The vegetation of savannah consists of grassland with scattered small trees, but extensive areas have no trees. The forest development in such areas is generally kept in check by one or more or a combination of some conditions. Which of the following are such conditions?1.Burrowing animals and termites2.Fire3.Grazing herbivores4.Seasonal rainfall5.Soil propertiesSelect the correct answer using the code given below

1. A

   1 and 2

   1 and 2. Termites/burrowers are not the keyed forest-check.

2. B

   4 and 5

   4 and 5. Soil alone is under-count; fire and grazers matter.

3. C

   2, 3 and 4

   2, 3 and 4. Fire, grazing herbivores and a strong dry season keep trees scattered. Burrowers and a generic ‘soil properties’ are not the trio.

4. D

   1, 3 and 5

   1, 3 and 5. Drops fire and rainfall seasonality.

Summary. Official key is (c) 2, 3 and 4. Savanna stays open because of fire, grazing and seasonal rain. Termites and a blanket soil clause are not the keyed checks.