Which of the Following Statements About Minerals in Soil Is

question 41

Multiple Choice

Which of the following statements about minerals in soil is true?

• A) There are only two mineral ions, potassium and magnesium, that are essential for plant growth.
• B) Negatively charged mineral ions are often washed out of the root zone.
• C) Clay minerals are usually positively charged.
• D) Clay minerals very rarely have charged ions
• E) Clay particles may "hold" mineral ions in the soil and prevent their use by plants.

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Definitions:

Macrophages

A type of phagocytic cell found in the liver, spleen, lungs, bone marrow, and connective tissue. Macrophages play several roles in humoral and cell-mediated immunity, including presenting the antigens to the lymphocytes involved in these defenses; also known as monocytes while in the bloodstream.

Hepatocytes

The cells within the lobules of the liver. Hepatocytes process nutrients in the blood and make bile.

Pepsinogen

An inactive precursor of pepsin, an enzyme produced in the stomach that plays a crucial role in the digestive process by breaking down proteins.

Pepsin

An enzyme that allows the body to digest proteins.