Mulching, an agronomic measure of soil- conservation, is very effective because it 1. protects soil from gully erosion 2. protects soil from sheetwash and wind erosion 3. helps soil to retain moisture and nutrients Select the correct answer using the code

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Q: 75 (NDA-I/2014)
Mulching, an agronomic measure of soil- conservation, is very effective because it
1. protects soil from gully erosion
2. protects soil from sheetwash and wind erosion
3. helps soil to retain moisture and nutrients
Select the correct answer using the code given below.

question_subject: 

Geography

question_exam: 

NDA-I

stats: 

0,63,140,11,17,44,131

keywords: 

{'mulching': [0, 0, 0, 1], 'soil': [7, 0, 4, 7], 'gully erosion': [0, 0, 1, 1], 'agronomic measure': [0, 0, 0, 1], 'wind erosion': [1, 0, 0, 3]}

The correct answer is option 4, which states that mulching is effective in protecting the soil from gully erosion, sheetwash and wind erosion, and also helps the soil retain moisture and nutrients. Let`s analyze each option to understand why they are incorrect or correct.

Option 1 states that mulching only protects the soil from gully erosion. This is incorrect because mulching provides a barrier that can prevent water from flowing in gullies, reducing erosion caused by gully formation. However, it also helps with other erosion types.

Option 2 states that mulching protects the soil from sheetwash and wind erosion only. This is also incorrect because, in addition to protecting against these two types of erosion, mulching also helps with moisture retention and nutrient preservation.

Option 3 states that mulching helps soil retain moisture and nutrients and protects from sheetwash and wind erosion. This is partially correct because it describes two of the benefits of mulching, but it leaves out the crucial protection against gully erosion.

Therefore, the correct answer is option 4, which includes all three benefits of mulching - protection against gully erosion, sheetwash and wind erosion, and moisture and nutrient retention.