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Recent questions tagged cbsc
Questions
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
A radiation causes ageing of skin, skin cancer, and inflammation of cornea called snow blindness. It also damages DNA. Name the radiation.
cbsc
class 12
biology
environmental issues
sec-a
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-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why was the Montreal Protocol signed?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
What is the noise level that can cause permanent impairment of hearing ability of human beings?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
PM2.5 is responsible for causing greatest harm to human health. What is it? How is it harmful?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why should the velocity of air between the plates of an electrostatic precipitator be low?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
The central pollution control board observed that a thermal power plant is emitting 80% of its particulate matter in the exhaust due to poor maintenance? What could be the cause for this increase in % of particular matter?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why is a scrubber used? Which spray is used on exhaust gases passing through a scrubber?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Motor vehicles with catalytic converter should use unleaded petrol. Why?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
The birds egg shells become thinner in an area where there is an excess application of pesticides. Comment.
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Mention the information that the health workers derive by measuring BOD of a water body.
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
Why should the velocity of air between the plates of an electrostatic precipitator be low?
cbsc
class 12
biology
environmental issues
sec-a
asked
Apr 11, 2019
by
priyanka.clay6
1
answer
What is hydrarch?
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What is xeroarch?
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Give an account of energy flow in an ecosystem.
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Describe the major components of ecosystems.
cbsc
class 12
biology
ecosystem
sec-d
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
In general all pyramids are upright. Explain. What are the exceptions to this generalization?
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Justify the statement succession and evolution would have been parallel processes at that time when life started on earth.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Describe pond as an ecosystem
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
What are ecological pyramids? Mention its limitations.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Give account of factors affecting the rate of decomposition.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Detrivores like earthworm are involved in the process of decomposition of dead plants and animals. Describe the different steps involved in the process of decomposition.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Ecosystems should carry a hefty price tag for its various services. Enlist six of them.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 2019
by
priyanka.clay6
1
answer
Both carbon and phosphorus cycles are biogeochemical cycles but they differ in three aspects. List them.
cbsc
class 12
biology
ecosystem
sec-c
asked
Apr 10, 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
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