CBSE Class 12 Biology Environmental Issues Study Guide

Download CBSE Class 12 Biology Environmental Issues Study Guide in PDF format. All Revision notes for Class 12 Biology have been designed as per the latest syllabus and updated chapters given in your textbook for Biology in Standard 12. Our teachers have designed these concept notes for the benefit of Grade 12 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 12 Biology for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 12 Biology given our website

Environmental Issues Study Guide Class 12 Biology Revision Notes

Class 12 Biology students should refer to the following concepts and notes for Environmental Issues Study Guide in standard 12. These exam notes for Grade 12 Biology will be very useful for upcoming class tests and examinations and help you to score good marks

Environmental Issues Study Guide Notes Class 12 Biology

 

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ACCELERATED EUTROPHICATION :- The acceleration of aging process of water by human‘s activities like effluents from the industries and homes.

AGRO-CHEMICALS :- The chemicals used in agriculture such as inorganic fertilizers, pesticides, herbicides, fungicides etc. are called agro-chemicals.

ALGAL BLOOM :- Presence of large amount of nutrients in water that cause excessive growth of free floating algae.

Biochemical Oxygen Demand (BOD) :- The amount of the oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria.

BIOMAGNIFICATION :- The increase in concentration of the toxicant at successive trophic levels.

DESERTIFICATION :- When large barren patches of land extend and meet over time, a desert is created.

EUTROPHICATION :-The natural aging of a lake by Biological Enrichment of its water.  

• E-WASTE :- Irreparable computers and other electronic wastes
• GREEN HOUSE EFFECT :- The naturally occurring phenomenon that is responsible for heating of Earth‘s surface and atmosphere.
• INTEGRATED ORGANIC FARMING :-A Cyclical, zero waste procedure, where waste products from one process are cycled in as nutrients for other processes.
• MUNICIPAL SOLID WASTES :- The wastes from homes offices, stores, schools, hospital etc.
that are collected and disposed by municipality.
• NOISE :- The undesired high level of sound.
• POLLUTANTS :- Agents that bring about undesirable change in air, water land or soil are called pollutants.
• POLLUTION :- Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil.
• POLYBLEND :- A fine powder of recycled modified plastic.
• REFORESTATION :- The process of restoring a forest that once existed but was removed at same point of time in the past.
• SANITARY LANDFILLS :- The process in which wastes are dumped in a depression or trench after compaction and covered with dirt everyday.
• SNOW-BLINDNESS CATARACT :- High dose of UV-B causes inflammation of cornea.
• SOIL EROSION :- Removal of fertile top soil due to human activities over – cultivation, deforestation etc.
• WATER LOGGING :-The stagnation of water in the field due to irrigation without proper drainage of water.

CBSE Class 12 Biology - CBSE Class 12 Biology - Environmental Issues Study Guide

ASSIGNMENTS
LEVEL 1
1. Define eutrophication.
2. What is biomagnification?
3. What is BOD?
4.Which is the world‗s most problematic weed, also known as ―terror of Benga
5. Differentiate between biodegradable and non-biodegradable wastes.
6. Describe Chipko Movement.
7. Mention harmful effects of noise pollution on human health

LEVEL 2
1. What is meant by algal blooms? What is its significance?
2 What is Jhum cultivation?
3 What is snow blindness?
4. Mention the harm caused by fine particulate matter to human beings?
5.What are the advantages of Organic farming?
6. How do radioactive wastes cause damage to living organism?
7. What measures should be taken to reduce global warming?
8. Write a short note on ozone depletion.

LEVEL 3
1. What is the effect of DDT in birds?
2. Why are nuclear wastes called potent pollutants?
3. Mention two problems that have arisen due to green revolution.
4. What is ecological sanitation? What are its advantages?
5. How can we reduce automobile pollution?
6.Mention the adverse effects agrochemicals
7..Mention the Supreme Court directions to the Government to reduce pollution.
8. a) Explain the functioning of electrostatic precipitator with the help of a diagram.
b) Mention the consequence if the electrostatic precipitator does not work in a power plant.

QUESTIONS FOR SELF EVALUATION
1What do you mean by point source pollution ?
2What is the cause of minimata disease ? Write its symptoms .
3Which type of UV radiations can be lethal to the organisms ?
4 Expand the term PAN ?
5 Write constituents of smog ?

6BOD of two samples of water A and B were 120 mg./L and 400 mg./L .respectively .Which sample is
more polluted ?
7How do human activities cause deforestation ?
8 DISCUSS e –wastes.
9 Write a note on acid rain .
10 Discuss the causes and effects of global warming .

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Chapter 8 Human Health and Diseases
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Chapter 9 Strategies for Enhancement In Food Production
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Chapter 11 Biotechnology Principles and Processes
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Chapter 12 Biotechnology and Its Application
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Chapter 13 Organisms and Populations
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Chapter 14 Ecosystem
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Chapter 15 Biodiversity and Conservation
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Chapter 16 Environmental Issues
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