Atmospheric levels of carbon dioxide have rapidly increased since the industrial revolution. One effect of increased atmospheric CO2 is global warming. What effect does increased CO2 have on plants?
A. plants may no longer need light for photosynthesis.
B. some crops such as tomatoes and cucumbers may experienced enhanced growth rates.
C. plants may be able to absorb carbon dioxide even with their stomata closed.
D. C4 photosynthesis may become more important than C3 photosynthesis.
B. some crops such as tomatoes and cucumbers may experienced enhanced growth rates.
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In green plants, which photosystem absorbs photons to excite electrons in the reaction center?
A. Photosystem I B. Photosystem II C. Photosystem III D. Photosystem I and II E. Photosystem I, II and III
After Darwin concluded his voyage on the Beagle, he proposed that the process of natural selection was a mechanism for:
A. overpopulation of finches on the Galapagos Islands. B. speciation. C. artificial selection. D. sexual selection. E. evolution.
____ is (are) the transport medium for blood
cells and platelets.
a. Pure water b. Plasma c. Lymph fluid d. Plasma and lymph fluid e. None of these
In a flowering plant life cycle, which of the following structures are diploid?
a. megaspores b. male gametophytes c. eggs d. sporophytes e. sperm cells