47. Which of the following can be threats to the biodiversity of a geographical area? 1. Global warming 2. Fragmentation of habitat 3. Invasion of alien species 4. Promotion of vegetarianism
Select the correct answer using the codes given below :
1, 2 and 3 only
2 and 3 only
1 and 4 only
1, 2, 3 and 4
12. Consider the following agricultural practices : 1. Contour bunding
2. Relay cropping 3. Zero tillage
In the context of global climate change, which of the above helps/help in carbon sequestration/storage in the soil?
1 and 2 only
3 only
1, 2 and 3
None of them
13. What would happen if phytoplankton of an ocean is completely destroyed for some reason? 1. The ocean as a carbon sink would be adversely affected. 2. The food chains in the ocean would be adversely affected. 3. The density of ocean water would drastically decrease.
2 only
14. Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to
the destruction of their nesting sites by new invasive species
a drug used by cattle owners for treating their diseased cattle
scarcity of food available to them
a widespread, persistent and fatal disease among them