Refer to the Figure

question 62

Multiple Choice

Refer to the figure.
In the study illustrated in the figure, van der Heijden and colleagues compared the effects of differing numbers of mycorrhizal species (0?-14) on the same 15 plant species. They measured the effects of this mycorrhizal species diversity on net primary production (measured as shoot and root biomass) and on cycling of nutrients (measured as phosphorus content) . Based on the figure, what can be concluded about the effect of mycorrhizal diversity on plant ecosystems?

• A) All three factors decrease, indicating that mycorrhizal diversity inhibits plant growth.
• B) All three factors increase, indicating that mycorrhizal diversity improves plant growth.
• C) There appears to be little change in any of the three factors; thus, mycorrhizal diversity has little effect on plant growth.
• D) Shoot biomass and phosphorus content increase, but root biomass shows little change, indicating that the presence of mycorrhizae in soil depresses root growth.

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Definitions:

Epithelium

Layers of cells covering internal or external surfaces of the body, serving as a protective barrier and involved in processes such as absorption and secretion.

Epidermis

The outermost layer of skin that provides a waterproof barrier and creates our skin tone, serving as the body's primary defense against the environment.

Stratum Lucidum

Clear layer of the epidermis found in thick skin between the stratum granulosum and the stratum corneum.

Epidermis

The outermost layer of skin, providing a waterproof barrier and creating skin tone.