You are a forester for the Wisconsin Department of Natural Resources and have been sent to Costa Rica to help treat a fungal disease that is killing many trees. Part of your data collection includes the aging of trees that have been killed by the fungus. Explain why the methods for aging trees in Wisconsin may not work well in Costa Rica
What will be an ideal response?
Tree rings result from different seasonal growth patterns. For example, more robust growth in spring and summer results in larger xylem cells, slower growth in fall results in smaller cells. This size difference results in a growth ring. In the tropics (Costa Rica) growth can be more constant, thus resulting in less obvious rings. Therefore you may not get accurate data.
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"Z lines" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
If motility is considered a characteristic of animals, then why are stationary creatures such as sponges still considered to be animals?
What will be an ideal response?
Gibberellin induces ____
a. plants to bend toward the light b. cell division in meristems c. hydrolysis of starch in seeds d. fruits to ripen e. more than one of these to occur
Most birds are ____; most mammals are ____
a. socially monogamous; not socially monogamous b. socially monogamous; socially monogamous c. not socially monogamous; not socially monogamous d. not socially monogamous; socially monogamous e. not socially monogamous; promiscuous