CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 2 Marks Questions With Solution 2021
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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 2 Marks Questions With Solution 2021
12th Standard CBSE
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Reg.No. :
Biology
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How do religious beliefs help in the conservation of biodiversity?
(a) -
Why are grains and vegetables produced in organic farms supposed to be better for human consumption than those produced in farms where chemical fertilizers, pesticides etc. has been used?
(a) -
Why is organic farming considered more eco –friendly than agro-chemical farming?
(a) -
There are reports that the size of Arctic ice cap is decreasing every year.
a) What are its possible reasons?
b) How we the human beings are responsible to a greater extent for this?
c) How we can contribute to check this trend?(a) -
In a survey it is observed that the population of fish-eating birds living on the bank of lake is continuously declining, where DDT is regularly sprayed to check mosquitoes.
i) What could be the reason behind this?
ii) Name the phenomenon involved.(a) -
What in your opinion is more polluted and why – Domestic sewage or ndustrial effluents/waste from a agricultural field containing fertilizes and pesticides?
(a) -
Why was Eichhornia introduced into India? What is the consequence of its introduction?
(a) -
List some of the waste which is generated at home. Which of them can you avoid or reduce easily?
(a) -
Suppose your father is planning to set up a factory.
(i) What measures would you suggest to him to provide protection against noise pollution.
(ii) Mention two harmful effects of noise pollution(a) -
Is global warming real, only a theory or speculation?
(a)
2 Marks
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CBSE 12th Standard Biology Subject Environmental Issues HOT Questions 2 Marks Questions With Solution 2021 Answer Keys
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Some plants are considered sacred and propagated for the religious ceremonies. In some tribes, axe is not used because of the religious sanctity related to them. In some areas, temples are generally surrounded by deodar forests and protected by the people of that area.
A number of water bodies are also held sacred, e.g. Pushkar lake in Rajasthan. Their aquatic flora and fauna are protected from exploitation. -
Chemical fertilizers/pesticides --non -biodegradable, enter into food chain through vegetables/grains, causes biomagnification in humans. In organic farms manure is used, whose produce causes no harm to human health.
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Organic farming in which no use of chemicals like fertilizers and pesticides . It is a Zero- waste procedure where waste products of one process are cycled as nutrients for other processes.
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a) Global warming due to increase of green- house gases like CO2 , methane etc.
b) Excess use of fossil fuel, and deforestation
c) Reforestation, encouraging use of non-conventional energy sources. -
i) Increase in the level of DDT with each trophic level.
ii) Biomagnification. -
Wastes from agricultural field /& Industrial effluents, because they are non-Biodegradable and toxic.
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Introduced for their lovely flowers - have caused havoc by their excessive growth and causing blocks in our waterways.
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(a) polythene packets
(b) vegetable peels
(c) Dry cells, blades
(d) aluminium foils
(e) Pieces of glass etc. Polythene packets can be avoided by using cotton bags, jute bags etc.(or any other waste with reason) -
i) a) Planting trees around the factory.
b) Walls should be equipped with sound absorbent material.
c) Workers should be equipped with ear-muffs
ii) a) impairing hearing ability
b) b) Sleeplessness, increased heart beat. -
Global warming is real and has been with us for sometime, increasingly during the past two decades, but gradually for more than a hundred years. The reality of it is seen in direct temperature measurements and also in the melting of glaciers in low latitudes, permafrost decay in Alaska and the decrease in sea-ice cover in Arctic.
2 Marks
