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?<br/>1. Burrowing animals and termites<br/>2. Fire<br/>3. Grazing herbivores<br/>4. Seasonal rainfall<br/>5. Soil properties<br/><br/>Select the correct answer using the code given below.

1. Burrowing animals and termites — They can affect soils locally, but they are not generally cited as the main broad controls preventing forest development across savannahs. Verdict: Incorrect.

2. Fire — Frequent fires kill tree saplings and maintain grass dominance in savannah landscapes. Verdict: Correct.

3. Grazing herbivores — Heavy grazing/browsing suppresses woody regeneration and helps keep savannah open. Verdict: Correct.

4. Seasonal rainfall — Strong wet-dry seasonality limits continuous tree growth and favors grasses over closed forests. Verdict: Correct.

5. Soil properties — Soil can influence vegetation, but in this question the standard major checks on forest development in savannah are fire, grazing and seasonal rainfall. Verdict: Not taken as correct here.

Hence, the correct set is 2, 3 and 4.