) Reed swamp stage.
\nf) Marsh – meadow stage
\ng) Scrub stage.
\nh) Forest stage<\/p>\n

Question 32.
\nAn ecosystem consist of the following population:\u00a0(MARCH-2017)<\/span>
\nPhytoplankton
\nMan
\nFish
\nZooplankton
\nDraw a food chain denoting each trophic level
\nAnswer:
\n\"Plus<\/p>\n

Question 33.
\nThe natural reservoir of phosphorous is rock where it is present in the form of phosphates. How this phosphorous is cycled in ecosystem?\u00a0(MAY-2017)<\/span>
\nAnswer:
\nThe reservoir of phosphorus is rock. During weathering process orthophosphates reaches the soil solution. It is taken by plants, that passes through food chain and reaches animals. After the death and decay, the organic form of phosphorus is coming into the soil solution as orthophosphates by the activity of phosphate solubilising bacteria.<\/p>\n

Question 34.
\nBirds represent members in a food chain.\u00a0(MAY-2017)<\/span>
\nDraw a food chain representing each of the above in different tropic levels.
\nAnswer:
\n\"Plus<\/p>\n

Plus Two Botany Chapter Wise Previous Questions and Answers<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"

Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem Question 1. During a study tour teacher showed the primary colonisers on the banks of the river \u2018Nila\u2019.(MARCH-2010) a) Identify the succession and justify your answer. b) List the different stages of the identified succession. Answer: Succession taking place in water is called Hydrarch […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[42728],"tags":[],"yoast_head":"\nPlus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem - A Plus Topper<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aplustopper.com\/plus-two-botany-chapter-wise-previous-questions-chapter-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem\" \/>\n<meta property=\"og:description\" content=\"Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 7 Ecosystem Question 1. During a study tour teacher showed the primary colonisers on the banks of the river \u2018Nila\u2019.(MARCH-2010) a) Identify the succession and justify your answer. b) List the different stages of the identified succession. 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During a study tour teacher showed the primary colonisers on the banks of the river \u2018Nila\u2019.(MARCH-2010) a) Identify the succession and justify your answer. b) List the different stages of the identified succession. 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