Loading...
UPSC 2013: Which of the following adds/add nitrogen to the soil? 1. Excretion of urea by animals 2. Burning of coal by man 3. Death of vegetation Select the correct answer using the codes given below.
(a)1 only
(b)2 and 3 only
(c)1 and 3 only
(d)1, 2 and 3
Attempt This Question
Not attemptedCorrect Answer: (c) 1 and 3 only
Nitrogen enters soil when animals excrete urea (which soil microbes hydrolyse to ammonia and then nitrates) and when vegetation dies and decomposes, returning organic nitrogen to the soil. Burning coal emits mainly CO₂, SO₂ and particulates; it does not directly contribute bioavailable nitrogen to soils, so statement 2 is incorrect. Thus statements 1 and 3 only are correct (option c). ([edukemy.com](https://edukemy.com/blog/upsc-prelims-2013-question-84/?utm_source=openai))
Related Current Affairs
Related UPSC Questions
More from Biogeochemical Cycles & Earth Systems
2014moderate
Which of the following adds/add carbon dioxide to the carbon cycle on the planet Earth? 1. Volcanic action 2. Respiration 3. Photosynthesis 4. Decay o
2011moderate
Human activities in the recent past have caused the increased concentration of carbon dioxide in the atmosphere, but a lot of it does not remain in th
2011easy
Consider the following : 1. Photosynthesis 2. Respiration 3. Decay of organic matter 4. Volcanic action Which of the above add carbon dioxide to the c
Related Environment & Ecology Topics
2013Water & Wetland Conservation
Which of the following can be found as pollutants in the drinking water in some parts of India? 1. Arsenic 2. Sorbitol 3. Fluoride 4. Formaldehyde 5.
2013Protected Areas & Wildlife
Consider the following pairs: 1. Nokrek Biosphere Reserve : Garo Hills 2. Loktak Lake : Barail Range 3. Namdapha National Park : Dafl
Frequently Asked Questions
What is the correct answer to this UPSC 2013 Environment & Ecology question?▼
The correct answer is option (c): 1 and 3 only. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biogeochemical Cycles & Earth Systems question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2013, GS Paper 1, as Question 34. It falls under Environment & Ecology > Biogeochemical Cycles & Earth Systems.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Biogeochemical Cycles & Earth Systems?▼
UPSC has asked 8 questions from Biogeochemical Cycles & Earth Systems (under Environment & Ecology) across multiple years. Visit the topic page to see the full list and year-wise trends.