Nutrient Cycling MCQs (Quiz 6)

1. Plants mainly absorb water and mineral ions from the soil through their _________________

2. Lichens contribute to weathering by ______________________

3. Which weathering process directly releases calcium and magnesium ions into soil solution, making them available for plant uptake?

4. Which of the following is NOT an agent of nitrogen fixation?

5. Which ecosystem acts as one of the largest natural carbon sinks on Earth?

6. The breakdown of rocks into soil particles is an important consequence of _____________

7. What is the correct sequence of products formed during nitrification?

8. Which type of weathering is most dominant in tropical rainforests?

9. When a plant absorbs nitrates from the soil and uses them to build proteins, this is an example of ____________

10. Burning fossil fuels releases large amounts of __________________ gas, directly contributing to the greenhouse effect and global warming