Match the following related to effect of UV rays on organisms? List I List II (i) UV Light (a) 320 - 380 mm (ii) UVC Light (b) 280 - 320 mm (iii) UVB Light (c) 100 - 280 mm (iv) UVA Light (d) 100 - 380 mm

(i-d), (ii-c), (iii-b) and (iv-a)

(i-d), (ii-a), (iii-b) and (iv-c)

(i-a), (ii-b), (iii-c) and (iv-d)

(i-fd), (ii-b), (iii-c) and (iv-a)

Dobson unit is used to measure the thickness or concentration of the ozone layer. It is used to measure the amount of ozone in a vertical column from the ground to the top of the Earth's atmosphere. It is equal to 2.69 10 16 molecules of ozone per square cm.

EASY

Earn 100

Which of the following statements above about ozone are not true?
a) Ozone is formed in the stratosphere.
b) Ozone is good in the troposphere and bad in the stratosphere.
c) Ozone depletion is maximum near poles.>

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Important Questions on Environmental Issues

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

Which of the following is not one of the prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers?

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

The unit which is used to measure the ozone is:

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

Which of the following statements are correct related to ozone depletion in the stratosphere?
(i) Ozone found in the upper part of the atmosphere that act as an efficient shield by absorbing UV rays from the Sun
(ii) DNA and proteins of living organisms could not absorb UV rays
(iii) Ozone gas is continuously formed by the action of UV rays on molecular oxygen
(iv) Ozone gas is more stable
(v) $Cl$ atoms are related from CFC by the action of UV rays, these $Cl$ atoms act as catalyst to degrade, ozone molecules

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

Montreal protocol was signed in 1987 for control of

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

In the stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?

EASY

Biology>Ecology>Environmental Issues>Ozone Depletion

Dobson units are used to measure thickness of:

HARD

Biology>Ecology>Environmental Issues>Ozone Depletion

Why does ozone hole form over Antarctica?