1. Burrowing animals and termites 

2. Fire

3. Grazing herbivores 

4. Seasonal rainfall

 5. Soil properties

 Select the correct answer using the codes given below

 a) 1 and 2

 b) 4 and 5

 c) 2, 3 and 4

d) 1, 3 and 5 

9. Ans: c

Explanation:

The vegetation of savanna characteristically consists of grassland with scattered small trees, but extensive areas have no trees. The trees actively grow only during the rainy season. In the absence of other controlling factors, these tropical areas would be expected to be covered by forest. But forest development is kept in check, in part by the limited moisture that limits their growth to the rainy season, but also by grazing and fire. 

Hence, option c is correct.

Read: Previous Year UPSC Geography Questions (PYQs) With Explanation 2021