Regarding the sources of plant nutrients, which statement is correct?

1. A Option A: Air and water are the sources of oxygen, and the chief source of soil nitrogen is organic matter, which gives ammonia when it decomposes.
2. B Option B: The plant absorbs carbon as carbon dioxide directly from the atmosphere.
3. C Option C: Water is the source of hydrogen.
4. D Option D: All of the above

Answer checked 11 October 2026 · How we write and check questions