Process of natural ageing of  lakes

    a) Biomagnification    b)Eutrophication          c)BOD                        d)Algal bloom

In a study conducted on the concentration of DDT  in water bodies it was found that concentration increases in the successive trophic levels.

a) Name the phenomenon.

b) How does DDT accumulation in water bodies  affect the population of  fish eating birds?  

Any undesirable change in physical, chemical or biological characteristics of air is called air pollution.
            a) Write any  two causes of air pollution.
            b) Expand CPCB.  

The Supreme Court ordered Delhi Government to make measures to switch over all the public transport to CNG operated one.
            a) Expand  CNG ?
            b) Give two advantages of CNG.

Human activities accelerate the aging process of  lakes.
a. Name the phenomenon.

b.Write any four consequences of the phenomenon identified above.

Various greenhouse gases contribute to global warming.
            a) List out any four gases involved in greenhouse effect?
            b)Define global warming.

Conversion of forests in to agricultural land is a major cause for deforestation.
a) Name the agricultural practice in which farmers cut down  trees of the forest and burn the plant remains.
b) Comment on deforestation and reforestation.

The Government.of India has instituted an award for individuals or communities from rural areas  who have shown extraordinary courage and dedication in protecting wildlife.

a) Write the name of  this award.

b) Name the people participation movement   in India for the protection of trees.  .

 Increase in the level of greenhouse gases has led to considerable heating of earth, leading to global warming. How can we control global warming?

Explain how noise adversely affect the normal life of humans.

In 1987 noise is declared as an air pollutant in India.

            a) How does noise affect human health?

            b) Suggest  measures to protect us from noise pollution.

Write any three measures to be enforced to protect ourselves from noise pollution.

Name a metal which acts as catalyst in catalytic converters, used in automobiles.

Observe the flow chart given below.

Name and explain the phenomenon illustrated here.

Observe the diagram given below.

a) Identify the instrument.

b) Mention its use.

Fill in the blank.

Increase in the concentration of toxic substances at successive trophic levels is called___________________.

Fill in the blank.

Presence of large amount of nutrients in water leads to excessive growth of planktonic organisms.This is known as ___________________.

Fill in the blank.

The device used to remove particulate matter present in the exhaust from a thermal power plant is ____________________.

Fill in the blank.

The thickness of ozone layer is measured in---------- units.

Name the following.

The layer of atmosphere  in which ozone layer is seen.