Question

Which of the following soil constituents is typically supplied by humus rather than regolith?

1) potassium (K)
2) calcium (Ca)
3) nitrogen (N)
4) magnesium (Mg)
5) iron (Fe)

Answer 1

Nitrogen (N) is the soil constituent typically supplied by humus rather than regolith, essential for plant's amino acids, proteins, and nucleic acids.

Step-by-step explanation:

The soil constituent typically supplied by humus rather than regolith is nitrogen (N). Humus is rich in organic matter and is crucial for providing nitrogen to plants, which is essential for plant growth as it is a major component of amino acids, proteins, and nucleic acids. Regolith, on the other hand, consists of weathered rock and mineral fragments that can supply other nutrients such as potassium, calcium, magnesium, and iron.