Which of the Following Could Qualify as a Top-Down Control

question 10

Multiple Choice

Which of the following could qualify as a top-down control on a grassland community?

• A) limitation of plant biomass by rainfall amount
• B) influence of temperature on competition among plants
• C) influence of soil nutrients on the abundance of grasses versus wildflowers
• D) effect of grazing intensity by bison on plant species diversity

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Definitions:

Helper T Cells

A type of white blood cell that plays a crucial role in the body's immune system by helping to activate other immune cells.

Phagocytosis

The cellular process of engulfing solid particles by a cell to form an internal vesicle known as a phagosome.

Antibodies

Proteins produced by the immune system to identify and neutralize foreign substances like bacteria and viruses.

Antigens

Substances that the immune system recognizes as foreign, triggering an immune response; often parts of pathogens like bacteria, viruses, or fungi.