Pockets of Open Space in Soil Are Necessary for Plant

question 65

Multiple Choice

Pockets of open space in soil are necessary for plant health. If these pockets are too large, however, plant health suffers. Why?

• A)Large open pockets of air fill with carbon dioxide, which lowers the pH of the soil to unhealthy levels.
• B)When a root encounters a large pocket of air it is less able to absorb the nutrients it needs because it is no longer in contact with the soil.
• C)When a large pocket of air collapses it hits the root damaging it and making it more susceptible to infection.
• D)Water is not retained well by large open spaces in the soil, which means that plant nutrients are readily leached from the soil.

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Definitions:

Macrophages

A type of white blood cell part of the immune system, responsible for detecting, engulfing, and destroying pathogens and dead cells.

Null Cells

Lymphocytes that lack surface markers distinctive of T or B cells, often associated with natural killer cell activity.

Variable Regions

Parts of antibodies that differ from one antibody to another, enabling them to bind to a specific antigen.

T-cell Receptors

These receptors on the surface of T-cells recognize and bind to antigens presented by other cells, initiating an immune response.