Pollution, Climate Change and Conservation - Ecology and Environment - Life Sciences Previous Year Questions

1

2007 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2007

A bi remedial solution to reduce oxides of nitrogen and carbon in flue gases is to integrate flue gas emission to

A

micro-algal culture

B

fish culture

C

mushroom culture

D

seri culture

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2

2008 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2008

Which of the following statements are true on phytoremediation point of view ? P An effective technology that uses plants to tolerate and accumulate metals from the environment Q Detoxification of soil phenolic pollutants by plant secretory enzymes R Using RT-PCR to quantify gene expression in plants S Studies on plant phylogeny and exploiting the biodiversity

A

P, Q

B

P, R

C

R, S

D

P, S

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3

2008 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2008

Which of the following statements are true on ecological point of view?
P   Biodiversity is affected by environmental pollution
Q   Alternative agriculture is designed to sustain crop yield while enhancing inputs of fossil fuel, pesticides, etc.
R   Global climate change is caused by human activities
S   Acid rain is caused by excessive CO₂ in the air

A

P, Q

B

P, R

C

Q, R

D

R, S

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4

2009 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2009

Kyoto Protocol is related to

A

Acid rain

B

Photochemical smog

C

Ozone hole

D

Global warming

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5

2009 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2009

Increase in the emission of fossil fuels is thought to result in global warming. This is possible because an increase in atmospheric CO₂ level would

A

Increase the amount of sun light entering the earth atmosphere

B

Increase the amount of infrared radiation entering the earth

C

Absorb the infrared radiation reflected by the earth

D

Insulate earth from cold breeze coming from the space

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6

2010 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2010

Choose the most appropriate word from the options given below to complete the following sentence:
If we manage to ________ our natural resources, we would leave a better planet for our children.

A

uphold

B

restrain

C

cherish

D

conserve

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7

2011 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2011

The term biological magnification refers to the increased levels of a toxin seen in successive trophic levels in a food web. Which one of the following options correctly states the reason(s) for the increment of a toxin in the ecosystem?

A

The toxin is highly toxic to primary producers, relatively less toxic to primary consumers, and non-toxic to secondary consumers. Thus, a higher level of toxin is seen in species representing higher trophic levels

B

The toxin cannot be degraded by microorganism and consequently persist in the environment for years

C

The toxin to begin with was not toxic or less toxic, but became more toxic by metabolism in the primary producers

D

Both (B) and (C)

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8

2012 · Life Sciences · Ecology and Environment · Pollution, Climate Change and Conservation

Life Sciences (XL) 2012

Carbon dioxide and other ‘greenhouse gases’ act by

A

destroying ozone in the stratosphere

B

trapping heat in the earth’s atmosphere

C

allowing more visible light to reach the earth’s surface

D

reducing the amount of radiant energy which reaches the surface of the earth

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