CBSE Class XII Biology HOTs Questions Database for chapter Environmental Issues. Based on CBSE and CCE guidelines. The students should practice these HOTs Questions to gain perfection which will help him to get more marks in CBSE examination. Based on CBSE and CCE guidelines. Based on the same pattern as released by CBSE every year. CBSE releases HOTs Questions every year. These papers are released prior to the CBSE board examinations so that students can do practice. database of 1 marks, 2 marks, 3 marks and 5 marks questions.
Chapter16. ENVIRONMENTAL ISSUES
1) Eutrophication due to growth of algal bloom. 1
Ans.1) Global warming due to the increase in conc. of green house gases It can be checked by. (Any 2)
i) Growing more trees (afforestation)
ii) Reduce the use of fossil Fuel iii) Prevent deforestation
Q.2) Integrated organic forming is a cyclical zero waste procedure. Justify. 3
Ans.2) Integrated organic farming is a cyclical zero waste procedure_
a) Waste products from one process are cycled in as nutrients for the other process.
b) There is no need for chemical fertilizers as cattle excreta are used as manure.
c) Crop waste is used to create compost, which is used as manure to generate electricity.
Ans.3) Human excreta are also recycled into manure which reduces the use of chemical fertilizers.
Ans 1) a) a- collection plate b- Dirty air
c-discharge corona d-Clean air 2
B) i) The electrode wires are maintained in several thousand volts, which produces corona that releases electron. 1
ii) Those electrons attach a dust giving negative charge. ½
iii) The collecting plates attract the charged dust particles ½
C) The electrostatic precipitator removes the particulate matter where as the scrubber removes the gases like SO2.
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