Fill in the blanks :
Ozone depletion is mainly caused by the active………… atoms generated from CFC in the presence of UV radiation.

Fill in the blanks : Ozone layer prevents the harmful……………… radiation of the sun to reach the earth.

Fill in the blanks : Decrese of the concentreation of ozone in the stratosphere is the cause of formation of………. holes.

Read the following statements regarding the PAN (Peroxyacyl nitrates) and select the correct ones. (i) It is a secondary pollutant present in photochemical smog. (ii) It is produced by photochemical reactions between hydrocarbons and nitrogen oxides in the presence of sulight or UV radiations. (iii) It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. (iv) It is a lacrymatory substance, causing irritation of eyes.

A: Ozone depletion potential is maximum in CFC's. R: CFC looses active chlorine.

With the depletion of ozone layer more UV radiation filters into the troposphere. UV radiations lead to :

Freon gas causing stratospheric O_(3) depletion is mainly released from :

Fill in the blanks from the choices given in the brackets: The product of condensation of ethanoic acid with ethanol in presence of conc. H_2 SO_4 is _______ [acetaldehyde, ethylacetate, diethylether]

Assertion : Ozone is destroyed by CFCs in the upper stratosphere. Reason : Ozone holes increase the amount of UV radiation reaching the earth.

Fill in the blanks with appropriate words. (i) Resistance to the most plants is the ability to prevent the pathogen from causing disease and is determined by the "______" . (ii) Smooth leaved and "______" cotton vaneties do not attract bollworms. (iii) It has been possible to develop and iron fortified "______" variety containing over five times as much iron as commonly consumed verieties.

A : Environmental damage has depleted the ozone layer in the atmosphere. R : Increase in ozone decreases the amount of UV radiation to earth.