Which of the following is natural and human disturbance in ecology ?

(a)

Forest fire

(b)

Floods

(c)

Acid rain

(d)

Green house effect

Ozone depletion will cause ___________.

(a)

forest fires

(b)

eutrophication

(c)

bio magnification

(d)

global warming

Living in the atmosphere of CO is dangerous because it __________.

(a)

Combines with O₂ present inside to form CO₂

(b)

Reduces organic matter of tissues

(c)

Combines with haemoglobin and makes it incapable to absorb oxygen

(d)

Dries up the blood

Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be ______.

(a)

highly polluted

(b)

poor in dissolved oxygen

(c)

rich in dissolved oxygen

(d)

low COD

Assertion (A) : Excessive use of chlorinated pesticide causes soil and water pollution.
Reason (R) : Such pesticides are non-biodegradable.
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct

Which of the following is responsible for acid rain?

(a)

CO₂

(b)

NO₂

(c)

CO₂

(d)

All of these

High concentration of lead in human blood damages ______________

(a)

Brain

(b)

Liver

(c)

Both (a) & (b)

(d)

Neither (a) nor (b)

Which one of the followings affects chlorophyll ?

(a)

SO₃

(b)

SO₂

(c)

CO₂

(d)

NO₂

NO₂ and SO₂ have some properties in common. Which property shown by one of these compounds, but not by the other?

(a)

Forms acid

(b)

Is a reducing agent

(c)

Is soluble in water

(d)

is a it is used as a food-preservative

Statement I : Global warming is due to Green house effect.
Statement II : Green house gas is CH4

(a)

Both statement I and statement II are true and statement II explains statement I

(b)

Both statement I and statement II are true but statement II does not explain statement I

(c)

Statement I is true but statement II is false

(d)

Both statement I and II are false

Pick the viable pollutant among the following.

(a)

Smoke

(b)

Mould

(c)

Mist

(d)

Fumes

Which one of the following is not a property of classical smog?

(a)

Secondary pollutants play significant role

(b)

Occurs at low temperature

(c)

Contains SO₂

(d)

Dark brown coloured

Earth is protected from UV rays by ______________

(a)

N₂

(b)

O₂

(c)

SO₂

(d)

O₃

Statement I : Photochemical smog is also known as oxidizing smog.
Statement II : Photochemical smog .is chiefly composed of O₃, PAN, etc

(a)

Both statement I and statement II are true and statement II explains statement I

(b)

Both statement I and statement If are true but statement II does not explain statement I

(c)

Statement Lis true but statement II is false

(d)

Both statement I and II are false

Which causes water pollution?

(a)

Jet planes

(b)

Herbicides

(c)

Smoke

(d)

Combustion of fossils

Decomposition of organic matter through microbial activity is known as ____________

(a)

Eutrophication

(b)

Putrescibility

(c)

BOD

(d)

Stratification

Statement I : Value of COD is greater than BOD
Statement II : Used oxygen is demanded by: some chemicals for oxidation of I inorganic and organic pollutants.

(a)

Both statement I and statement II are true and statement II explains statement I

(b)

Both statement I and statement II are true but statement II does not explain statement t

(c)

Statement Iis true but statement II is false

(d)

Both statement Iand II are false

BOD values less than 5 ppm indicates a water sample to be _________

(a)

Poor in dissolved oxygen

(b)

rich in dissolved oxygen

(c)

Highly polluted

(d)

Not suitable for aquatic life

Which one of the following gases is not present in troposphere?

(a)

N₂O₂

(b)

CO₂

(c)

N₂

(d)

water vapours

Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog. Identify it.

(a)

NO₂

(b)

O₃

(c)

SO₂

(d)

Unsaturated hydrocarbons