Explanation
Things become resources only when they have a value. “Its use or utility gives it a value. All resources have some value.”
Among the given options iron and cotton have an economic value. Man, when educated, has value. But the grass has no such direct value.
The state of Rajasthan is very well endowed with solar and wind energy but lacks in water resources.
Natural vegetation reflects the combined effects of relief and climate. The formation and development of soil is very much influenced by the growth of vegetation. The decayed leaf material adds much needed humus to soil thereby increasing its fertility.
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