Page 2 - 3- Home Assignment I (Obj & Subj)- Bio- geo chemical cycles-2

9 Which of the following would happen in the absence of greenhouse effect in the
atmosphere?
(a) Pollution will increase.
(b) The earth’s surface temperature will increase.
(c) The earth’s surface temperature remains the same.
(d) The depleted ozone layer will decrease the earth’s temperature.
10 Which of the following gas is responsible for causing green-house effect?
(a) Carbon dioxide
(b) Methane
(c) Nitrous oxide
(d) All the above

Subjective

1. Name the gases which cause greenhouse effect. 1 E
2. Which part of solar radiation is absorbed by ozone layer? 1 E
3. What is the role of respiration in oxygen cycle? 1 Av
4. State the role of atmosphere in climate control. 3 Av
5. Carbon dioxide is necessary for plants. Why do we consider it as a 3 D
pollutant?
6. What is ozone layer depletion? How it occurs? Where was it firstly 3 D
observed?