Sunlight resets biological clocks in plants by activating and inactivating photoreceptors called ________
a. statoliths
b. jasmonates
c. phytochromes
d. phototropin
c
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What tissue is found within a leaf vein?
a. xylem b. cortex c. pith d. stomata e. epidermis
The size of the motor area in the brain for any specific body part is relative to:
a. the rest of the body. b. its position in the body. c. the complexity of its movements. d. the number of muscles it contains. e. the area of the brain that controls it.
Gastrulation is the process by which an embryo becomes three-layered
____________________ Indicate whether the statement is true or false.
The striking dissimilarities in plant communities among different biomes that have the same average yearly amount of rainfall can be explained by the fact that
A) plant communities are influenced more by the acidity of rain than by the amount of rainfall. B) plant communities are not influenced by rainfall. C) plant communities occur randomly, depending on where seeds are blown or carried. D) plant communities evolve more slowly than changes in weather patterns. E) temperature and rainfall interact to influence plant communities.