Of the ultraviolet radiation that reaches the Earth's surface, more than 95% is:
1. UV A
2. UV B
3. UV C
4. UV radiation reaching Earth has an equal percentage of UV A, UV B, and UV C
Identify the incorrectly matched pair:
1. |
Ozone depletion |
DNA damage |
2. |
Greenhouse effect |
Increased atmospheric carbon dioxide |
3. |
Acid rain |
pH < 5 |
4. |
Eutrophication |
Decreased primary productivity |
Ozone hole is:
1. | a partial gap in the stratospheric ozone layer over Antarctica |
2. | a partial gap in the stratospheric ozone layer over Arctic |
3. | thinning of ozone layers over polar regions |
4. | excessive buildup of lower troposphere ozone |
Match the items in column I and column II and choose the correct option:
Column I | Column II | ||
A. | UV | i. | Biomagnifications |
B. | Biodegradable organic matter | ii. | Eutrophication |
C. | DDT | iii. | Snow blindness |
D. | Phosphates | iv. | BOD |
Options: | A | B | C | D |
1. | ii | i | iv | iii |
2. | iii | ii | iv | i |
3. | iii | iv | i | ii |
4. | iii | i | iv | ii |
The common misconceptions regarding ozone depletion include:
I. | Since CFC molecules are heavier than air (nitrogen or oxygen), the CFC molecules cannot reach the stratosphere in a significant amount. |
II. | Natural sources of tropospheric chlorine are four to five times larger than man-made ones and are responsible for ozone depletion. |
III. | The ozone hole should be above the sources of CFCs. |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II, and III |
Consider the following statements:
1. | The “bad” ozone is the ozone that is formed in the troposphere. |
2. | The “good ozone” in the stratosphere acts as a shield against harmful UV radiation. |
3. | UV-A radiations can cause skin cancers and snow-blindness cataracts. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |