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9/29/2020 BOTONY/BIO-BOTONY QUESTIONS ANSWER KEY TYPE-A Class : 12th STD Date : 29-09-2020 Subject: NEW BHARATH MATRIC HR SEC SCHOOL Time : 2.30 Hrs BOTONY/BIO- THIRUVARUR Roll No: BOTONY Maximum Marks: 64 Question : Type A UNIT TEST Instructions: (i) Check the question paper for fairness of printing. If there is any lack of fairness, inform the hall supervisor immediately. (ii) Use Black or Blue ink to write and pencil to draw diagram PART - I 32 X 2 = 64 ANSWER ALL QUESTIONS ARE IN COMPULSORY. 1. What is ozone hole? * &nbs The ozone shield is being damaged by chemicals released on the Earths surface notably the chlorofluorocarbons widely used in refrigeration,aerosols, chemicals used as cleaners in many industries.The decline in the thickness of the ozone layer over restricted area is called Ozone hole. 2. Give four example of plants cultivated in commercial agroforestry? The major species cultivated in commercial Agroforestry include casuarina, Eucalyptus,Malai vembu, Teak and Kadambu trees which were among the 20 species identified as commercial timber.They are of great importance to wood-based industries. 3. Expand CCS. carbon capture and storage 4. How do sacred groves help in the conservation of biodiversity? i) These are the patches or grove of cultivated trees which are community protected and are based on strong religious belief systems which usually have a significant religious connotation for protecting community. ii) 448 grooves were documented throughout Tamil Nadu.Ex: Banagudi shola. iii) These groves provide a number of ecosystem services to the neighbourhood like protecting watershed, fodder medicinal plants and micro climate control. 5. What are green house gases? The gases the capture heat are called green house gases which include CO2 methane N2O and a varity of manufactured chemical like choloroflurocarbon 6. What is global warming? studyseeds.com/admin/get-question 1/5 9/29/2020 BOTONY/BIO-BOTONY The increase in mean global temperature due to increased concentration of green house gases is called global warming. 7. Write tow effects of global warming? i) Biological diverrsity may get modified some species ranges get refind ii) There will be a drastic change in weather patterns bringing more floods of droughts in some areas. 8. What are the sources of green house gases emission? The sources of green house gases emission are i) Buring fossil fuels, which release CO2 and CH4. ii) Way of Acriculture and animal husbandry practices. iii) Electical gadgets like refrigerator and air conditioners release chlor fluoro carbons. iv) The fertilizers used in Agriculture which release N2O. v) The emission from automobiles. 9. What is an Ozone shield? i)Ozone layer is a region of Earths sstratosphere that absorbs most of the suns ultra violet radiation. ii) The ozone layer is also called are the ozone shield and it acts as a protective shield cutting the ultra- violet radiation emitted by the sun, 10. What are Bad and Good Ozone? The ozone layer of the troposphere is called bad ozone and the ozone layer of stratosphere is known as good ozone because this layer acts as a shield for absorbing the UV raditions coming from the sun which is harmful for living organisms. 11. Write the expansion of CDM? The expansion fo CDM is Clean Development Mechanism 12. What are plant Indicators? i) The presence or absence of certain plantss indicate the state of environment by their response. ii) It is referred to as biological indicators of phytoindicators or plant indicators. Example: Lichenis indicate SO2 pollution.. 13. Define silvopasture system? The production of woody plants combined with pasture is reffered as silvopasture system. 14. What is meant by Deforestation? The conversion of forested area into a non-forested are is known as deforestation. 15. Expand IUCN? studyseeds.com/admin/get-question 2/5 9/29/2020 BOTONY/BIO-BOTONY Ineternational Union for Conservation of Nature (Founded in 1948). 16. What is Biochar? i) To increase plants ability to store more carbon plants are partly burnt such as corp waste,waste woods to become carbon rich slow decomposing substance of material called Biochar. ii) It is a kind of charcoal used as a soil amendment. iii) Biochar is a stable solid, rich carbon and can endure in soil for thousand of years. 17. Write the names of important lakes in and around chennai. i) Sholavaram lake ii) Chembarampakkam lake iii) Maduranthakam lake 18. What is GIS and write is expansion? GIS is a computer system for capturing storing checking adn displaying date related to position on Earth surface. GIS is Geographic Information System. 19. What is the importance of GIS? i) Environmental impact assesment ii) Management of Natural resources iii) soil mapping 20. What are the uses of Remote Sensing? i) Mapping of forest fire and species distribution ii) Mapping ocean bottom and its resources 21. Define the term Algal bloom? Sudden sprout of algal growth which can affect the water quality adve and indicaate potentially hazardous changes in local water chemistry 22. Write the three stages involved in sewage Treatment? Sewage treatment generally involves three stages called primary secondary and tertiary treatment. 23. Write tow benefits of Rainwater Harvesting? i) Improves ground water quality and water table ii) Reduce flood hazards 24. What are endemic species? Endemic species are plants and animal that exist only in one geographical region or any species found restricted to a specified geographical area,, Example: Nepenthes Khasiyana-Endemic to Khasi hills, Meghalaya studyseeds.com/admin/get-question 3/5 9/29/2020 BOTONY/BIO-BOTONY 25. Give the name of any two endemic plants? i) Hardwickia binata-Endemic to peninsular and North India ii) Nepenthes Khasiyana-Endemic to Khasi hills, Meghalaya. 26. Write the slogan fo fivers sin chipko movement? Food, Fodder, Fuel, Fibre, Fertilizer. 27. What is an Agroforestry? Agroforestry is an integration of trees,crops and livestock on the same plot of land. The main objective is one the interaction among them 28. What is social forestry? It referes to the management of forests and afforestation on barren lands with the purpose of helping the environment social and rural development and benefits. 29. Write any two effects of global warming on plants? i) Low agricultural productivity in tropics ii) Increase of vectors and epidemics iii) Change in flowering seasons 30. Give an example of plants cultivated in commercial agroforestry? i) Alacia nilofica ii) Sesbania grandiflora iii) Albizzia lebbek iv) Gliricidia sepiuum 31. Expand CFP? Carbon Foot Print 32. What is Bio-magnification?' Pollutants toxis substance increase in water move from one food cahin to many and finally reach human being and this process of bio-amplification ro increase in concentration is called bio-magnification. 33. Suggest a solution to water crisis and explain its advantages? studyseeds.com/admin/get-question 4/5 9/29/2020 BOTONY/BIO-BOTONY studyseeds.com/admin/get-question 5/5.