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

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Q: (IAS/2021)
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 termites
2. Fire
3. Grazing herbivores
4. Seasonal rainfall
5. Soil properties
Select the correct answer using the code given below.
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question_subject: 

Geography

question_exam: 

IAS

stats: 

0,106,41,8,8,106,25

keywords: 

{'vegetation': [1, 0, 2, 1], 'grassland': [1, 0, 0, 0], 'forest development': [0, 0, 0, 1], 'soil properties': [0, 0, 0, 1], 'grazing herbivores': [0, 0, 0, 1], 'savannah': [2, 0, 0, 3], 'small trees': [0, 0, 1, 1], 'trees': [1, 0, 0, 0], 'conditions': [0, 0, 0, 1], 'such conditions': [0, 0, 0, 1], 'termites': [0, 0, 0, 1], 'extensive areas': [1, 0, 0, 1], 'seasonal rainfall': [0, 0, 0, 1], 'such areas': [0, 0, 0, 3], 'burrowing animals': [0, 0, 0, 1]}