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Recent questions tagged sec-b
Questions
India in last two decades has seen a boom in automobile production and use. <br> (a) What has been its environmental impact ? <br> (b) What steps are being taken so that the rapid increase in the number of automobiles does not become a curse?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Dumping waste in landfills is not a real solution for disposing wastes. Why?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 13, 2019
by
priyanka.clay6
1
answer
Identify the wrong pair/s and correct it. <br> a) Chernobyl incident - Radioactive waste. <br> b) Snow blindness cataract - High dose of CFC. <br> c) Chipko movement - Save trees. <br> d) Polyblend - Solves air pollution. <br>
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
In the above graph what does A and B depict?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
CFCs are widely used as refrigerants. Then why is it suggested to reduce its emission a far as possible? Explain.
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
A farmer saw water in a pond turned green and with dead fishes. <br> a) What is the reason for the death of fishes? <br> b) Name the phenomenon that leads to the death of fishes.
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Mention the green house gases and their proportion in the pie diagram given below.
cbsc
class
12
biology
environmental
issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
A person has inhaled air having particulate pollutants of size less than 2.5 micrometers in diameter. What could be the impact of their pollutants on his respiratory system?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
A man had a B. class Benz which has a very good catalytic converter. On his way the petrol was exhausted and he stopped at a petrol pump. The person at the petrol pump had only leaded petrol. Out of necessity the man had to fill leaded petrol in his car. <br> a) What is its impact on the catalytic activity of the converter ? <br> b) Explain the impact on the environment.
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
It was observed that some of the aquatic birds’ population has been declining. On analysis of the water in their habitat, high concentration of DDT was found. <br> a) What caused the decline is birds’ population? <br> b) What is this phenomenon known as?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Vehicles are fitted with catalytic converters. Give reason.
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Electrostatic precipitator can remove over 99% particulate matter present in exhaust from a thermal power plant. How?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Jhum cultivation has been in practice from earlier days, but its considered more problematic these days. Why?
cbsc
class 12
biology
environmental issues
sec-b
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Schematically show the flow of energy in a grazing food chain from the sun.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why is there a restriction on trophic levels in a grazing food chain? Is there such a limitation in the detritus food chain? Explain.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What characteristic features are seen in Ecological succession?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Define ecological succession. What is sere ?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
As succession proceeds the type and number of animals and decomposers also change.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Name the pioneers and climax of primary succession in water and on rocks.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why is secondary succession faster than primary succession?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is the importance of humus?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Define standing crop? How is it measured?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why Phosphorus cycle is called an imperfect cycle, while Carbon and Nitrogen cycle are perfect ?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention two factors by which productivity is limited in an aquatic ecosystem.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are the differences between detritus and grazing food chains?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why is the length of a food chain in an ecosystem generally limited to 3-4 trophic levels?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Gaseous nutrient cycle and sedimentary nutrient cycles have their reservoir. Name them. Why is a reservoir necessary?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Differentiate between primary succession and secondary succession.Which one occurs faster?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Give an example of an ecological pyramid which is always upright. Justify your answer.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Given below is a simplified model of phosphorus cycle. Write down the natural reservoir of phosphorus and also the processes that put in phosphorus to the soil.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Given below is the primary hydrarch succession. Bring out the missing sere stages in the process.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are the limitations of ecological pyramids?
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is the effect on decomposition rate if :
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Give an example of an ecological pyramid which is always upright. Justify your answer.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
"Decomposition is an oxygen requiring process" comment.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
"Flow of energy is unidirectional but nutrient flow is in a cycle". Give reason.
cbsc
class 12
biology
ecosystem
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
How can you make a bacterial cell competent to take up foreign DNA ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is insertional inactivation?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the role of selectable marker in cloning vector with an example.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are “sticky end” and “blind ends” ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is a palindromic sequence? Give example.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention one basic difference between restriction endonucleases and exonucleases.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why do bacteria possesses restriction enzyme ?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Mention the three steps involve in genetically modifying an organism.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is gene cloning?
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Enlist the core techniques that pave the way for modern biotechnology.
cbsc
class 12
biology
biotechnology : principles and process
sec-b
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Why do we still search for other alternatives to increase food production?
cbsc
class 12
biology
biodiversity and its applications
sec-b
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
What are the functions of enzymes isolated by Stewart Linn and Werner Arber?
cbsc
class 12
biology
biodiversity and its applications
sec-b
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Differentiate ‘Cry’ and ‘cry’
cbsc
class 12
biology
biodiversity and its applications
sec-b
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
Give one word for the following:- <br>a. RNAi <br>b. Preventing mRNA translation <br> c. Mobile genetic element <br> d. Sequence of base pairs that needs same on the 2 strands
cbsc
class 12
biology
biodiversity and its applications
sec-b
asked
Apr 9, 2019
by
priyanka.clay6
1
answer
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