Answer:
Yes, they can use it directly
Explanation:
Nitrogen is an important macronutrient needed by a wide variety of organisms including plants. However, nitrogen occurs/can be found in different compounds, which are mostly not directly usable by plants while some are directly usable.
According to this question, when an organism excretes waste, the nitrogen content of that waste is found as UREA. UREA is an organic compound rich in nitrogen which can be used directly by plants as fertilizer i.e. nitrogen source.
When an organism excretes waste, a plant can directly use it as fertilizer. Therefore, it's true.
It should be noted that nitrogen is an important macronutrient that's needed by several organisms including plants. It is vital for their growth.
Wastes from organisms are allowed on plants and these are vital for their growth. Therefore, in such a case, when an organism excretes waste, the nitrogen content of that waste can be found in the waste and this can be used as fertilizer for the plant.
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