Which of the following sentences about greenhouse

12. It is a common observation that mushrooms thrive
few days after lightning strikes. Which among the
following biogeochemical cycles is involved in this
process?
a. Greenhouse gases trap heat in the atmosphere which
are returned to the earth’s surface.
14. Shown below is a simple food web in a grassy
community. The arrow symbol means eaten by. What
would happen if all snakes are killed?
d. Greenhouse effect increases the overall surface
temperature of the earth.
11. When a gardener propagates a plant by taking
cuttings, he plants his cutting in a well-watered soil in a
plant pot. What is the most likely reason why he may
then cover the plant and pot with a lightly perforated
polythene bag?
b. To decrease the rate of gaseous exchange by the
plant.
c. To reduce the chance of attack by pests.
d. To protect the plant from cold weather.
10. Which of the following sentences about greenhouse
effect is INCORRECT?
13. Which of the following factors contribute to an
increase in human population?
I. Immigration II. Emigration
III. Natality IV. Mortality