If there was no green house effect:
1. | Earth would have been too cold for many organisms to survive |
2. | The diversity on Earth would have been much higher |
3. | The primary productivity would have been much higher |
4. | Earth would not have any atmosphere |
In India, the name Ramesh Chandra Dagar, is associated with:
1. Organic farming
2. Conservation of forests
3. Recycling of plastic wastes
4. Preservation of water lands
Consider the following statements:
I: | Freshwater algal blooms, the result of an excess of nutrients [particularly phosphates] cause large scale fish mortality. |
II: | Algae grow very quickly under high nutrient availability, but each alga is short-lived, and the result is a high concentration of dead organic matter, the decay of which consumes dissolved oxygen in the water, resulting in hypoxic conditions. |
1. Both I and II are correct and II explains I
2. Both I and II are correct but II does not explain I
3. I is correct and II is incorrect
4. Both I and II are correct
Burying radioactive wastes is not acceptable to many people as:
1. there is a risk of groundwater contamination
2. it may explode
3. it will harm the buried dead bodies
4. it may get accumulated in vegetations
Ozone hole develops over Antarctica each year between:
1. Early January and late April
2. Early March and late July
3. Late August and early October
4. Late September and early December
Sherwood Rowland and Mario Molina were awarded Nobel Prize in Chemistry in 1995 for their contribution to the study of:
1. Impact of air pollution on human health
2. Ozone depletion
3. Global warming
4. Deforestation and its global impact
Assertion (A): | Soil erosion rate increases due to deforestation. |
Reason (R): | Deforestation decreases the amount of litter cover, which provides protection from surface runoff. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Ozone hole over Antarctica develops each year between late August and early October. |
Reason (R): | Ozone depletion occurs within the polar vortex. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Most of the longer-wavelength UV-C radiation reaches the surface of the earth. |
Reason (R): | Ozone is transparent to most UV-C. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
Assertion (A): | Greenhouse effect is harmful to life on earth. |
Reason (R): | It leads to increased risk in human beings for the development of certain cancers. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |