In the Sierra Nevada Mountains of California There Are Many

question 16

Multiple Choice

In the Sierra Nevada mountains of California there are many populations of the checkerspot butterfly Euphydryas editha. Females of each population lay their eggs on different regions of their host plants. The young hatch out as caterpillars; they live on the host plant and eat its leaves. The host plant used by population A grows over a single season, with new leaves (the most nutritious) appearing at the tip of the stem. The host plant of population B lives for many seasons, with new leaves appearing at the base of the stem. Where do you expect females from population B to lay their eggs?

• A)at the base of the plant stem
• B)at the tip of the plant stem
• C)anywhere along the plant stem
• D)in the middle of the plant stem

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