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

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

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

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.

Decomposition of organic matter through microbial activity is known as ____________

Which causes water pollution?

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

Earth is protected from UV rays by ______________

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

Pick the viable pollutant among the following.

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

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

Which one of the followings affects chlorophyll ?

High concentration of lead in human blood damages ______________

Which of the following is responsible for acid rain?

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

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

Ozone depletion will cause ___________.

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

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